What is a Class B vent?

Sometimes referred to as Natural Vent – B-Vent appliances use pipe (b-vent) that must be installed through the home and terminate above the roof. They also use room air for combustion, but the amount of air they use is minimal. Some of the heat from the appliance is lost up the vent. …

What are Type B gas vents used for?

Type B vents are vents suitable only for listed, draft-hood equipped, gas-fired appliances, including most domestic heating and hot water systems. any appliance that produces flue gasses that exceed 480° F (249° C).

What is a furnace B vent?

Type B vents are designed for venting non-condensing gas appliances equipped with a draft hood or fan-assisted appliances with a non-positive vent pressure. Type BW vents are for gas-fired wall furnaces.

What size is B vent?

Simpson Dura-Vent Type-B gas vent pipe is available in lengths from 6-inch to 5-feet, and vent diameters range from 3-inch up to 30-inch, as well as 4-inch, 5-inch, and 6-inch oval vent.

What is the difference between B vent and direct vent?

A B-vent must be vented vertically and uses fresh air from inside the home to provide oxygen to the fire. A direct vent has a sealed glass front and pulls all of its fresh air from outside the home. Direct vents can be vented vertically or horizontally through an exterior wall.

Is B vent zero clearance?

Clearance to Combustibles. A 1-inch clearance (air space) to combustible materials must be maintained, when using DuraVent Round B-Vent, regardless of the pipe diameter. at least 2 feet higher than an adjacent wall or obstruction, if it is within 8 feet.

How does Type B vent work?

AmeriVent Type B gas vent uses a double wall of metal pipe for insulation and safety. The inner pipe of reflecting aluminum heats quickly, containing the warm flue gases inside. The airspace between the inner and the outer pipes provides insulation against heat loss to keep the warmer flue gases on the rise.

Is Type B Vent double wall?

AmeriVent Type B gas vent uses a double wall of metal pipe for insulation and safety. The inner pipe of reflecting aluminum heats quickly, containing the warm flue gases inside. The outer pipe of corrosion-resistant galvanized steel ensures strength, safety, and durability.

Is B vent single or double wall?

What is the clearance for B vent?

1-inch
A 1-inch clearance (air space) to combustible materials must be maintained, when using DuraVent Round B-Vent, regardless of the pipe diameter. at least 2 feet higher than an adjacent wall or obstruction, if it is within 8 feet.

Why can’t b vent be used horizontally?

According to manufacturers, all B vent pipes must terminate vertically with a rain cap in place in order to vent properly. An appliance that is approved to vent horizontally is most often not compatible with the use of a B vent pipe.

When to use a type B gas vent?

Type B Gas Vent is designed for negative pressure applications and flue gas temperatures not exceeding 400°F above ambient for Category I appliances. Durability is the result of high-quality materials and workmanship, with galvanized outer pipe and aluminum inner pipe providing protection against corrosion and external damage.

What kind of steel is a B vent?

B-Vent is of double wall construction, with the inner flue of aluminum alloy (allowing rapid warm-up and better draft) and the outer casing of galvanized steel or galvalume steel. Model M B-Vent is compatible with listed masonry relining systems, single wall connectors and other listed gas vents.

How is a B-vent pipe installed in a house?

1. 3.Metal-Fab B-Vent pipe and fittings were designed and are listed to form a continuous passageway from the gas burning appliance to the vent termination above the roof, including the vent cap. 2. These B-Vent components are to be installed with minimum one inch clearance to combustible material.

Can A B gas vent be installed in a multi story building?

MetalBest®Gas Vent pipe and fittings have been tested and listed per UL 441 for installation as Type “B” and B-W gas vents to be installed in single and multi-story buildings in accordance with the standards of The National Fire Protection Association NFPA54 and NFPA211. They must be enclosed in occupied portions of a building.