Specialty Chimney Flue Extension with Flat Lid
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Chimney Flue Extension
Chimney Flue Extension
Powder Coated Chimney Flue Extension
Powder Coat Options
Chimney Flue Extension Powder Coated
Product Details
Specifications
Increase height and draft with our Specialty Chimney Flue Extension. Securely fastened to the uppermost clay liner, these caps can also increase the vertical distance among flues in a multi-flue chimney, reducing the likelihood of smoke being drawn into a downstairs flue.
- 22" Flue Extension increases height by 1 foot
- 34" Flue Extension increases height by 2 feet
Add beauty & curb appeal to your chimney cap by adding optional powder coating. See image swatch above for color options - Read More About Powder Coating
Fabrication time is currently 1 week due to item popularity. Powder coating adds 1 week to the timeline (and is worth the wait!). Due to a variety of sizes and options, each Specialty Flue Extension is made custom per order and is non-returnable.
The Chimney Flue Extension is designed to mount to chimney tile. It can be converted to a Crown Mount by adding a Crown Mount Adapter. You will need this if there is no existing flue tile extending from the chimney top or the flue tile is too short. Note: Must choose "Bolt On" style Specialty Flue Extension with the Crown Mount Adapter.
Chimney Flue Extension Sizing:
| Flue Extension Size | Fits Clay Tile Length | Fits Clay Tile Width |
|---|---|---|
| 8 x 8 | 7" to 9.25" | 7" to 9.25" |
| 8 x 13 | 7" to 9.25" | 11" to 13.5" |
| 13 x 13 | 11" to 13.5" | 11" to 13.5" |
| 13 x 18 | 11" to 13.5" | 16" to 18.25" |
Measuring for Your Chimney Flue Extension
Measuring the clay flue or chimney opening is an easy thing to do before ordering. In any case, this ensures the flue extension will fit properly.
For clay flue tiles, measure the length, width, and height of the tile. Moreover, for chimney openings that do not have a clay tile protruding above the crown, measure the length and width of the opening (you will need a Crown Mount Adapter for this type of installation). Then, compare these measurements to our sizing chart to find out which size cap to order.
If you need more height than this cap can provide, please consider installing an insulated chimney pipe kit to increase the height of your masonry chimney.
- Outside length of clay flue tile
- Outside width of clay flue tile
- Height of clay flue tile
Installation
Above all, protecting your clay flue and increasing chimney height by installing our stainless steel chimney flue extension is simple. Additionally, follow these tips for a successful installation.
Firstly, place a bead of high-grade exterior silicone along the top of the clay flue. Then, firmly press the single flue cap over the clay flue to create a good bond. Finally, for the Bolt On mounting type, you will need to gently tighten the cone point pressure screws until they make contact with the clay flue tile. Be sure you do not overtighten.
For Clamp On mounting type installations, simply tighten the clamp around the outside of the clay tile. Do not select the clamp on mounting type if using a Crown Mount Adapter.
For installations where the chimney opening does not have a clay tile protruding above the crown, you will need to install the Crown Mount Adapter first. Finally, you can put a bead of silicone where extension cap meets the chimney crown.
In general, should you have any questions, contact our Certified Technicians for helpful support.
Product Details:
Increase height and draft with our Specialty Chimney Flue Extension. Securely fastened to the uppermost clay liner, these caps can also increase the vertical distance among flues in a multi-flue chimney, reducing the likelihood of smoke being drawn into a downstairs flue.
- 22" Flue Extension increases height by 1 foot
- 34" Flue Extension increases height by 2 feet
Add beauty & curb appeal to your chimney cap by adding optional powder coating. See image swatch above for color options - Read More About Powder Coating
Fabrication time is currently 1 week due to item popularity. Powder coating adds 1 week to the timeline (and is worth the wait!). Due to a variety of sizes and options, each Specialty Flue Extension is made custom per order and is non-returnable.
The Chimney Flue Extension is designed to mount to chimney tile. It can be converted to a Crown Mount by adding a Crown Mount Adapter. You will need this if there is no existing flue tile extending from the chimney top or the flue tile is too short. Note: Must choose "Bolt On" style Specialty Flue Extension with the Crown Mount Adapter.
Chimney Flue Extension Sizing:
| Flue Extension Size | Fits Clay Tile Length | Fits Clay Tile Width |
|---|---|---|
| 8 x 8 | 7" to 9.25" | 7" to 9.25" |
| 8 x 13 | 7" to 9.25" | 11" to 13.5" |
| 13 x 13 | 11" to 13.5" | 11" to 13.5" |
| 13 x 18 | 11" to 13.5" | 16" to 18.25" |
Measuring for Your Chimney Flue Extension
Measuring the clay flue or chimney opening is an easy thing to do before ordering. In any case, this ensures the flue extension will fit properly.
For clay flue tiles, measure the length, width, and height of the tile. Moreover, for chimney openings that do not have a clay tile protruding above the crown, measure the length and width of the opening (you will need a Crown Mount Adapter for this type of installation). Then, compare these measurements to our sizing chart to find out which size cap to order.
If you need more height than this cap can provide, please consider installing an insulated chimney pipe kit to increase the height of your masonry chimney.
- Outside length of clay flue tile
- Outside width of clay flue tile
- Height of clay flue tile
Installation
Above all, protecting your clay flue and increasing chimney height by installing our stainless steel chimney flue extension is simple. Additionally, follow these tips for a successful installation.
Firstly, place a bead of high-grade exterior silicone along the top of the clay flue. Then, firmly press the single flue cap over the clay flue to create a good bond. Finally, for the Bolt On mounting type, you will need to gently tighten the cone point pressure screws until they make contact with the clay flue tile. Be sure you do not overtighten.
For Clamp On mounting type installations, simply tighten the clamp around the outside of the clay tile. Do not select the clamp on mounting type if using a Crown Mount Adapter.
For installations where the chimney opening does not have a clay tile protruding above the crown, you will need to install the Crown Mount Adapter first. Finally, you can put a bead of silicone where extension cap meets the chimney crown.
In general, should you have any questions, contact our Certified Technicians for helpful support.
Specifications:
Customer Reviews
This is a well built product and installs and works as advertised. No more draft problems with our fireplace!! I will be purchasing an additional flue extension for our downstairs fireplace.
Fit as advertised and delivered on schedule.
Our chimney extention came within the time expected, well boxed, fit as it should. On phone advice we added guide wires since it was 34” tall to secure from wind. Looks neat and does the job we’d hoped for: improved draw of woodstove. We felt it was worth the cost.
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Our 316Ti flexible chimney liner and chimney liner components have passed the rigorous testing at the Underwriters Laboratories with best in class status and are UL Listed. So if you are looking for UL listed chimney liner sold directly to homeowners, then look no further than Rockford Chimney
