Air filters in every size
Your exact filter size, delivered when you need it.
Standard and custom sizes, MERV 8 to 13 and carbon, shipped free from four US warehouses.
Free, fast shipping1–2 days to 80% of the US
30-day money-backFull refund on stocked sizes
Every size, even customMade to order when it's not in stock
Rated 4.6 out of 5From 5,243 customer reviews
Most-bought sizes
All sizes and custom →Shop by what your home needs
Not sure which MERV? Start with the problem. Prices are per filter in a 16x25x1 6-pack.
Compare filter quality
| Quality | Captures | Efficiency | Also rated |
|---|---|---|---|
| MERV 8 Standard | Dust, pollen, lint, pet hair | 90% of common particles | FPR 5 · MPR 600 |
| MERV 11 Advanced | + fine dust, pet dander, smoke | 95% | FPR 7 · MPR 1000–1200 |
| MERV 13 Superior | + bacteria and virus carriers | 98% | FPR 10 · MPR 1500–1900 |
| Carbon Odor control | MERV 8 + cooking, smoke and pet odors | 90% | FPR 5 + carbon |
Auto-delivery, if you want it
Never forget a filter change
Choose it on any product page. It's off until you turn it on.
Pick your schedule
Every 1, 2, 3, 6 or 12 months — most 1-inch filters last 60–90 days.
Every 1, 2, 3, 6 or 12 months — most 1-inch filters last 60–90 days.
Save 5% on every delivery
Shipping stays free on every order.
Shipping stays free on every order.
Pause, skip or cancel anytime
No commitment needed.
No commitment needed.
4.6 ★ from 5,243 reviews
"Great filters, fast shipping, wonderful customer service. 10/10 would buy again"Katherine G. · Verified buyer
"I am a new customer and so happy I found Filter King. Their customer service is truly outstanding."Christine D. · Verified buyer
"Great price, quick shipping! Great filters!"Michael F. · Verified buyer
Ships from 4 US warehouses
Most US addresses get their order within 2 business days.
Bulk and business pricing
Most US addresses get their order within 2 business days.