Simpson Dura-Vent Fireplace - Venting Pipe Aluminum High-Wind Cap with 28 Inch Inner Diameter High-Wind Cap Simpson DuraVent's Type B Gas Vent system. Use with natural gas or liquid propane category I and drafthood equipped appliances, and appliances tested and listed to use Type B Gas Vent. Applications include: natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating applications. Type B Gas Vent has been engineered to heat up rapidly. It remains hot during the operation of the appliance with minimal condensation on the appliance and vent system. Simpson DuraVent Type B Gas Vent is designed to meet the rugged demands of the job site. The inner wall is recessed to eliminate damage in handling. Use for horizontal through-the-wall terminations. Provides improved performance in high wind conditions. For vertical terminations only. 28" Inner Diameter Aluminum High-Wind Cap with 28 Inch Inner Diameter by Simpson Dura-Vent is known as model number 28GVVT |