CA1197659A - High temperature chimney - Google Patents
High temperature chimneyInfo
- Publication number
- CA1197659A CA1197659A CA000435533A CA435533A CA1197659A CA 1197659 A CA1197659 A CA 1197659A CA 000435533 A CA000435533 A CA 000435533A CA 435533 A CA435533 A CA 435533A CA 1197659 A CA1197659 A CA 1197659A
- Authority
- CA
- Canada
- Prior art keywords
- chimney
- chimney section
- section
- flue
- liner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F17/00—Vertical ducts; Channels, e.g. for drainage
- E04F17/02—Vertical ducts; Channels, e.g. for drainage for carrying away waste gases, e.g. flue gases; Building elements specially designed therefor, e.g. shaped bricks or sets thereof
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chimneys And Flues (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention relates to a high performance chimney for use on wood burning stoves and the like. The chimney comprises a chimney wall defining a flue gas conduit and consisting of a flue liner, an exterior wall cover and insulating material between the flue liner and the exterior cover. The flue liner is adapted to reduce radial distortion through longitudinal expansion when subjected to extreme exhaust temperatures.
The present invention relates to a high performance chimney for use on wood burning stoves and the like. The chimney comprises a chimney wall defining a flue gas conduit and consisting of a flue liner, an exterior wall cover and insulating material between the flue liner and the exterior cover. The flue liner is adapted to reduce radial distortion through longitudinal expansion when subjected to extreme exhaust temperatures.
Description
sg The present lnvention relates to a high performance chimney generally made from a plurality of interlocking chimney sections for use on solid fuel burning stoves, fireplaces and the l;ke, capable of producing extremely high exhaust temperatures.
BACKGROUND OF THE INVENTION
Over the last few years there has been a substantial increase in the popularity of solid fuel burning stoves and the like. A typical example is for use in cottages where the stDves provide both heat to the cottage and a surface for the cooking of food. In other cases, these units are being used in family rooms and the like where they both have functional and decorative features.
These solid fuel burning appliances are capable of producing extremely high exhaust temperatures. For example, with the burning of either wood or coal it is not uncommon to produce a creosote fire directly within the exhaust flue of a solid fuel burning stove. These creosote fires which may burn at temperatures in excess of ~000 degrees fahrenheit are extremely hard on conventional exhaust flues due to the distortion caused by the high temperature within the flue which generally tends to buckle inwardly into the flue opening as a result of expansion caused by the extreme heating. From a safety standpoint this can be a severe drawback in that it restricts the opening through the exhaust flue and inhibits proper exhausting of the glue gases.
1 A further consideration and concern is the overall diameter of the exhaust flue. Typically conventional exhaust flues for use on solld fuel burning stoves have a Hall thickness of up to three inches which in combination with a flue bore of for example eight inches, produces an overall diameter of fourteen inches. This large diameter makes the installation of the exhaust extremely awkward through a wall or a ceiling where the supports are typically spaced about sixteen inches from one another having little room for clearance to either side of the exhaust. In fact according to some testing specifications of these high temperature chimneys there should be a two inch clearance between the chimney and any wooden surfaces through which the chimney extends.
Accordingly a conventional chimney having an outside diameter of fourteen inches is not generally acceptable for fitting through wooden supports spaced sixteen inches from one another. Furthermore with conventional insulated chimneys it is not merely a case of reducing the thickness of the wall since the insulating ma-terial presently available is not capable of providing adequate insulating properties when reduced in thickness.
SUMMARY OF THE PRESENT INVENTION
The present invention provides a high performance chimney which is generally made from chimney sections with each section being adapted to withstand extreme exhaust temperatures typical of those found on solid fuel burning stoves and the like. Each chimney section has a chimney wall defining a flue gas conduit, with the chimney wall consisting of an inner metallic flue liner, ~9'76~9 1 an exterior wall cover and insulating material between the flue liner and the exterior wall cover. According to the present invention the flue liner is provided with a first end which is located by guide means having a stop surface for receiving the first end of the flue liner with the guide means being deformable to allow clearance of the first end past the stop surface of the guide means as the chimney section is heated. This enables longitudinal expansion for reducing radial distortion of the flue liner when it is subjected to the extreme exhaust temperatures.
