Air Duct Booster Fans

Tjernlund Residential DUCT BOOSTER® FAN Price: $90.62
Tjernlund "Original" DUCT BOOSTERŪ FAN increases the comfort level in hard to heat or cool areas. Duct Air Booster Fan inserts into ROUND or FLAT air duct.. Boosts duct air flow up to 600 CFM.
Tjernlund ADJUSTABLE IN-LINE DUCT BOOSTER® FAN Price: $54.12
Tjernlund "Premium" DUCT BOOSTERŪ FAN boosts air flow into hard to heat and air conditiong rooms.  Can be used as an In-Line Exhaust Fan or in Fresh Air Intake applications. Installed in either ROUND air duct or FLAT air duct  6" or larger. Boosts duct air flow up to 280 CFM.  
Suncourt ADJUSTABLE INDUCTOR® DUCT BOOSTER FAN Price: $41.25
Suncourt ADJUSTABLE IN-LINE DUCT BOOSTER FAN enhances airflow to underperforming registers in rooms that are too hot or too cold. Installed into ROUND 6"- 8" Air Duct. Boosts duct air flow up to 250 CFM.    
Tjernlund 6" thru 14" IN-LINE DUCT BOOSTER FAN Price: $54.59
Tjernlund "Premium" DUCT BOOSTERŪ FAN. Available sizes 6" thru 14". Duct Booster Fan boost air flow in hard to heat or air condition rooms. Can be used as an In-Line Exhaust Fan or for Fresh Air Intake applications. Fits into metal or flexible air duct. Capacities from 280 CFM thru 1480 CFM.
Suncourt 4" Thru 12" INDUCTOR® DUCT BOOSTER FAN Price: $38.75
Suncourt 4" thru 12" IN-LINE DUCT BOOSTER FAN enhances air flow to underperforming air registers in rooms that are too hot or too cold. Capacities from 80 CFM thru 800 CFM. 12 Month Limited Warranty.
Suncourt 5" thru 10" INDUCTOR® 2-SPEED DUCT BOOSTER FAN Price: $41.46
Suncourt 5" thru 10" 2-SPEED DUCT BOOSTER FAN enhances air flow to underperforming air registers in rooms that are too hot or too cold. Capacities from 180 CFM thru 900 CFM. 12 Month Limited Warranty.
Vents-US VKO1 SERIES IN-LINE AIR DUCT Ventilation Fan Price: $31.35
Vents-US VKO1 Series In-Line Air Duct Exhaust Ventilation Fan. Excellent as a Air Duct Booster Fan.
Vents-US COMMERCIAL DUCT BOOSTER FAN Price: $71.78
Vents-US Commercial Grade Air Duct Booster Fan. Galvanized Steel housing with Polymetric coating. High outflow capacity.
Suncourt DUCTSTAT PLUG-IN BOOSTER FAN THERMOSTAT Price: $39.75
Suncourt DS100 PLUG-IN DUCT BOOSTER FAN THERMOSTAT. Simplifies Duct Booster Fan installation. Eliminates electrical connections at the furnace. Duct Temperature Sensing or Wall Mount for ambient Room Control.
SUNCOURT EQUALIZER® EQ2 ROOM REGISTER BOOSTER Price: $33.60
SUNCOURT MODEL HC300 ROOM REGISTER BOOSTER boosts floor register airflow. Pulls extra air out of weak floor registers - increasing airflow by up to 80%.