Actual dimensions are 19.88 x 24.88 x 4.38. Brand: Accumulair. 20x25x5 Honeywell FLR3420 replacement whole house filters, specifically designed to substitute for the original manufacturer Honeywell FLR3420 filters. Completely box-formed - no forming or combs needed. MERV graded to ASHRAE 52.2 test ratings establishing particle filtration as good or better than the original manufacturer Honeywell FLR3420 air filter. Note: Sample air filter image as shown is not true to size and is shown for design purposes. Name brands and Honeywell FLR3420 part numbers are included for air filter replacement identification use.
Shipping and Returns
- Lead times vary and are listed at the top of the website. Non-standard sizes (custom, 0.5" thick, etc) take 3-4 weeks for delivery.
- Shipping is FREE to the contiguous United States.
- 30-day 100% return policy.
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.