I forgot to mention anywhere that after I had had my attic fan, roof
fan, for about 15 years, I was up on a ladder and found a layer of
lint or something over the entire soffit vent. It was like the lint
one takes off the lint trap in a clothes dryer, though not as heavy as
it gets in my drier. I have a two story townhouse and couldn't see it
from the ground, even when I knew it was there.
My soffit vents are about 4 inches deep, front and back of the house
and as wide as the house is wide, covered with something like window
Smaller soffit vents would get an even thicker level of "lint".
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