cfm for ac

[chrism9232]

if you return is to loud from being to short. have a company line you return can with acustical insulation, it will reduce the noise by at least 30%.it only takes about a hour or two of labor and the material is cheap

they put what looks like bubble wrap with aluminum foil on both sides of it on the inside of it. the intake is only about 6 inches long

[dezerttech]

boy i love lack of return air and excessive fpm across filter grill

[chrism9232]

boy i love lack of return air and excessive fpm across filter grill

im not a pro but i think i have a lot of return air. i have a 14x25 on the side of the furnace and 4 6inch in the bottom of the furnace. what is fpm

[key1cc]

what is fpm

FPM is a measure of velocity...in this case air velocity in feet per minute (speed of air).

Where CFM is a measure of volume in Cubic feet per minute (amount of air).

If you know one of these and the square feet of duct area the air is traveling through....you can calculate the other.

Key1