What is \"fan in a can\"?

stacie b_2

Hi,
A contractor visited my home recently to evaluate a replacement steam boiler. He said the local inspector would probably require a "fan in a can". He explained that it supplies fresh air to the boiler, and I would need this whether I replaced my boiler with oil or gas. Can anyone further explain what this device does?
Also, he mentioned a formula based on basement size that determines whether or not this is needed..does anyone know the formula?
Is this common? I'm just reluctant to have a hole drilled into the side of the house!
Thanks in advance, Nelson

Supply House Rick

Fan-in-a-can

When the thermostat calls for heat, the Fan-in-a-Drum engages and begins drawing air into the structure. When air flow is established, the pressure switch closes. The CAS sends a signal to the appliance, allowing the burner to fire. The Fan-in-a-Drum diffuses the outside air into the room near the burner to ensure adequate air for efficient combustion.

***From the Fields Controls web site

stacie b_2

Thanks, Rick!
I went to Field Controls and they have a lot of info, including the formula. I would definitely require this because my basement is "confined" for the new equipment. Guess there is no avoiding the hole through the wall...

ScottMP

Nelson

Its no worse than a dryer vent. Think of your boiler as a candle with a glass over it. Eventually it would go out. If you lifted the glass a little a let some fesh air in would burn better and longer. Your boiler has the same needs.
It actually a safty issue for you and your family as an applaince that is starved for air will have a tough time creating draft up the chimney. It could pull combustion gas back into your house and poison your breathing air with carbon monoixde.

Your doing the right thing and contractor gave you good advice.

Scott

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