DuraVent PolyPro 8" Double-Wall Appliance Adapter w73.75 They might look like charcoal

They might look like charcoal

corn and other biofuels

gas log sets are often installed during a vented or vent-free setting

thanks to Sunstar

DuraVent PolyPro 8" Double-Wall Appliance Adapter w73.75 They might look like charcoalOverview DuraVent is the premier company in the venting industry. With a broad range of engineered venting products, DuraVent has earned its reputation as the industry leader by offering innovative, safe, and professional products for the HVAC and Hearth markets. PolyPro and PVC CPVC: PVC pipes are commonly used for venting water heaters, condensing boilers, and warm air furnaces. PolyPro is an engineered alternative for condensing gas appliances.