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Old 10-30-2012, 09:33 PM   #1
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What is this Vent?


I have a circulating fireplace in my mobile home. The flue vents out the top however, there is also another type of flue on the side behind the firebrick veneer. (it is metal box with firebrick on bottom and thin brick on sides)
the vent can be opened and shut aparently with a little bar that sticks above the brick, and there seems to be a vent directly under the house through the underbelly.
What is this vent for, is it for warming under the house, or taking in fresh air?
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Old 10-30-2012, 10:21 PM   #2
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What is this Vent?


Sounds like a fresh air intake so the fireplace draws air from outside instead of letting the heated air from inside the house go up the chimney.
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Old 10-30-2012, 10:44 PM   #3
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What is this Vent?


got a photo or two?
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Old 10-31-2012, 09:25 AM   #4
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What is this Vent?


Exactly right.

Fireplaces have a tendency to create low pressure in a house because of the hot air, which essentially sucks the air from the rest of the house to the location of the fire which ultimately exhausts the air out the flue.

The effect is, the immediate room near the fire stays warm due to the convection of the flame while the rest of the house is cooler than it would have been.

It sounds like you have an combustion air intake built in to attempt to mitigate this common occurrence.
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Old 10-31-2012, 09:54 AM   #5
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What is this Vent?


you know what it is an air intake. I found the model number on the end of it.
Fireplace Part Model AK6
what is the purpose of this, as i am not fireplace knowledgable
and does it need an air vent next to it on the skirting, or is the air under the skirting sufficient.
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Old 10-31-2012, 11:58 AM   #6
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What is this Vent?


In order for smoke to go up the chimney there has to be a flow of air up. The heat rising creates this flow. However for every bit air and smoke that flows up the chimney more air has to flow into your house to replace the air the rising smoke draws from the room. This air comes from holes in you house around windows, doors, exhaust fans etc. The fresh air intake in the fireplace supplies the fire air and prevents some of the draw on house air.
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