20×20×5 air filter
Fits any system that takes a 20×20×5 filter. Actual size 19.75 × 19.75 × 4.75 inches, made to within 1/16 inch and measured before it ships. Made in the USA. Free shipping; you see your arrival date before you pay.
Grades and prices
| Grade | What it catches | Price per filter |
|---|---|---|
| Everyday (MERV 8) | Dust, lint and pollen. The right pick for most homes. | 4-pack $21.61 each, 6-pack $16.50 each, 12-pack $15.51 each |
| Allergy (MERV 11) | Adds pet dander and mold spores. For pets and allergy season. | 4-pack $30.26 each, 6-pack $23.10 each, 12-pack $21.71 each |
| Allergy + Smoke (MERV 13) | Adds smoke, smog and fine particles. For wildfire season and asthma. | 4-pack $33.50 each, 6-pack $25.57 each, 12-pack $24.04 each |
Subscribe and save 10%. Choose When you need it, timed to your local weather, air quality and household and billed per box, or Every few months, a box every 3, 6 or 12 months. Skip, change or cancel anytime.
Dimensions
- On the label
- 20 × 20 × 5 in
508 × 508 × 127 mm - Actual filter
- 19.75 × 19.75 × 4.75 in
502 × 502 × 121 mm - Face area
- 2.78 sq ft
0.26 m²
Where this size goes
In the 1,116 furnace and air handler models we've sized from manufacturer spec sheets:
- 3 air handlers take a 20×20×5 in the unit or its filter stand (Lennox).
Examples: Lennox CBX40UHV-024, Lennox CBX40UHV-030, Lennox CBX40UHV-036. Look up your model.
How often to change it
| Household | Everyday (MERV 8) | Allergy (MERV 11) | Allergy + Smoke (MERV 13) |
|---|---|---|---|
| A typical home | 8 months | 8 months | 6.5 months |
| With pets | 5 months | 5 months | 4.5 months |
| Pets and allergies, or smoke season | 4 months | 4 months | 3 months |
A 5" filter has far more pleat surface than a 1" filter, so it lasts much longer. Heating and cooling season, pollen and wildfire smoke shorten these; mild spring and fall weeks stretch them. More on timing.
How long a pack lasts
| Pack | Typical home | With pets | Everyday, a month |
|---|---|---|---|
| 4-pack | 31 months | 20 months | $2.79 |
| 6-pack | 47 months | 30 months | $2.11 |
| 12-pack | 94 months | 61 months | $1.98 |
On a subscription we send each box when your home needs it, so you never store more than you use.
Questions about 20×20×5 filters
Is 20×20×5 the real size?
Not quite, and that's normal. 20×20×5 is the size on the label. The filter itself measures 19.75 × 19.75 × 4.75 in (502 × 502 × 121 mm), a little smaller so it slides into the slot. We make ours to within 1/16 inch of that.
How much does a 20×20×5 filter cost?
In a 6-pack, Everyday (MERV 8) is $16.50, Allergy (MERV 11) is $23.10, Allergy + Smoke (MERV 13) is $25.57 per filter. A 12-pack costs a little less per filter, and subscribing saves another 10%. Free shipping in the US.
How often should I change a 20×20×5 filter?
About every 8 months in a typical home with Everyday or Allergy, and every 6.5 months with Allergy + Smoke. With pets, closer to every 5 months. Heating and cooling season, pollen and smoke fill it faster, so "When you need it" times each swap to your home's weather and household instead of the calendar.
Will a 20×20×1 fit where my 20×20×5 goes?
A 1" filter is thinner, so it would slide in but leave a gap that lets air go around it. Stay with 20×20×5 for a 5" cabinet.
What if it doesn't fit?
Tell us within 30 days and we'll send a new one free, and you keep the first. That's our fit guarantee.