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Air Filter
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MFAS Fresh Air Supply

  • MFAS: 50 / 80 CFM


Air King’s MFAS fresh air supply unit offers home builders and developers a cost effective mechanical fresh air solution. Contractors and builders now have a practical offering for introducing constant fresh air from outside into the residence, meeting the ASHRAE 62.2 fresh air CFM requirements. The operator simply dials in the quantity (CFM) of fresh air needed from the fan’s control panel. The unit includes a mesh filter to capture larger debris such as bugs and leaves while an option air filter (up to a MERV16) can be added to enhance the air quality of the home (air filters sold separately). The MFAS works independent of the HVAC system and it’s compact size allows it to be mounted in basements, attics, closets, laundry rooms and more. The 6 inch duct connections allow for longer duct runs and the unit is perfect for single family or multi-family projects. The MFAS has 2 HVI Certified CFM settings of 50 or 80 CFM and is ETL listed.


  • Fully assembled, screw it to the wall, connect power & ductwork, you’re ready to go
  • Inexpensive first cost method to bring in fresh air using an independent fan
  • No connection to HVAC system required
  • Compact design fits nearly everywhere
  • Mount in basement, attic, equipment closet, garage, laundry room, etc.
  • 6″ round duct connections for virtually unlimited duct length
  • Suitable for single & multi-family projects

Choose the desired airflow 50 or 80 CFM, Turn it On

Includes easy access test port and unit mounted airflow chart


  • Excellent ASHRAE 62.2 solution for fresh air (learn more)
  • HVI Certified performance
  • ETL listed


  • Nearly silent operation, homeowner may not even know it is operating
  • Accepts 9″ x 8″ x 2″ MERV16 filter through easy access filter door
  • Unit mounted “off” switch
Models MFAS
Specification Sheet Download MFAS
CFM Settings @ 0.2″ SP 50, 80
Sones N/A
Sound Level Very Quiet
Maximum Fan Watts 82.9
ASHRAE 62.2 Ventilation Fresh Air Supply
ENERGY STAR® certified No
Can be used to Comply with California Title 24 requirements N/A
CALGreen N/A
Duct Size 6″ round
Collar Metal
Mounting Mounting Bracket
Housing Metal

What is included with the unit?

Insulated 26 gauge galvinized steel housing

Blower (motor)

Hanger brackets for surface mounting

Duct collars

User manual

Suggested Accessories (available separately)

9″ x 8″ x 2″ MERV13 air filter

Motorized Damper

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