1-Inch Furnace Filters

Every 1-inch furnace filter size Filterflow ships, in MERV 8 and MERV 11. The standard size for most residential furnaces and air handlers, replaced every 1 to 3 months. Subscribe once — a year of filters, free FedEx shipping, and text reminders when it's time to swap.

Need a different depth? See 4-inch filters or 5-inch Honeywell-compatible filters.

Don't see your size? Contact us with the dimensions printed on your current filter's frame, and we'll check whether we can get it for you.

32 products