According to a preferred embodiment of the present invention the chimney section is insulated with a solid pack insulation comprising a mixture of silica and an expanded rock particle. With this particular insulation the wall has a thickness of about one to two inches to substantially reduce the overall diameter of the chimney section relative to conventional chimneys.
BRIEF DISCUSSION OF THE DRAWINGS
The above as well as other advantages and features of the present invention will be described in greater detail according to the preferred embodiments of the present invention in which:
Figure 1 is a perspective view looking down on a section of a high performance chimney according to a preferred embodiment of the present invention;
Figure 2 is a top view of the chimney section shown in Figure l;
Figure 3 is a sectional view of the chimney section shown in Figure l;
~3~'76~9 1 Figure 4 is an enlarged sectional view of the chimney wall region of two unheated coupled chimney sections according a preferred embodiment of the present invention;
Figure 5 is a view similar to Figure 4 with the chimney sections being heated; and Figure 6 is a further enlarged sectional view through the wall of two coupled chimney sections when unheated.
DETAILED DESCRIPTION ACCORDING TO THE PREFERRED EMBODIMENTS
Figure 1 shows a chimney section generally indicated at 1. This chimney section is one which can be coupled with other similar chimney sections for forming an entire chimney for a wood or coal burning stove, a fireplace, gas or oil heating appliances or any other type of device having a heated exhaust. Although the chimney section can easily be used with exhaust oF relatively low temperature it is specifically adapted to withstand extremely high exhaust temperatures. In fact, according to United States UL 103HT and Canadian ULC S629 testing requirements a chimney constructed from a plurality of these chimney sections must be capable of withstanding rigorous testing at various extreme exhaust -temperatures for different durations without substantial internal distortion.
Chimney section 1 which has a male end 3 and a female end 5 for coupling with other like chimney sections as well as other chimney fittings such as T and elbow fittings and comprises a chimney wall generally indicated at 9 in Figure 3. The chimney wall defines a i ~976S9 1 central flue gas conduit 7 of for example six, seven or eight inches depending upon the particular application for which it is used.
Chimney wall 9 comprises an inner flue liner 11, an outer wall cover 15 and insulating material 13 sandwiched between the flue liner and the outer wall cover Both the flue liner and the wall cover are constructed of metallic material, preferably stainless steel. Flue liner 11 has a thickness in the range of eighteen to twenty four thousandths of an inch to make the liner structurally stable while keeping the weight of the liner at a reasonable level.
One of the main concerns with respect to prior art structures is the maintaining of the structural integrity of the flue liner as it is heated, particularly when temperatures rise as high as those encountered in the test specifications mentioned above. The problem arises due to the expansion of the flue liner under severe heating and in accordance with conventional practice the flue liner tends to buckle inwardly into the flue opening causing substantial distortion within the chimney section and choking off the exhaust opening through the chimney.
The chimney section of the present invention is specifically adapted to substantially overcome this difficulty through the method of mounting the liner within the chimney section.
ore specifically liner 11 is mounted in a manner to allow its longitudinal expansion upon heating which substantially reduces radial distortion which might otherwise occur. The liner includes a first end lla at ~1~7~i59 1 the male side of the chimney section and a second end llb at the female side of the chimney section. End lla is used for locating the liner in position while as best seen in Figure 3, end llb is substantially free within the chimney section. Also provided at the male end of the chimney section is a chimney section cap 17 having an axially projecting skirt portion 19. This skirt portion terminates in a stepped region 21 interiorly of the flue liner with this stepped portion providing a stop surface for locating end lla within the chimney section during assembly as shown in Figure 4. This located position of the flue liner is maintained by a frictional engagement between stepped portion 21 and end lla of the flue liner.
