What Size System Should I Purchase?

CentricAir recommends that clients consider purchasing the largest whole house fan that their home has the attic ventilation for. It’s very likely for example that a 1800 sqft home will have sufficient attic ventilation for our CentricAir 2.7 model which requires about 3.25 sqft of net free attic ventilation. However, if this same size home has enough attic ventilation for our CentricAir 3.4 system, which requires about 4.0 sqft of net free attic ventilation, this may be worth considering since it’s only slightly more expensive and will cool your home even faster. We do not, however, recommend adding additional roof ventilation just to go with a larger whole house fan.