30x36x1 MERV 11 Furnace & AC Air Filter
The 30x36x1 (actual size 29.5 × 35.5 × 0.75 in) in MERV 11 — captures everything MERV 8 does plus pet dander, fine dust and smog particles. Best for homes with pets or mild allergies. Below: the true dimensions, when to change it, and how this MERV compares to the others that fit the same slot.
Same size, other MERV ratings
All fit your 30x36x1x1 slot — step up for finer filtration, down for easier airflow.
Measured your slot? Other depths
Depth must match your filter slot exactly. Same 30x36x1 face, different thickness.
Frequently asked questions
What is the actual size of a 30x36x1 air filter?
A 30x36x1 is the nominal size printed on the frame. The true measured size is about 29.5 × 35.5 × 0.75 in, cut slightly under so the filter slides into the 30x36 slot. This is standard across all brands.
What does MERV 11 filter out?
MERV 11 captures everything MERV 8 does plus pet dander, fine dust and smog particles. It's best for homes with pets or mild allergies. On the box you may see it labelled MPR ~1000–1200 (3M/Filtrete) or FPR 7 (Home Depot).
How often should I change a 30x36x1x1 filter?
Change it every 60–90 days. A 1" filter clogs quickest, so check it monthly. A clogged filter strains your blower and raises energy bills.
Will a 30x36x1x1 filter fit my furnace?
Air filters are universal by size — any furnace, AC or return grille that takes a 30x36x1x1 filter will fit this one, regardless of the HVAC brand. Just match the three numbers on your old filter's frame exactly, depth included.