Run your new wood-burning stove’s exhaust vent pipe out through your ceiling with the DuraVent Simpson Triple Wall Flat Ceiling Support Box.
This vent ceiling support box is designed for 2100 DegHT chimney systems, such as wood stoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas. The chimney installation box is manufactured from thick galvanized steel with a trim. Properly installed, the ceiling box can support up to 35 feet of DuraPlus vent pipe, making it perfect for small homes and large industrial shops alike. The support box is rigorously tested to withstand continual use at high temperatures. This support box must be used with the DuraPlus systems, such as the DuraPlus chimney pipe in 6-inch, 9-inch, and 12-inch lengths with a 1-inch insulating blanket. The supported fuels for this box are wood, oil, and coal. Rated for continuous use at 1000 degrees, and intermittent use at 2100 degrees.
Enjoy an effortless installation with the DuraVent Simpson Triple Wall Flat Ceiling Support Box.
- Connect your wood-burning stove vent through the ceiling with this support box
- Constructed from long-lasting galvanized steel with a trim
- Starter section built-in and includes all decorative trim parts for quick and convenient install
- Support up to 35 feet of DuraPlus vent pipe, making it perfect for small homes
- Designed for 2100 DegHT chimney systems, such as wood stoves, furnaces, boilers, or other appliances fueled by wood, oil, coal, or gas
- Used with the DuraPlus systems such as the DuraPlus chimney pipe in 6-inch, 9-inch, and 12-inch lengths with a 1-inch insulating blanket
- Supported fuels for this box are wood, oil, and coal
- Rated for continuous use at 1000 degrees, intermittent use at 2100 degrees
- Material: Galvanized Steel
- Color: Silver
- Dimensions (L x W x H): 14.92 x 14.29 x 4 inches
- Weight: 6.02 pounds
- Manufacturer warranty: Limited-lifetime warranty
Questions? We’ve Got Answers.
Helpful answers about product features, setup, and more
What is the box constructed from?
The box is constructed from steel. This material choice supports everyday use while maintaining the structural integrity needed for the product’s intended applications.
How big is the box?
The box measures 14.92 x 14.29 x 4 inches (length x width x height). Use these measurements to confirm the product will fit your intended space and clearance areas before ordering.
Is there a warranty on the box?
Yes. The box is backed by lifetime warranty. Coverage details and claim procedures are provided by the manufacturer; retain your order receipt as proof of purchase if you ever need to file a claim.
What is the box typically used for?
The box is used to organize and store everyday items, keeping them contained and easy to access. Common uses include household supplies, tools, gear, seasonal items, or workspace materials depending on the size and design of the product. Confirm the dimensions and capacity match your specific storage need before ordering.
What is the best way to maintain the box?
Wipe with a damp cloth and dry thoroughly to prevent rust. For powder-coated finishes, avoid abrasive cleaners that may scratch the coating. Regular light cleaning extends the lifespan of the box and keeps it looking and performing well over time.
Who makes the box?
The box is made by DuraVent Simpson. DuraVent Simpson produces this item as part of its lineup, and product details such as specifications, included accessories, and warranty terms are set by the brand.


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