Filterbuy · Furnace & AC Filters

Filterbuy air filters by size

US-made pleated filters across MERV 8/11/13 and every common size, with subscription options. Pick your size below — air filters are universal by dimension, so any Filterbuy filter in your size fits your system.

Popular Filterbuy sizes

Jump to your size for all MERV options, or grab Filterbuy directly.

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All sizes

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Filterbuy MERV ratings

Filterbuy lists filtration on the MERV scale. Here's what each MERV level does.

MERV 8

Standard protection

Captures pollen, dust, lint, dust-mite debris and mold spores. Best for everyday home use — the standard choice to protect your HVAC system.

MERV 11

Allergy & pet

Captures everything MERV 8 does plus pet dander, fine dust and smog particles. Best for homes with pets or mild allergies.

MERV 13

Maximum filtration

Captures everything MERV 11 does plus smoke, bacteria and virus-carrying particles. Best for allergy and asthma sufferers, and homes dealing with wildfire smoke.

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