The Suncourt Flush Fit Smart Register Booster quietly boosts heated or cooled air to a room to improve circulation and comfort.  This register booster features a built-in temperature sensor and works automatically with forced air systems. The Flush Fit Smart Register Booster's quiet 5-speed; dual fans pull extra air out of weak registers, boosting airflow by up to 85%.  It is a simple, energy efficient and safe solution for rooms that are too hot or too cold.
- New patent pending self-learning technology turns the register booster on and off with your heating and air conditioning system without any programming necessary. 
- Set-up in seconds: plug-in, set on register and go 
- No seasonal temperature settings necessary 
- 5 fan speed settings, up to 132 CFM, for maximum control and comfort 
- Fits in a standard 4 inch by 10 inch register or purchase model HC500-BPL that includes an adaptor plate for for sizes 6 x 10 inch, 6 x 12 inch and 4 x 12 inch. 
- Can be installed in floor or wall registers, not recommended for ceiling registers 
- Fits flush with the floor or wall for a clean contemporary look 
- Low voltage, safe for children and pets 
- Assembled in the USA