As the chimney section is heated all of the metallic components have a tendency to graw due to thermal expansion. This causes the skirt portion 19 to move radially outwardly as it is heated and since the skirt portion is secured at its upper end and free at its lower end it expands outwardly by an increasing amount from the secured to the free or stepped end of the skirt portion as best seen in Figure 5. As the free end of the skirt portion deflects outwardly it has a tendency to push outwardly on end lla of the flue liner and at the same time to angle the stop surface of the stepped portion relative to the end of the flue liner. This provides a cam effect which allows previously located end lla to clear past the stop surface and expand longitudinally of the chimney section as shown in Figure 5 whole it is also expanding radially to further clear past the stop surface. At the same time end llb of the flue liner is 1 allowed to move longitudinally of the flue liner due to its substan-tially free floating within the chimney section. Since the overall liner is allowed -to expand leng-thwise there is very li-ttle -tendency to buckle inwardly thereby substantially reducing radial distortion of the flue liner.
In the event that the liner should become dislodged within the chimney section a retaining ring 25 is provided at the female end of the chimney section. This retaining ring includes an inwardly extending shoulder 29 which is normally Free of end llb of the flue liner and if necessary is adapted to engage a bead 12 running around the flue liner as shown in Figure 3 should the liner be released within the chimney section. For purposes of easing the fitting of the retaining ring over the flue liner end llb of the liner is fluted which provides increased clearance between the flue liner and the flange portion of the retaining ring.
For purposes of coupling similar chimney sections to one another, as shown in Figure 6, cap 17 at the male end of the chimney section is provided with a plurality of teeth 23 around its outer edge while retaining ring 25 is provided with a plurality of teeth 27 on its inner surface. The cooperation of teeth 27 on the female end of one chimney section with -teeth 23 of the male end of a second chimney section provides a bayonette type locking ac-tion between the two chimney sections as best seen in Figure 6 of the drawings.
7~;S5~
1 It will be noted that the insulating ma-terial within the chimney wall extends comple-tely to the male end of each chimney section. Therefore when two or more chimney sections are coupled with one another there is a continuous wall of insulation material along the entire length of the chimney even though the female end of each section is uninsulated.
Referring in more detail to the chimney wall, it has been found in the past that when using most conventional insulating materials a wall thickness of over two inches has been required to properly insulate a chimney in order to pass the United States and Canadian test specifications. Accordingly where the chimney has a flue conduit size of eight inches and a wall thickness in excess of two inches, the outside diameter of the chimney is something over twelve inches. However, according to the above tests, a specified clearance of typically two inches should be provided around the entire chimney which means that a chimney of an outside diameter of more than twelve inches should not be fitted through a building with supports spaced sixteen inches from one another as is the case with most buildings.
According to the present invention the wall can be reduced in thickness to two inches to pass Canadian requirements and to about one inch to pass Unlted States requirements, which are less strict, due -to the construction of the chimney including a solid pack insulation comprising a mixture of silica and expanded rock particle. The weight of the insula-tion keeps each chimney section, which may for example come in lengths of ?$
~9~6sg 1 about three feet, within a very reasonable weight range for purposes of do-it-yourself installations.
It will now be seen from the above that the chimney section of the present invention is one which is specifically adapted for use on devices producing a heated exhaust with each chimney section of the overall chimney being adapted to withstand extremely high temperatures while remaining relatively free of distortions within the chimney. Furthermore a chimney which is constructed with chimney sections of the present invention is one which has reduced overall diameter relative to conventional chimneys and is therefore suitable for installation in a standardized building construction.
Although various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
BACKGROUND OF THE INVENTION
Over the last few years there has been a substantial increase in the popularity of solid fuel burning stoves and the like. A typical example is for use in cottages where the stDves provide both heat to the cottage and a surface for the cooking of food. In other cases, these units are being used in family rooms and the like where they both have functional and decorative features.
These solid fuel burning appliances are capable of producing extremely high exhaust temperatures. For example, with the burning of either wood or coal it is not uncommon to produce a creosote fire directly within the exhaust flue of a solid fuel burning stove. These creosote fires which may burn at temperatures in excess of ~000 degrees fahrenheit are extremely hard on conventional exhaust flues due to the distortion caused by the high temperature within the flue which generally tends to buckle inwardly into the flue opening as a result of expansion caused by the extreme heating. From a safety standpoint this can be a severe drawback in that it restricts the opening through the exhaust flue and inhibits proper exhausting of the glue gases.
