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Home > Tjernlund Ventilation > Tjernlund Duct Booster Fans > Duct Fan for 12" Flex or Metal Duct 875 CFM

Duct Fan for 12" Flex or Metal Duct 875 CFM

Duct Fan for 12
Duct Fan for 12  Flex or Metal Duct 875 CFMDuct Fan for 12  Flex or Metal Duct 875 CFM
Item #TJE EF-12
AvailabilityUsually ships in 10 business days
Sale Price$245.00


Duct Fan for 12" Flex or Metal Duct 875 CFM
Model EF-12

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
875 800 700 600

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-12 15 3/4 12 1 5/8 4 3/8 2 5/8

Electrical Data:

  • Volts: 115
  • Amps: 1.25
  • Watts: 96
  • HP: 1/35
  • Phase: 1
  • Hertz: 60
  • Open Drip Proof:    Auto
  • Therm. Protection:  Yes
  • RPM: 1550

Warranty:  One year

Duct Fan for 12" Flex or Metal Duct 875 CFM

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