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B-Vent Fireplaces

B-vent or natural vent fireplaces use air from inside your home to fuel combustion and rely on the buoyancy of hot gases to vent exhaust through dedicated pipe systems. This simple design makes them 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.
By Dan from Vancouver, BC on January 29, 2013
Our B vent heat vent began to smoke this evening, a steady stream of steam that began to thicken, ended as soon as we doused the fire which had been burning well for 4 hours and had recently been given the thumbs up from a chimney sweep/ handyman. There was no smoke above normal coming from the fire in the grill. Is it possible something fell into the venting portion that is separate from the fireplace. Our model is built into the chimney stack with the vents enclosed separately to the side, directly under the chimney.
By Kevin E. - Fireplace Specialist on January 29, 2013

Answer:
Indeed, it is possible that there is some sort of foreign material in the vent system that is beginning to burn and in turn smoke. However, I apologize but I don't quite understand the venting system described. Is there a masonry chimney that is adjacent to the fireplace but not used for venting the B vent fireplace? We are happy to offer any insight we can.

By bob t. from Old Forge, NY on December 13, 2012
Can a B-vent fireplace be vented into an existing brick chimney?
By Tyler M. - Fireplace Specialist on December 13, 2012

Answer:
A B-Vent fireplace can indeed run its Type B pipe up an existing brick chimney. You can run the Type B pipe into a masonry wall, then pass through it with a thimble and connect it to a flexible aluminum liner.

By Doug from El Paso, Texas on December 18, 2012
I have a Devonshire direct vent gas fireplace. Can I run this as a B-vent?
By Tyler M. - Fireplace Specialist on December 18, 2012

Answer:
No. For proper venting, you must use the direct vent pipe (coaxial, pipe-within-a-pipe) specified in your owner's manual.

By Bev from Sumas, WA on April 15, 2013
I am looking for a B-Vent fireplace to replace an older unit. The venting I have is 5 5/8". Will this work with a unit that is 4 inch ?
By Chris on April 15, 2013

Answer:
I would suggest against using a larger or small pipe than what the manufacturer has recommended.

By Ronald from Stanwood, WA on March 28, 2013
I have a Heat & Glo b-vented gas fireplace installed with a 6.5 exhaust vent and I'm looking for a new unit. Do you have anything that would work with my existing venting? What would I need to do to make a new unit work?
By Tyler M. - NFI Certified Specialist on March 28, 2013

Answer:
B-Vent fireplaces are waning in popularity, so it is becoming more and more difficult to find new models. We do offer some models that have a 6" diameter B-Vent outlet, but none with the 6.5" that you mentioned. While it would be feasible to do a 6" to 6.5" increase to tie the unit into your existing pipe, we do not offer such a piece. You would need to have something fabricated to serve as the increaser. To see an example of a 6" B-Vent model, please see below:

Keystone Premium B-Vent Gas Fireplace with Remote-Ready Millivolt Controls - 42 Inch

By bill gibbs from Kalamazoo, MI on December 2, 2012
How long can the horizontal run be for the B-vent?
By Tyler M. - Fireplace Specialist on December 3, 2012

Answer:
The maximum allowed horizontal run for any B-vent fireplace will depend on the manufacturer's requirements for the specific model being vented. This information will be listed in the owner's manual.

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