DuraVent Model BV

What DuraVent Model BV vents

This B vent pipe is round Type B gas vent for draft hood equipped appliances such as gas-fired furnaces, boilers, water heaters and natural gas fireplaces. It is double-wall pipe with an aluminum inner wall and a galvanized steel outer wall. Warm exhaust rises naturally, while a draft hood admits room air at the appliance outlet. Approved appliances can share a properly sized vent. Round diameters span 3 to 30 inches, with sizing determined by appliance instructions and fuel gas sizing tables. Keep 1 inch of open air between the vent and anything that can burn, including wires and insulation. In Canada the 26 to 30 inch sizes need 2 inches.

Round and oval pipe

Round pipe in 3 to 8 inch sizes comes in lengths from 6 to 60 inches, with push-together joints secured by a thumb-pressed tab. Use adjustable pipe to fill gaps, never cut pipe or fittings. Oval pipe fits inside a stud wall above a wall furnace. Oval kits supply plates, with the vent kit also including pipe and an oval-to-round adapter. Oval Model BV is sold in the USA only.

Pieces from appliance to cap

Start with a connector or flexible connector, then use elbows for offsets and a tee or wye where the design calls for branches. Plan supports, firestops at floor and ceiling crossings, an attic insulation shield and a wall thimble for a wall crossing. At the roof, match flashing to the pitch and add a storm collar and approved cap. Roof top kits include the connector and roof pieces, while you add pipe on the page.

When you need another vent

A sealed gas fireplace uses DuraVent DirectVent Pro when its manual specifies that system. A wood stove needs chimney pipe such as DuraTech insulated chimney, while a pellet stove takes PelletVent Pro. Condensing gas appliances need a suitable system such as PolyPro venting. Its flexible liner can use old B vent as a sleeve. For a gas appliance venting into a masonry chimney, DuraFlex Aluminum liner joins this line through a flex adapter.

Why buy DuraVent B vent from My Cozy Outdoors?

We are an authorized DuraVent dealer, and the full manufacturer warranty applies. Send us the appliance model and a sketch of the run and we will write the parts list. Browse the DuraVent brand collection for other systems. Keep each run within its specified line unless an approved adapter permits the connection.

B vent questions

What is a B vent?

B vent has an aluminum inner pipe, a galvanized steel outer pipe and air between the walls. It serves approved natural gas or propane water heaters, furnaces, boilers and fireplaces. Their warm exhaust rises on its own, a process called natural draft. Model BV is DuraVent's B vent.

Is B vent the same as direct vent?

No, a B vent appliance uses room air for combustion, and its exhaust rises naturally. A sealed direct vent appliance sends exhaust through an inner pipe and draws outside air through the outer passage. Your appliance manual tells you which system it needs.

Is a B vent OK for a pellet stove?

No, a pellet stove needs pellet vent with a stainless steel inner pipe and sealed joints for its fan-pushed exhaust and fine ash. PelletVent Pro is a pellet vent system. Never connect a pellet stove directly to unlined DuraVent B vent.