16x16x4 MERV 8 Furnace & AC Air Filter
The 16x16x4 (actual size 15.5 × 15.5 × 3.75 in) in MERV 8 — captures pollen, dust, lint, dust-mite debris and mold spores. Best for everyday home use — the standard choice to protect your HVAC system. 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 16x16x4x4 slot — step up for finer filtration, down for easier airflow.
Measured your slot? Other depths
Depth must match your filter slot exactly. Same 16x16x4 face, different thickness.
Frequently asked questions
What is the actual size of a 16x16x4 air filter?
A 16x16x4 is the nominal size printed on the frame. The true measured size is about 15.5 × 15.5 × 3.75 in, cut slightly under so the filter slides into the 16x16 slot. This is standard across all brands.
What does MERV 8 filter out?
MERV 8 captures pollen, dust, lint, dust-mite debris and mold spores. It's best for everyday home use — the standard choice to protect your HVAC system. On the box you may see it labelled MPR ~600 (3M/Filtrete) or FPR 5 (Home Depot).
How often should I change a 16x16x4x4 filter?
Change it every 6–12 months. A 4" filter holds more dust and lasts longer, but still check it periodically. A clogged filter strains your blower and raises energy bills.
Will a 16x16x4x4 filter fit my furnace?
Air filters are universal by size — any furnace, AC or return grille that takes a 16x16x4x4 filter will fit this one, regardless of the HVAC brand. Just match the three numbers on your old filter's frame exactly, depth included.