Size: 7". Product Dimensions: 13" W x 11" H x 13" D. 2" clearance to combustibles 11" square ceiling support box with 7" diameter: There's no need for locking bands or mechanical fasteners. For an extra margin of safety, the inner wall is 25% thicker than competing chimneys. Designed for normal continuous operation at flue gas temperatures of 1000 degrees Fahrenheit. For use with wood stoves, fireplaces, furnaces, boilers, ranges, water heaters, and other wood, coal, or gas-fueled appliances. A vent pipe with a 7" inner diameter is required for this unit. Where are you having trouble connecting the piping infrastructure in your home? Maybe right where the chimney meets the house? So, don't be concerned! Your difficulty will be solved with this DuraVent Square Ceiling Support Box! With its built-in twist lock mechanism, this product ensures a secure connection between the support box and the chimney pipe. You may also relax knowing that your property is safe, thanks to inner walls that are 25% thicker than the competition. So, what are you waiting for? Make a move now!

Size: 7 Inch Product Dimensions: 13" W x 11" H x 13" D 2" clearance to combustibles 11" square ceiling support box with 7" diameter No locking bands or mechanical fasteners required Inner wall is 25% thicker than competitive chimneys for an extra margin of safety Designed for normal continuous operation at 1000 degree Fahrenheit flue gas temperatures For use with wood stoves fireplaces furnaces boilers ranges water heaters or other appliances fueled by wood oil coal or gas