1 A further consideration and concern is the overall diameter of the exhaust flue. Typically conventional exhaust flues for use on solld fuel burning stoves have a Hall thickness of up to three inches which in combination with a flue bore of for example eight inches, produces an overall diameter of fourteen inches. This large diameter makes the installation of the exhaust extremely awkward through a wall or a ceiling where the supports are typically spaced about sixteen inches from one another having little room for clearance to either side of the exhaust. In fact according to some testing specifications of these high temperature chimneys there should be a two inch clearance between the chimney and any wooden surfaces through which the chimney extends.
Accordingly a conventional chimney having an outside diameter of fourteen inches is not generally acceptable for fitting through wooden supports spaced sixteen inches from one another. Furthermore with conventional insulated chimneys it is not merely a case of reducing the thickness of the wall since the insulating ma-terial presently available is not capable of providing adequate insulating properties when reduced in thickness.
SUMMARY OF THE PRESENT INVENTION
The present invention provides a high performance chimney which is generally made from chimney sections with each section being adapted to withstand extreme exhaust temperatures typical of those found on solid fuel burning stoves and the like. Each chimney section has a chimney wall defining a flue gas conduit, with the chimney wall consisting of an inner metallic flue liner, ~9'76~9 1 an exterior wall cover and insulating material between the flue liner and the exterior wall cover. According to the present invention the flue liner is provided with a first end which is located by guide means having a stop surface for receiving the first end of the flue liner with the guide means being deformable to allow clearance of the first end past the stop surface of the guide means as the chimney section is heated. This enables longitudinal expansion for reducing radial distortion of the flue liner when it is subjected to the extreme exhaust temperatures.
According to a preferred embodiment of the present invention the chimney section is insulated with a solid pack insulation comprising a mixture of silica and an expanded rock particle. With this particular insulation the wall has a thickness of about one to two inches to substantially reduce the overall diameter of the chimney section relative to conventional chimneys.
BRIEF DISCUSSION OF THE DRAWINGS
The above as well as other advantages and features of the present invention will be described in greater detail according to the preferred embodiments of the present invention in which:
Figure 1 is a perspective view looking down on a section of a high performance chimney according to a preferred embodiment of the present invention;
Figure 2 is a top view of the chimney section shown in Figure l;
Figure 3 is a sectional view of the chimney section shown in Figure l;
~3~'76~9 1 Figure 4 is an enlarged sectional view of the chimney wall region of two unheated coupled chimney sections according a preferred embodiment of the present invention;
Figure 5 is a view similar to Figure 4 with the chimney sections being heated; and Figure 6 is a further enlarged sectional view through the wall of two coupled chimney sections when unheated.
DETAILED DESCRIPTION ACCORDING TO THE PREFERRED EMBODIMENTS
Figure 1 shows a chimney section generally indicated at 1. This chimney section is one which can be coupled with other similar chimney sections for forming an entire chimney for a wood or coal burning stove, a fireplace, gas or oil heating appliances or any other type of device having a heated exhaust. Although the chimney section can easily be used with exhaust oF relatively low temperature it is specifically adapted to withstand extremely high exhaust temperatures. In fact, according to United States UL 103HT and Canadian ULC S629 testing requirements a chimney constructed from a plurality of these chimney sections must be capable of withstanding rigorous testing at various extreme exhaust -temperatures for different durations without substantial internal distortion.
Chimney section 1 which has a male end 3 and a female end 5 for coupling with other like chimney sections as well as other chimney fittings such as T and elbow fittings and comprises a chimney wall generally indicated at 9 in Figure 3. The chimney wall defines a i ~976S9 1 central flue gas conduit 7 of for example six, seven or eight inches depending upon the particular application for which it is used.
Chimney wall 9 comprises an inner flue liner 11, an outer wall cover 15 and insulating material 13 sandwiched between the flue liner and the outer wall cover Both the flue liner and the wall cover are constructed of metallic material, preferably stainless steel. Flue liner 11 has a thickness in the range of eighteen to twenty four thousandths of an inch to make the liner structurally stable while keeping the weight of the liner at a reasonable level.
One of the main concerns with respect to prior art structures is the maintaining of the structural integrity of the flue liner as it is heated, particularly when temperatures rise as high as those encountered in the test specifications mentioned above. The problem arises due to the expansion of the flue liner under severe heating and in accordance with conventional practice the flue liner tends to buckle inwardly into the flue opening causing substantial distortion within the chimney section and choking off the exhaust opening through the chimney.
