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    B-Vent Fireplaces

    B-vent gas fireplaces, also known as natural vent fireplaces, or as a b vent fireplace, use air from inside your home to fuel combustion and rely on the buoyancy of hot gases to vent exhaust through dedicated pipe systems. The simple design makes the b vent gas fireplace cheaper and easier to install than direct vent models, but they are much less efficient. You'll want to carefully consider your budget and heating needs before deciding whether a b-vent fireplace is right for you.
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    B-Vent Fireplaces Q&A with the NFI Certified Specialists

    * Please Note: All customer questions are answered by our NFI Certified Specialists free of charge!
    9 Questions & 9 Answers
    from Kearney, NE asked:
    July 13, 2017
    What is the difference between direct vent and B-vent fireplaces?
    1 Answer
    While similar in basic design principles, there are several differences between these two appliances. A B-vent appliance uses what is known as type B gas vent. This is a single tube that vents exhaust gases to the atmosphere and is always run vertically through the roof of a home. In order for the unit to operate, combustion air is drawn through the open front of the unit. In this sense, a B-vent appliance is much like a traditional wood burning fireplace. The two types also share the common design aspect of being relatively inefficient and they are primarily intended for ambiance. One advantage to a B-vent appliance however is that they are generally cheaper than direct vent units. Direct vent appliances use a sealed pane of glass to cover the fireplace opening, relying on a co-axial rigid vent pipe to both vent exhaust gases and draw combustion air for the burner assembly. They are more efficient than any other type of vented gas fireplace and as such, they can serve as an excellent supplemental heat source. Venting these units is relatively easy, as the vent systems can be routed both vertically and horizontally. One common drawback to direct vent models is the reflection of the glass, which can be a visual detractor. However, almost all customers grow accustomed to the look and no longer notice it.
    Submitted by: eFireplaceStore on July 13, 2017

    from Glenbrook, CA asked:
    October 27, 2020
    Can a B vent system be fitted with an automatic vent damper to reduce heat loss when fireplace is not in use?
    1 Answer
    Unfortunately, there is not a damper that would be compatible with a B-Vent unit,  as a failure of the damper could be extremely dangerous.
    Submitted by: Brennan W. on October 28, 2020

    from Washington, DC asked:
    December 11, 2019

    If you want to hook up a propane stove to an existing chimney pipe in the basement of a house can you use a direct vent propane heater without running a special vent pipe through the unlined chimney?  Or do you need a B-vent propane heater?

    1 Answer
    Though supporting the pipe may prove difficult, either direct vent pipe or B-vent pipe may be routed through an empty chimney chase with no clay flue liner as long as all required clearances are respected. However, if you wish to make a connection to an existing metal Class A chimney pipe, an approved chimney to direct vent conversion kit would be required. Duravent, for example, makes three different kits to accommodate connecting to a wide range of models of Class A pipe (46DVA-KCA, 46DVA-KCB, and 46DVA-KCC).  
    Submitted by: Cortney O. on December 11, 2019

    from Bedminster, NJ asked:
    August 13, 2019
    Do you have a B-Vent fireplace that is 5 inches or less?
    1 Answer
    Unfortunately, we do not offer any models that may use 5 inch B-vent pipe. 
    Submitted by: Will M. on August 14, 2019

    from Florida asked:
    March 21, 2019
    Are there gas fireplace B-vents that can be vented through the exterior wall instead of through the roof?
    1 Answer
    Unfortunately, all B-Vent models must be vented through the roof.
    Submitted by: Brennan W. on March 21, 2019

    Chris P
    from Nashville, TN asked:
    December 29, 2017
    we are looking for a b-vent fireplace insert....but we don't want gas logs...instead we want one that has the crushed glass in the bottom and flames come up thru the crushed glass...do you offer a unit like this?
    1 Answer
    B-vent fireplaces have largely waned in popularity as they do not provide any efficient or measurable heat, so the options will be limited and there is no model offered that will be configured with glass. You will have many more options when searching for a direct vent or ventless system configured with a fire glass burner.
    Submitted by: Will M. on December 29, 2017

    from Charleston, WV asked:
    November 1, 2017
    What is the temperature of the fumes in the exhaust pipe. Is it around 110 to 115 degrees?
    1 Answer
    B-Vent pipe is tested to temperatures up to 480 degrees Fahrenheit under the requirements of UL 441 national testing.
    Submitted by: Brennan W. on November 2, 2017

    from Charleston, SC asked:
    March 6, 2016
    Does a B-Vent fireplace require a chimney? Or can you use a flue only?
    1 Answer
    B-Vent fireplaces will require Class B double wall aluminum venting.
    Submitted by: Brennan W. on March 7, 2016

    from Vancouver, BC asked:
    May 14, 2014
    How much distance should I keep the framing/box away from the pipe?
    1 Answer
    B vent piping should maintain 1 inch of clearance to combustibles at all times. As long as this minimum clearance is met, combustibles are not in danger of charring over time.
    Submitted by: Collin C. - NFI Master Hearth Professional on May 14, 2014

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