DuraVent DuraTech Chimney Firestop - For 7" Inner Diameter DuraTech: The venting pipe for this unit must have a 7" inner diameter. Stop! Think about it and pay attention. What type of firestop do you require? This DuraVent Firestop from the DuraTech series of products is the obvious answer! It's ideal for you! This firestop will not only properly maintain the fireproofing of your walls, but it is also constructed with inner walls that are 25% thicker than competitive pipework for further safety. So, if you want to sleep soundly every night, this is the product for you!

Size: 7 Inch 2" clearance to combustibles Firestop spacer for pipes 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