Three quick questions about your HVAC system and household — one precise recommendation for dust, allergies, or pet odor, sized to fit and ready to order.
We'll ask for your size and household conditions — pets, allergies, or everyday dust — and turn it into a specific recommendation for cleaner indoor air, plus a direct link to buy it in the right size.
Captures pet dander, mold spores, and most allergens without restricting airflow.
Opens Amazon search results filtered to your exact size and MERV rating.
Redirecting you to the exact size and rating you need...
Every HVAC system uses a specific filter size — printed on the cardboard edge of your old filter. Here's what the most-searched sizes are typically used for, so you can double-check before you order.
One of the most common sizes in single-family homes with standard 1-inch furnace slots.
Common in larger homes and central air systems with higher airflow needs.
Frequently used in apartments, condos, and homes with wall or ceiling return vents.
A thicker, higher-capacity filter used in systems with a dedicated filter cabinet.
MERV (Minimum Efficiency Reporting Value) measures how well a home air filter traps particles, on a scale of 1–20. Higher isn't always better — a rating too high for your HVAC system can restrict airflow and strain the blower motor.
For most homes, MERV 8–11 balances clean indoor air with airflow, handling everyday dust, pollen, and pet odor. MERV 13 approaches HEPA-level filtration and is best reserved for allergy, asthma, or smoke-sensitive households — and only if your system is rated to handle it.
| Rating | Best for | Change every |
|---|---|---|
| MERV 8 | Standard homes, dust & pollen | 90 days |
| MERV 11 | Pets, mild allergies | 60–90 days |
| MERV 13 | Allergies, asthma, smoke | 60 days |
Every 60–90 days for most 1-inch filters, more often with pets or during high-pollen seasons. A dirty filter restricts airflow and makes your system work harder.
Enter your exact dimensions in the custom size field — custom sizes are common in older homes, and dedicated filter retailers can cut to size where standard retailers can't.
Turn off your HVAC system, remove the old filter, insert the new one with the arrow pointing toward the system, then turn it back on.
Not on its own. A rating higher than your HVAC system is designed for can restrict airflow and reduce efficiency. Match the rating to your system, not just the highest number available.
Check the cardboard edge of your current filter — the size is printed there as three numbers, like 20x25x1. If you can't find your old filter, measure the width, height, and depth of the slot where it sits (round up to the nearest inch).
No — filter thickness (the third number, like the "1" in 20x25x1) is sized to the exact depth of your filter slot. A thicker filter usually won't fit, and forcing one in can damage the door or seal.
MERV 8 covers general household dust for most homes. MERV 11 adds pet dander and mold spore capture. MERV 13 is for allergy, asthma, or smoke-sensitive households — but confirm your HVAC system supports it first, since higher ratings restrict airflow more.
Yes — a MERV 11 filter is the typical sweet spot for pet households, trapping dander and airborne odor particles without over-restricting airflow. For heavy dust or multiple pets, MERV 13 offers stronger capture if your HVAC system supports it.
Not quite. True HEPA filters capture 99.97% of particles but are too dense for most home HVAC systems. MERV 13 is the closest home-compatible option, offering HEPA-level filtration for allergens and smoke without the airflow restriction of true HEPA.