Is MERV 13 too restrictive for my furnace?

MERV 13 at 0.35 in wc is on the low-resistance end for that rating, so most modern systems handle it. Older furnaces or systems with tight ductwork may lose airflow; check your blower's static pressure spec or ask an HVAC tech.

What size is it really?

The nominal size is 24x30x2, but the actual size is about 23 1/2 x 29 1/2 x 1 3/4 inches. Measure your filter slot before ordering, since a true 24x30 opening may not fit.

How often should I change it?

Aerostar and most HVAC guidance suggest every 60 to 90 days. With a 6-pack, that is roughly a year of filters. Change sooner if you have pets or heavy dust.

Does it filter viruses and bacteria?

MERV 13 captures a large share of particles in the 0.3 to 1 micron range, which includes many virus and bacteria carriers. It is not a HEPA filter, so it reduces airborne particles rather than sterilizing the air.

Is the 6-pack a good price?

At $80.73 for six at AeroStar as of November 7, 2026, that is about $13.46 per filter. Compare against single MERV 13 filters at your local store before buying the pack.

Will it fit my brand of furnace?

Aerostar says it is compatible with most furnace and AC brands. Fit depends on the cabinet dimensions, not the brand, so confirm your slot takes a 23 1/2 x 29 1/2 x 1 3/4 inch filter.