Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
Advertising Disclosure
Furnace Width Sizes of 2025
Save up to 21% off
Best Choice1
Merv KingMervKing 20x20x4 Air Filter | MERV 13 | MPR 1500-1900 Ultra Max | 4-Pack | Pleated HVAC AC Furnace Replacement Air Filters | Actual Size: 19.88" x 19.88" x 4.31"
9.7Exceptional
-
-
Powerful technology We scan thousands of products and stores, analyzing reviews to find what matters most to users like you
Careful review Our team ensures quality, value, and fit based on real user feedback
Trusted insights AI and human analysis guide your decisions, reflecting real user prioritiesReal users impact
Thousands of users trust our site daily
- Based on millions of stores and reviews
- Shoppers influence our rankings
Analyzing top stores
Value for Money2
Merv KingMervKing 16x20x4 Air Filter | MERV 8 | MPR 600-700 Ultra Plus | 6-Pack | Pleated HVAC AC Furnace Replacement Air Filters | Actual Size: 15.88" x 19.88" x 4.31"
9.5Excellent
-
3
FiltreteFiltrete 20x25x4 Slim Fit (3.75" width), AC Furnace Air Filter, MPR 1550, MERV 12, Fits Lennox & Honeywell Devices, Electrostatic Air Cleaning Filter, 2-Pack (actual size 19.50 x 24.50 x 3.75)
21% OffKey specs-
size:20x25x4 SlimFit
-
material:Electrostatically charged filter media
-
usage:Furnace, AC, HVAC
-
special features:Certified asthma and allergy-friendly
-
compatible device:Furnace, AC, HVAC system
9.4Excellent
Our Rating
-
4
FilterbuyFilterbuy 20x25x6 Air Filter MERV 13 Optimal Defense (2-Pack), Pleated HVAC AC Furnace Air Filters for Aprilaire Space-Gard 201/2200 / 2250 & Lennox (Actual Size: 19.75 x 24.25 x 6.00 Inches)
9.3Excellent
Our Rating
-
5
Merv KingMervKing 20x25x5 Air Filter | MERV 11 | MPR 1000-1200 Ultra Pro | 2-Pack | Pleated HVAC AC Furnace Replacement Air Filters | Actual Size: 19.88" x 24.88" x 4.38"
9.0Excellent
-
-
See Today’s Deals & Prices
6
Merv KingMervKing 20x20x2 Air Filter | MERV 8 | MPR 600-700 Ultra Plus | 8-Pack | Pleated HVAC AC Furnace Replacement Air Filters | Actual Size: 19.7" x 19.7" x 1.75"
8.9Very Good
-
7
Merv KingMervKing 20x20x1 Air Filter | MERV 13 | MPR 1500-1900 Ultra Max | 12-Pack | Pleated HVAC AC Furnace Replacement Air Filters | Actual Size: 19.7" x 19.7" x 0.75"
8.7Very Good
-
8
Merv KingMervKing 20x20x1 Air Filter | MERV 11 | MPR 1000-1200 Ultra Pro | 12-Pack | Pleated HVAC AC Furnace Replacement Air Filters | Actual Size: 19.7" x 19.7" x 0.75"
8.4Good
-
9
Merv KingMervKing 20x25x4 Air Filter | MERV 13 | MPR 1500-1900 Ultra Max | 2-Pack | Pleated HVAC AC Furnace Replacement Air Filters | Actual Size: 19.88" x 24.88" x 4.31"
8.2Good
-
10
Merv KingMervKing 20x20x1 Air Filter | MERV 8 | MPR 600-700 Ultra Plus | 12-Pack | Pleated HVAC AC Furnace Replacement Air Filters | Actual Size: 19.7" x 19.7" x 0.75"
8.1Good
-
