DuraVent DuraTech 36" Tall Ceiling Support Box with Attic Insulation Shield - For 6" Inner Diameter: A vent pipe with a 6" inner diameter is required for this unit. Where are you having trouble connecting the pipes in your home? Is your project nearing its conclusion? Isn't it possible that it's right where the chimney connects? Don't be concerned! Your problem will be solved with the DuraVent Square Ceiling Support Box! With a built-in twist lock mechanism, this product ensures a secure connection between the support box and chimney pipe. You can also rest easy knowing that your home is protected thanks to inner walls that are 25% thicker than the competition.

Size: 6 Inch Product Dimensions: 12" W x 36" H x 12" D 2" clearance to combustibles No locking bands or mechanical fasteners required 36" square ceiling support box for pipes with 6" diameter 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