VIVOSUN Quiet Register Booster Fan for 𝟒" 𝐱𝟏𝟎" Holes, Cooling Heating Vent with Intelligent Thermostat Control, 10-Speeds Increase Airflow Booster Fan for Bedroom & Attic, Matte White

Balance Room Temperatures: Designed to complement HVAC systems, this fan efficiently boosts the airflow of your existing AC or heater, effectively redistributing warm and cold air for a more balanced temperature; Enjoy enhanced comfort while saving energy and cutting costs
Ultra-Quiet Stator-Blade PWM Fans: Features hydro-mechanical stator blades that transfer air farther even in high static pressure environments, ensuring powerful performance; The PWM-controlled motor with dual ball bearings ensures precise speed control, energy-efficiency, quiet operation and an extended lifespan
Intelligent Programming: With a programmable LCD controller and high-precision temp probe sensor, this product automatically monitors temperature, and triggers fan to run at the cooling or heating temperatures you set, adjusting the fan speed accordingly; With 10 fan speeds, you can always get your desired airflow
Rugged Structure & Stylish Design: Features an premium aluminum frame with CNC-machined corners and a matte-white finish; A sturdy and stylish design allows it to blend in with any decor; The thermoplastic housing protects the fans from clogging and ensures durability
Easy to Install & Compact: Designed to fit perfectly into 4"×10" register holes; It can be easily mounted on wall or floor registers (not recommended for ceiling mounting). Its compact design allows it to take up minimal space while delivering optimal performance