Ghost Whole House Fan w/ R38 Insulated Doors Energy efficient whole house fan cools the indoor air in your whole house! Energy Efficient R-38 Insulated, Easy Installation, 2 speeds: 3400 CFM / 1900 CFM Fits 16" or 24" On Center Joists - No Joist Cutting Needed 3 Year Limited Warranty, Assembled in the USA 6' Line Cord, UL Listed, Remote Controlled, Title 24 Compliant