Out to estimate replacement of existing attic fan. Client wants solar powered roof mounted attic exhaust fan. Replace existing roof mounted attic fan with QuietCool Solar Attic Fan. Model#: AFR SLR-30W. 30 Watt attic fan with built-in thermostat that kicks on when temp reaches 88*F and turns off when temp meets 77*F. No wall switch. No wiring. 3-4 hours to install.