Combustion air line

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jeremymcl

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Hello,
I have a 4” insulated combustion air line coming in beside my furnace. I know it’s need for air flow. My question is when nothing is running, there is still a breeze of air coming in. Is this normal? Or will hot water tank keep suction going?

thank you
 
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kok328

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Should be that much of a breeze and hopefully they installed it to a few inches off the floor so that won't happen as bad.
For mine, I installed and electronic damper on the end of the duct and tied that back to the transformer for the humidistat.
With the humidifier set, when the furnace comes on the damper opens to allow for combustion air.
When the furnace shuts off, the damper closes and prevents that cold air breeze.
 

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