The difference thus far is installation.
The biggest difference in B-Vent vs. Direct Vent is that the Direct Vent appliances are sealed to the room.
Type B Gas Vent is designed for negative pressure applications and flue gas temperatures not exceeding 400°F above ambient for Category I appliances.
The Type A chimney is suitable for use with an appliance that burns gas, oil or solid fuel provided that the temperature of the flue gas does not exceed 540°C (1000°F). A gas vent consists of factory-made metal sections that can be joined together on site.
The Amerivent all-metal, double-wall gas vent is listed as Type B by Underwriters Laboratories, Inc. and is approved for such residential and commercial applications as Category 1 water heaters, boilers, furnaces, space heaters, or wall heaters.
Ringfit Pipes come in two different classes – “Type A” and “Type B.” Type A pipes are typically used for ventilation and rainwater applications, while Type B pipes are suitable for soil and waste discharge.
There are two basic types of chimney pipes: class A and class B. Class A chimney pipes are used solely as an exhaust pipe, while class B pipes feature both intake and exhaust mechanisms. Most chimney pipes are class A, as this class requires only basic venting for internal appliances (e.g., stoves and fireplaces).
Use with natural gas or liquid propane category I and draft hood 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.
Outside vents could reduce venting action; therefore, such installations are not recommended.
Type B Vent shall not be used to vent flue products from incinerators, combination gas/ oil appliances, oil-fired, or wood-burning appliances. If there is a question about the use of Type B Vents, contact the appliance manufacturer or DuraVent's Engineering Department for further information. 1. Appliances.
No. Per the sizing tables, all orientations must terminate vertically with a UL listed rain cap, otherwise the appliance may not vent properly.
B-vent is ONLY allowed on Category 1 appliances unless the appliance manufacturer has specifically certified a particular B-vent system to be used alternatively.
A direct-vent sealed-combustion furnace, boiler, or water heater brings combustion air directly from outdoors to the sealed combustion chamber through one sealed pipe and exhausts the byproducts of combustion (carbon dioxide and nitrogen) to the outdoors through a second sealed pipe.
Direct vent fireplaces offer a range of safety features that make them a top choice for home heating. These fireplaces are sealed systems, preventing indoor air pollution and reducing the risk of carbon monoxide poisoning.
Q: How hot does direct vent pipe get? A: Direct vent pipes can get very hot, typically ranging between 300°F to 500°F, depending on the appliance and usage.
A gas fireplace has a bottom vent through which the cool air in the room is drawn into and is then transferred through a chamber that encompasses the firebox. It then connects to a vent at the top. The combustion chamber or firebox is the area of the fireplace in which the fire and heat are generated.
Direct vent is much more efficient, you're pulling fresh air from outside of the house. While you're simultaneously exhausting and gives you more flexibility from an install stand point and most of all direct vent systems are going to heat much better because they are sealed units.
B-Vent, also known as Type B vent or natural draft vent, is commonly used for venting gas appliances that are designed to use indoor air for combustion. These appliances typically have a draft hood to facilitate the flow of air and exhaust gases.
Although not required under the terms of the UL Listing because of the integral couplers, screws are permitted to be installed at the joints in 3” through 8” vent.
Type B vents must be equipped with their own special chimney caps. If the cap is damaged or lost, it should not be substituted with something not recommended by the manufacturer. The clearance required from combustible materials is printed on the flue's exterior metal surface, and is generally 1 or 2 inches.
The vent pipe should be run up to a point where the top end is at least a foot or so above the roof.
If you plan to use an existing chimney, both its location and the length of its flue will be determining factors. Note these guidelines: The horizontal section of the uninsulated stove pipe should not be more than three-quarters as long as that section of the flue above the point at which the pipe and the flue connect.
B-Vent fireplaces are safe, like direct vent fireplaces, the byproducts of combustion are sent outside of the home. There is the possibility a downdraft from the outdoors will travel through the B-Vents piping, but many units have a sensor that will shut off the fireplace if this occurs.
A factory-made gas vent listed by a nationally recognized testing agency for venting listed or approved appliances equipped to burn only gas.