The chimney section of the present invention is specifically adapted to substantially overcome this difficulty through the method of mounting the liner within the chimney section.
ore specifically liner 11 is mounted in a manner to allow its longitudinal expansion upon heating which substantially reduces radial distortion which might otherwise occur. The liner includes a first end lla at ~1~7~i59 1 the male side of the chimney section and a second end llb at the female side of the chimney section. End lla is used for locating the liner in position while as best seen in Figure 3, end llb is substantially free within the chimney section. Also provided at the male end of the chimney section is a chimney section cap 17 having an axially projecting skirt portion 19. This skirt portion terminates in a stepped region 21 interiorly of the flue liner with this stepped portion providing a stop surface for locating end lla within the chimney section during assembly as shown in Figure 4. This located position of the flue liner is maintained by a frictional engagement between stepped portion 21 and end lla of the flue liner.
As the chimney section is heated all of the metallic components have a tendency to graw due to thermal expansion. This causes the skirt portion 19 to move radially outwardly as it is heated and since the skirt portion is secured at its upper end and free at its lower end it expands outwardly by an increasing amount from the secured to the free or stepped end of the skirt portion as best seen in Figure 5. As the free end of the skirt portion deflects outwardly it has a tendency to push outwardly on end lla of the flue liner and at the same time to angle the stop surface of the stepped portion relative to the end of the flue liner. This provides a cam effect which allows previously located end lla to clear past the stop surface and expand longitudinally of the chimney section as shown in Figure 5 whole it is also expanding radially to further clear past the stop surface. At the same time end llb of the flue liner is 1 allowed to move longitudinally of the flue liner due to its substan-tially free floating within the chimney section. Since the overall liner is allowed -to expand leng-thwise there is very li-ttle -tendency to buckle inwardly thereby substantially reducing radial distortion of the flue liner.
In the event that the liner should become dislodged within the chimney section a retaining ring 25 is provided at the female end of the chimney section. This retaining ring includes an inwardly extending shoulder 29 which is normally Free of end llb of the flue liner and if necessary is adapted to engage a bead 12 running around the flue liner as shown in Figure 3 should the liner be released within the chimney section. For purposes of easing the fitting of the retaining ring over the flue liner end llb of the liner is fluted which provides increased clearance between the flue liner and the flange portion of the retaining ring.
For purposes of coupling similar chimney sections to one another, as shown in Figure 6, cap 17 at the male end of the chimney section is provided with a plurality of teeth 23 around its outer edge while retaining ring 25 is provided with a plurality of teeth 27 on its inner surface. The cooperation of teeth 27 on the female end of one chimney section with -teeth 23 of the male end of a second chimney section provides a bayonette type locking ac-tion between the two chimney sections as best seen in Figure 6 of the drawings.
7~;S5~
1 It will be noted that the insulating ma-terial within the chimney wall extends comple-tely to the male end of each chimney section. Therefore when two or more chimney sections are coupled with one another there is a continuous wall of insulation material along the entire length of the chimney even though the female end of each section is uninsulated.
Referring in more detail to the chimney wall, it has been found in the past that when using most conventional insulating materials a wall thickness of over two inches has been required to properly insulate a chimney in order to pass the United States and Canadian test specifications. Accordingly where the chimney has a flue conduit size of eight inches and a wall thickness in excess of two inches, the outside diameter of the chimney is something over twelve inches. However, according to the above tests, a specified clearance of typically two inches should be provided around the entire chimney which means that a chimney of an outside diameter of more than twelve inches should not be fitted through a building with supports spaced sixteen inches from one another as is the case with most buildings.
According to the present invention the wall can be reduced in thickness to two inches to pass Canadian requirements and to about one inch to pass Unlted States requirements, which are less strict, due -to the construction of the chimney including a solid pack insulation comprising a mixture of silica and expanded rock particle. The weight of the insula-tion keeps each chimney section, which may for example come in lengths of ?$
~9~6sg 1 about three feet, within a very reasonable weight range for purposes of do-it-yourself installations.
