DuraVent DuraTech 24" Tall Ceiling Support Box with Attic Insulation Shield - For 6" Inner Diameter DuraTech: A vent pipe with a 6" inner diameter is required for this unit. Where are you having trouble connecting the piping infrastructure in your home? Is your project nearing completion? Maybe right where the chimney joins the house? Don't be concerned any longer! Your problem will be solved with our DuraVent Square Ceiling Support Box! With a built-in twist lock mechanism, this product ensures a secure connection between the support box and the chimney pipe. You may also rest easy knowing that your home is safe, thanks to inner walls that are 25% thicker than the competitors. So, what are you waiting for? Make a move right now!

Size: 6 Inch Product Dimensions: 12" W x 24" H x 12" D 2" clearance to combustibles No locking bands or mechanical fasteners required 24" 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