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Home > Tjernlund Ventilation > Tjernlund Duct Booster Fans > Duct Fan for 8" Flex or Metal Duct 325 CFM

Duct Fan for 8" Flex or Metal Duct 325 CFM

Duct Fan for 8
Duct Fan for 8  Flex or Metal Duct 325 CFMDuct Fan for 8  Flex or Metal Duct 325 CFM
Item #TJE EF-8
AvailabilityUsually ships in 10 business days
Sale Price$119.00


Duct Fan for 8" Flex or Metal Duct 325 CFM
Model EF-8

Made in the USA!

Duct Booster fans boost air flow and increase the comfort level in hard to heat or cool rooms. Eliminates the need to adjust the thermostat or install auxiliary heating or cooling equipment. Fans can also be used for exhaust or fresh air intake applications. Fits into metal or flex duct.

Used as a means of increasing air flow through duct work or as an exhaust fan to vent non-combustible air or fumes from enclosed spaces. The maximum air flow operating temperature for the EF-Series is 150 F. (65 C.)


  • Boost air flow in hard to heat or cool rooms
  • Easy installation in both metal and flex duct
  • Quiet smooth operation
  • Heavy gauge housing
  • Better performance, higher velocity (works against higher pressure drops)
  • High temperature rating (150F)
  • Download the Installation Instructions
Duct Booster Fan
Outdoor Air Supply
Lunchroom Exhaust
Spot Ventilation
Soldering/Welding Exhaust
Bathroom Exhaust
Warehouse/Pole Barn Exhaust

Duct Booster Fan
Outdoor Air Supply
Bathroom Exhaust
Spot Ventilation
Crawl Space Exhaust


  Duct Length in Feet

Maximum Air Temp Degrees F

Free Air CFM 25 Feet CFM 50 Feet CFM 75 Feet 150F
180 300 250 200

Table is based on straight metal duct. 90 degree elbows are equivalent to 10 feet of straight duct. Performance is based on 70 degrees F standard air.


Model Unit Dimensions (inches)
EF-8 9 8 1 5/8 4 3/8 2 5/8

Electrical Data:

  • Volts: 115
  • Amps: 1.1
  • Watts: 56
  • Phase: 1
  • Hertz: 30
  • Open Drip Proof:  Auto
  • Therm. Protection:  Yes
  • RPM: 3000

Warranty:  One year

Question: Do you have a 325cfm duct fan in 6 andor can I use a 6 outside vent to end an 8 duct fan run? How much noise does it make in the wall?
Answer: On the Duct fan model EF-8 you can use a 6 inch outside vent, but that will reduce the air flow rate of the fan. So this fan would not be moving 325 cfm. The fan operates at a minimal sound level.
Question: What type of bearings? Can they be lubricated? Thank you.
Answer: The 8 Inch Duct Fan has sealed bearing so no lubrication is needed.
Duct Fan for 8" Flex or Metal Duct 325 CFM

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