Use as an inline filter for your HVAC return or in the filter box of your heater unit.
10x20x1
Ultimate Allergen 1900 performance rating
We have a new HVAC system and this new plastic sealed filter doesn’t fit our new system.
Please ensure that your system uses a 10x20x1 filter before asking. Also, if the listing says “promised” it means somebody else requested it and we’re waiting for them to pick up.