envelopelearning@mainstreamcorporation.com phone303-912-4833
G4 Filter, MERV 8 - winter filter for supply or exhaust and bypass filter used in summer
F7 Filter, MERV 13 - summer pollen filter for supply only
The ComfoAir 350/550 Filter 10-pack.
The filter replacements are for both the ComfoAir 350/550 ERV and HRV Ventilation Device.
It is recommended to order the filters in quantities of two or more so both filters in the units are replaced at the same time to ensure optimal indoor air quality in the home.
G4 Filter, MERV 8 - winter filter for supply or exhaust, or bypass filter for summer operation.
F7 Filter, MERV 13 - summer pollen filter for supply only.
Mainstream Corporation is a Colorado based Passive House Design, Consulting firm. Specializing in Passive House Products for your building project.
