Attic In Ranch

Throw duct leakage into the mix and the problems are.

Attic in ranch.

An attic can get up to about 130 f in the summer and the conditioned air entering the ducts is about 55 f or so. Photos 1 6 show how it s done. The bigger the house for whole house fans or attic space for attic venting fans the higher the cfm figure you need. Gaps in the attic or between the lower floors and the attic will let heated or cooled air escape to the great unconditioned outdoors making any insulation you add essentially useless.

Find a diagram of common air leaks here here s a quick primer on fixing draft prone spots. It s a classic post war ranch house built in the 50s to meet the needs of the soldiers returning from ww2 and the needs of their growing families. With hundreds of square feet of ductwork surface area in the attic and a δt of 75 f the air coming out of the vents in your home will be significantly higher than 55 f. Some fans are twin speed so two cfm ratings are given.

Now that i know the ins and outs of attics i wanted to share more about what i ve learned about venting your attic if you don t have eaves. Mark the roof venting locations from the attic where you can see the rafters and avoid placing roofing vents over them. Motor power given in amps or horsepower isn t a major factor so long as it generates the required cubic feet per minute. But before you cut any holes plan the locations of the attic vents.

Adding attic vents is a simple matter of cutting holes and installing vents.