It will now be seen from the above that the chimney section of the present invention is one which is specifically adapted for use on devices producing a heated exhaust with each chimney section of the overall chimney being adapted to withstand extremely high temperatures while remaining relatively free of distortions within the chimney. Furthermore a chimney which is constructed with chimney sections of the present invention is one which has reduced overall diameter relative to conventional chimneys and is therefore suitable for installation in a standardized building construction.
Although various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
Claims (9)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A chimney section of a high performance chimney adapted to withstand extreme exhaust temperatures and for use on solid fuel burning devices, and the like, said chimney section comprising a chimney wall defining a flue gas conduit and consisting of an inner metallic flue liner, an exterior wall cover and insulating material between said flue liner and said exterior wall cover, said flue liner being free to expand within said chimney section to reduce distortion thereof when subjected to the extreme exhaust temperatures, and said chimney wall having a maximum wall thickness of about 2 inches.
2. A chimney section as claimed in claim 1 having a wall thickness of about 1 inch.
3. A chimney section as claimed in claim 1 having a wall thickness of about 2 inches.
4. A chimney section as claimed in Claims 2 or 3 wherein said flue liner is contructed of stainless steel having a thickness of between 18 and 24 thousandths of an inch.
5. A chimney section as claimed in claim 1, wherein said insulating material is a solid pack insulation comprising a mixture of silica and an expanded rock particle.
6. A chimney section as claimed in claim 1 having a male and a female end, said exterior wall cover being extended at said female end for overlapping the male end of a like chimney section and said male and female ends being provided with cooperating locking means for interlocking said chimney section with such like chimney section.
7. A chimney section as claimed in claim 6 including a retaining ring at said female end of said chimney section said flue liner being fluted for easing fitting of said retaining ring thereof.
8. A chimney section as claimed in claim 6 wherein said exterior wall cover is provided with outwardly located teeth at said male end and interiorly located teeth at said female end for twist fitting said chimney section to such like chimney section.
9. A chimney section as claimed in claim 6, which when interlocked to such like chimney section, forms an extended chimney having a substantially continuous wall of constant thickness insulation there along.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000435533A CA1197659A (en) | 1983-08-29 | 1983-08-29 | High temperature chimney |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000435533A CA1197659A (en) | 1983-08-29 | 1983-08-29 | High temperature chimney |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1197659A true CA1197659A (en) | 1985-12-10 |
Family
ID=4125963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000435533A Expired CA1197659A (en) | 1983-08-29 | 1983-08-29 | High temperature chimney |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1197659A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0286488A1 (en) * | 1987-04-10 | 1988-10-12 | Daniel Urion | Air-tight flue element with double walls and heat insulation |
| FR2697078A1 (en) * | 1992-10-21 | 1994-04-22 | Lorraine Laminage | Removable interchangeable stainless steel sheath for lime kiln - centred in brickwork housing, with aluminium balls between sheath and housing, facilitating sheath removal |
| US20200370749A1 (en) * | 2019-05-24 | 2020-11-26 | Air Distribution Technologies Ip, Llc | Cross compatible adapter for chimney sections with different outer diameters |
-
1983
- 1983-08-29 CA CA000435533A patent/CA1197659A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0286488A1 (en) * | 1987-04-10 | 1988-10-12 | Daniel Urion | Air-tight flue element with double walls and heat insulation |
| FR2613746A1 (en) * | 1987-04-10 | 1988-10-14 | Urion Daniel | DOUBLE-WALLED, CALORIFUATED DUAL SMOKE DUCT |
| FR2697078A1 (en) * | 1992-10-21 | 1994-04-22 | Lorraine Laminage | Removable interchangeable stainless steel sheath for lime kiln - centred in brickwork housing, with aluminium balls between sheath and housing, facilitating sheath removal |
| US20200370749A1 (en) * | 2019-05-24 | 2020-11-26 | Air Distribution Technologies Ip, Llc | Cross compatible adapter for chimney sections with different outer diameters |
| US11821626B2 (en) * | 2019-05-24 | 2023-11-21 | Cardinal Ip Holding, Llc | Cross compatible adapter for chimney sections with different outer diameters |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |