ComfortBilt RB-21 Convection Blower for HP21 Pellet Stoves. ComfortBilt Pellet Stove Convection Blower for the HP21. The purpose of this fan is to circulate room air around the back of the stove and force it through the unit’s heat exchanger. This fan is responsible for blowing heated air into the room. Disconnect the power from the unit. Remove the rear and side panels from the stove (You may not need to remove all three panels). Disconnect both power wires running to the fan motor. Loosen the bolts attaching the mounting bracket to the stove and remove the fan assembly. Position the new fan assembly in place and reinstall the previously removed bolts. Connect the previously removed power wires to the tabs on the new motor. Reinstall any stove panels that were removed. Plug in the unit. Benefits of Adding a Fireplace Blower. Improves fireplace efficiency by as much as 80%. Helps reduce costly energy bills. Heats large rooms effectively. Installs quickly and easily. L x W x H. Blower, Motor & Bearing. Included Velcro, tape and noise reduction padding. Noise Reduction Padding & Velcro. Listing and template services provided by inkFrog.