Duct Fans are energy efficient, simple to mount as a connector in-between two ducts to work as an inexpensive way to increase air pressure and boost air flow where increase air ventilation is required. Flip a switch and duct booster fan pushes the hot or cold air to go to where you direct it. Equilize room temperature at the touch of a button. Used in place of a centrifugal blower, these axial flow fans are inserted in the same space as a connector.  These duct fans can also be used as attic duct fans.

Installs easily in metal or flexible ducts
Boost airflow of duct booster fans for air ducts. Assist ventilation to selected areas quickly and quietly equalizing temperature.
Use as a super quiet "room to room" or bathroom exhaust fan

DB 204	4" Diameter metal or flexible ducts. Balanced Aluminum fan blade                    Boosted CFM: 80 Free Air CFM: 40 Amperes: 0.30 Running Watts: 30 Volts: 120 Qty  Price: $49.80each
Built for US Navy Heavy Duty Tube Axial Fan	Itemcode # 756-2928 Housing- Cast Aluminum  Tube Diameter- 4-3/4" Motor- HP 1/100 DC Series Wound  Volts- 27 Amps- 0.70 RPM- 7000 Dim - 6" W x 6" D x 6-1/2" W Wt. 3.0 lbs. can produce up to 95 CFM New Surplus Qty  Price: $79.80each
DB 205	5" Diameter metal ducts. Balanced Valox fan blade. Boosted CFM: 225 Free Air CFM: 140 Amperes: 0.35 Running Watts: 30 Volts: 120 Qty  Price: $50.80each
DB 206	6" Diameter metal ducts. Balanced Lexan fan blade Boosted CFM: 250 Free Air CFM: 160 Amperes: 0.35 Running Watts: 30 Volts: 120 0.06" Static Pressure Qty  Price: $57.90each
DB 208	8" Diameter metal ducts. Balanced Aluminum fan blade Boosted CFM: 500 Free Air CFM: 210 Amperes: 0.75 Running Watts: 60 Volts: 120 Qty  Price:$59.90 each
DB 210	10" Diameter metal ducts. Balanced Aluminum fan blade Boosted CFM: 650 Free Air CFM: 300 Amperes: 1.5 Running Watts: 120 Volts: 120 Qty  Price: $66.00 each
DB 212	12" Diameter metal ducts. Balanced Aluminum fan blade Boosted CFM: 800 Free Air CFM: 650 Amperes: 2.8 Running Watts: 170 Volts: 120 Qty Price:$79.00each

Ratings stated are from equivalent items advertised and are not test results from these units.

see Ducts
see Duct accessories elbows pipe and tees
see Duct Connectors
see fans Broan Nutone
see fans compact square frame
see fans compact round frame
see fans for In-Line Duct mounting