It s got lots of dust and dirt probably a fair amount critter poop and maybe even some dead critters.
Fresh air intake attic.
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.
Hot air exhaust vents located at the peak of the roof allow hot air to escape.
Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic.
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This results in a constant upward air movement due to the buoyancy of warmer air.
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.
Attic air isn t the cleanest air around.
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That little filter isn t going to stop everything.
Do not use gable vents because it s possible to draw rain and snow into the attic.
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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If you have a fresh air intake the air is immediately replaced with fresh air from outside the home.
Use only soffit vents as fresh air intakes for powered attic ventilators.
That little filter probably also has some significant bypass around the edges so not all of the fresh air goes through the filter.
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