4.9 stars · 2,400+ verified orders

Every air filter size,
always in stock

Enter your filter dimensions, choose your MERV rating, and see transparent per-filter pricing across every pack size. No guessing. No wrong orders.

Filter size finder
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Popular filter sizes

All sizes available in MERV 8, 11, and 13. Click any size to see full pricing.

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Why AirFilterVault

Straightforward pricing. Every size in stock.

No membership fees, no confusing bundles. Transparent per-filter pricing on every order.

1,000+ sizes vaulted

Standard and hard-to-find sizes always in stock. If your HVAC needs it, we have it — including precision custom cuts.

Transparent bulk pricing

Volume discounts shown upfront — no coupons needed. A 6-pack beats any hardware store price, guaranteed.

Auto-delivery subscriptions

Choose every 1, 2, or 3 months. Save 5% on every shipment. Cancel any time with no questions asked.

Manufactured in the USA

Every filter built domestically. Consistent dimensions and MERV performance guaranteed on every order.

MERV ratings

Which MERV rating is right for you?

MERV measures filtration efficiency. Higher isn't always better for your system — here's the breakdown.

MERV 8 Standard

90% particle capture

Ideal for most homes. Captures dust, pollen, mold spores, and pet dander without restricting airflow.

Best for: Standard homesNo allergy concernsBudget-conscious buyers
MERV 11 Allergy

95% particle capture

Recommended for homes with pets or mild allergies. Filters fine dust, smoke particles, and more allergens.

Best for: Homes with petsMild allergy sufferersUrban environments
MERV 13 Premium

98% particle capture

Hospital-grade filtration for the home. Captures bacteria, virus carriers, and fine smoke particles.

Best for: Asthma sufferersSevere allergiesPost-wildfire areas
Try the MERV calculator →

Filter guides

Know your filter before you buy

Written by HVAC professionals. The questions most homeowners actually ask.

Maintenance

How often should you change your air filter?

5 min read → Sizing

How to find the right filter size for your HVAC

4 min read → MERV ratings

MERV 8 vs 11 vs 13 — what's the actual difference?

6 min read → Troubleshoot

Why does my air filter turn black so quickly?

3 min read →
All guides →

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Customer reviews

4.9 stars across 2,400+ orders

Verified purchases only.

★★★★★

"Exactly the right size, shipped next day. The 6-pack pricing is genuinely the best I've found — beats Home Depot and Amazon."

Michael T.
16×20×1 MERV 8
★★★★★

"Found my unusual size in stock right away. Set up a 3-month subscription — haven't thought about filters since."

Sandra R.
16×20×5 MERV 11
★★★★★

"The size finder is the best feature. Entered my dimensions, saw the full pricing table, ordered in under two minutes."

Dave K.
20×25×4 MERV 13

Find your filter in 30 seconds

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