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Subject Author Date
make up air JohnnyC 03-08-2008
|--> Re: make up air Joseph Meehan03-09-2008
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Posted by JohnnyC on March 8, 2008, 6:42 pm
I've got to have an HVAC guy add make-up combustion air to my fha furnace.
This is a requirement from the local building inspector.

I had a guy come buy and recommened a 'fan in a can'. Couple of
questions...what are these -and- how much do they cost to install?

I can't seem to find something titled 'fan in a can' with google.
thanks.



Real Goods Solar, Inc.
Posted by Dr. Hardcrab on March 8, 2008, 10:17 pm

> I've got to have an HVAC guy add make-up combustion air to my fha furnace.
> This is a requirement from the local building inspector.
>
> I had a guy come buy and recommened a 'fan in a can'. Couple of
> questions...what are these -and- how much do they cost to install?
>
> I can't seem to find something titled 'fan in a can' with google.
> thanks.

Taint cheap.....

http://www.hhydro.com/cgi-bin/hhydro/FAN.html


Posted by Joseph Meehan on March 9, 2008, 8:07 am
I am a little surprised that they want a power vent. I can understand
why they may want makeup air.

--
Joseph Meehan

Dia 's Muire duit



> I've got to have an HVAC guy add make-up combustion air to my fha furnace.
> This is a requirement from the local building inspector.
>
> I had a guy come buy and recommened a 'fan in a can'. Couple of
> questions...what are these -and- how much do they cost to install?
>
> I can't seem to find something titled 'fan in a can' with google.
> thanks.
>
>

Posted by DanG on March 9, 2008, 10:14 am
You have a few words wrong.

Make up air is a term used with large exhaust hoods like those
found in restaurants. They have one blower bringing in the amount
of air that the exhaust hood is removing.

Your HVAC requires two things: both combustion air and fresh air.

Code requires a percentage of fresh air in the return/supply
system of the furnace to provide a healthy mix for humans.
Continually recycling the same air with no fresh will lead to high
CO2 numbers. Not a huge deal at home compared to a school or
other high usage setting, but now very much required by code.

Combustion air provides the air that the flame needs to burn
efficiently. This must be supplied by open access to outdoor air,
not robbing air from the room. A furnace on an outside wall is
usually satisfied with an open louver system with one high and one
low. There are other arrangements when the furnace is not at an
outside wall that involve ducting. I am not familiar with a fan
driven combustion air situation, though they may well exist.

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net



> I've got to have an HVAC guy add make-up combustion air to my
> fha furnace. This is a requirement from the local building
> inspector.
>
> I had a guy come buy and recommened a 'fan in a can'. Couple of
> questions...what are these -and- how much do they cost to
> install?
>
> I can't seem to find something titled 'fan in a can' with
> google.
> thanks.
>
>



Posted by Nate Nagel on March 9, 2008, 10:59 am
DanG wrote:
> You have a few words wrong.
>
> Make up air is a term used with large exhaust hoods like those
> found in restaurants. They have one blower bringing in the amount
> of air that the exhaust hood is removing.
>
> Your HVAC requires two things: both combustion air and fresh air.
>
> Code requires a percentage of fresh air in the return/supply
> system of the furnace to provide a healthy mix for humans.
> Continually recycling the same air with no fresh will lead to high
> CO2 numbers. Not a huge deal at home compared to a school or
> other high usage setting, but now very much required by code.
>
> Combustion air provides the air that the flame needs to burn
> efficiently. This must be supplied by open access to outdoor air,
> not robbing air from the room. A furnace on an outside wall is
> usually satisfied with an open louver system with one high and one
> low. There are other arrangements when the furnace is not at an
> outside wall that involve ducting. I am not familiar with a fan
> driven combustion air situation, though they may well exist.
>

Sure they do. A high efficiency gas furnace is one example of a burner
using a fan to provide combustion air.

nate

--
replace "roosters" with "cox" to reply.
http://members.cox.net/njnagel

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