If the duct is a standard size, remove the register and drop the fan into the boot. Secure it to the floor on each side with screws. If the duct is smaller than standard, see photos below. Plug the ...

A duct booster fan - most people just call them booster fans - is a device that you can attach to your HVAC system's ductwork. It's supposed to increase airflow to rooms in your home that are far away ...