We help you nail size before day one.
Most negative filter experiences trace back to fit, not MERV. Use Fit Check before checkout.
Fit check
Measure your existing filter width × length × depth in inches. We suggest the closest common nominal size.
Example: nominal 16x25x1 often measures around 15.5 x 24.5 x 0.75 in actual size.
Fit guarantee (demo policy)
If you ordered the nominal size we recommended after Fit Check and the filter does not seat securely, contact support within 30 days for replacement or refund verification.
Deep 4-inch media and uncommon sizes may require manual review before shipping.
FAQ.
Quick answers shoppers ask before clicking add to cart.
Nominal is the rounded label. Actual is the frame measurement from manufacturer specs or your tape measure. Always buy to actual slot dimensions.
Typical 1-inch pleated filters are around 90 days. Pets, pollen, or heavy dust often need 60-day replacements.
It can increase static pressure versus MERV 8. If airflow drops, step down a level or confirm system compatibility with an HVAC technician.