Is this the right air filter for you?
If you want to reduce particles in your home that aggravate your allergies, this is the filter for you! Shopping for filters doesn't have to be difficult. We'll delivery quickly to your front door.
- Quality 5" pleated air filter offers improved filtration and longer service life over common 1" filters
- MERV 8 rating means the filter attracts common large household allergens like dust, pollen, and mold spores
- Replaces the ReservePro part # 4531 - nominal size 20x20x5
- Foam gasketing prevents air bypass
- Replace every 6 months under normal use
- Made with pride in the USA
- 100% free shipping and returns on all filters
What does this air filter remove?

What part numbers does this filter replace?
What air cleaners does this filter fit?
- GeneralAire MAC2020
- Source 1 S1-MAC1020205
Do you want to know about the technical specs?
Nominal Dimensions |
20 x 20 x 5" |
Actual Dimensions |
19-11/16" x 20-11/16" x 4-15/16" |
Filter Media |
Electrostatically charged 100% synthetic gradient media that does not support microbiological growth |
Filter Support Grid |
30 gauge galvanized expanded metal grid |
Frame |
Moisture resistant double-wall beverage board |
Max Temperature |
180F (82C) continuous service, peak 225F (107C) |
Max Humidity |
Resistant to 100% R.H. |