The flow of air.
Furnace makeup air intake.
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With a make up air unit that same 10 f air can be tempered to 50 f.
Make up air vent is the same thing as a fresh air intake vent.
Department of energy a defining feature of high efficiency furnaces is sealed combustion a process by which outdoor makeup air is piped directly into the burner.
According to the u s.
Fans furnaces water heaters etc.
Irc 2006 section m1602 2.
Step 1 locate a spot for the fresh air intake hood on the outside of the home.
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Need fresh or makeup air.
Your home furnace air intake location depends on where the furnace is.
Diy friendly cut a 4 25 inch hole in side of house.
The makeup air system consists of a make up air damper mounted on the return air duct of an hvac system and an intake air hood installed through an exterior wall to allow outdoor air into the home with the two being typically connected by installer supplied standard 6 galvanized sheet metal pipe.
Keep the intake hood away from exhaust vents dryer vents and furnace vents.
In many homes the fresh air intake is simply an open duct ran from an outside vent into a basement or any room housing the home s furnace.
Intakes should not be located directly above any wall exhaust or vent.
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Wall intakes must also be 10 feet from any exhaust fan discharge outlet unless that outlet is 3 feet or more above the intake location.
It is easy to install a fresh air intake for a furnace.
If the outside temperature is 100 f with 85 relative humidity then a standard ventilation fan is bringing in 100 f with 85 relative humidity air.
Intakes must be protected against rain and pest entry with durable rust and rodent proof materials.
Likewise if the outside air temperature is 10 f then the ventilation fan is bringing in 10 f air.