do a search on home ventilation and you will find alot of companies that
sell variour ventilator and will have this info.. i went to either Home
depot or lowes and took some advertising papers from the racks.. in the
area of the power vents.. think they had some on the stationary vents
for the soffit.. i recently changed out my soffit vents. about 8 in. by
16 in. alum. vents that were nailed to the bottom of the soffit... none
in the front of house.... the 16 were placed around the sides and back
of the 30 by 60 brick house on concrete slab.. built in 1972 by a home
builder... about 15 yrs. ago i build a garage/workshop in the back yard
about 15 by 20 ft. and there is soffit on both sides(two) non in the
front or back.. i got four soffit vents on each side of the building....
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