Flex-A-Lite 410/420 Electric fans are the lowest profile electric fan on the market. These dual action fans is capable of moving 2,500 CFM of air. Lightweight and ease of install makes these fans the prime choice when upgrading to electric fans. The 410 model includes a thermostatic control box for thermostat control, A/C activation, and manual switch connection. The 420 model does not contain the thermostatic control box so it must be wired to a relay or an aftermarket controller.