It s got lots of dust and dirt probably a fair amount critter poop and maybe even some dead critters.
Fresh air intake attic.
A fan powered freshair intake draws in a continuous 20 to 30 cfm.
In all seasons the attic space is warmer than the outside air.
Do not use gable vents because it s possible to draw rain and snow into the attic.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
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That little filter isn t going to stop everything.
Both devices warm up the intake air during cold weather and cool it down during warm weather to reduce the load on the hvac system.
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Hot air exhaust vents located at the peak of the roof allow hot air to escape.
An encapsulated semiconditioned attic houses the mechanicals for one of the author s highperformance homes.
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Attic air isn t the cleanest air around.
Homes without a fresh air intake close to a conventional furnace will often draw air in from attics crawl spaces dryer vents and a host of other unconditioned spaces that reduce the quality of the air you and your family breathe.
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This results in a constant upward air movement due to the buoyancy of warmer air.
If you have a fresh air intake the air is immediately replaced with fresh air from outside the home.