Best Glasfloss Furnace Filters in 2026

Nominal size: 20x20x4; Actual size: 19 1/2"x19 1/2"x3 3/4"; This MERV 11 filter is comparable with MPR 1000-1200 & FPR 7.

Designed to filter microscopic particles such as lint, dust mites, spores, pollen, pet dander, fine dust, and smoke. Made with electrostatically charged synthetic material for high filtration efficiency with low air flow resistance

Simple to install and a cost-effective step towards a healthier home environment. Replace 3"-5" filters every 3-6 months.

16x25x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 15.50" x 24.50" x 0.75")

MERV 8 synthetic media (comparable with MPR 600 & FPR 5) protects homes from dust, pollen, and more by trapping 90% of airborne particles without impacting air flow

High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products lifespan by 3 times that of fiberglass models

Nominal Size: 19 7/8 x 21 1/2 x 1 ; Actual Size: 19 7/8" x 21 1/2" x 3/4"

Comparable to MPR 1000 to 1200 Micro Allergen Defense and Honeywell Allergen Plus FPR 7

Designed to filter microscopic particles such as lint, dust mites, spores, pollen, pet dander, fine dust, and smoke

Actual Size: 19.5” x 19.5” x 3.75” | Nominal Size: 20x20x4

MERV 10 Efficiency with MERV 8 Air Flow (.25" W.C.)

Air Filters for homes, business, schools, apartments, hotels and industrial.

Actual Size: 21 1/2 x 23 5/16 x 7/8 (21.5 x 23.3125 x .875) | Nominal Size: 21 1/2 x 23 5/16 x 1

Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR rating 5 to 6.

Improved MERV 10 Filtration with similar air flow and resistance as a MERV 8 filter.

Nominal Filter Size 20 x 20 x 1

Actual Filter Size 19.5" x 19.5" x .875"

Merv 8 Performance

Actual Size: 19 7/8 x 21 1/2 x 7/8 (19.875 x 21.5 x .875) | Nominal Size: 19 7/8 x 21 1/2 x 1

Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR rating 5 to 6.

Affordable high quality replacements for Carrier, Payne, or Bryant 19 7/8" x 21 1/2" x 1" air filters.

Nominal Filter Size 20 x 25 x 1

Actual Filter Size 19.5" x 24.5" x .875"

Merv 8 Performance

Exact Size: 19.5” x 24.5” x 1.75” | Nominal Size: 20 x 25 x 2

Frame is durable and sturdy with galvanized metal backing.

MERV 10 Filtration Efficiency with similar MERV 8 Air Flow & Pressure drop.

Turn your HVAC system into a whole home air purification system by replacing your 20x25x1 disposable filter with the high efficiency polarized media Wingman1. (actual size 19 3/4" x 24 5/8" x 1" - including power channel)

Captures over 97% of airborne particles .25 micron and larger- including Pollen, Household Dust, Pet Dander and Cooking Smoke.

Take control of your home’s indoor air quality this year with the high efficiency Wingman1 and breathe clean air!

Actual Size: 16 3/8 x 21 1/2 x 7/8 (16.375 x 21.5 x .875) | Nominal Size: 16 3/8 x 21 1/2 x 1

Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR rating 5 to 6.

For optimal performance, recommended to change at least every 3 months.

Nominal Filter Size 20 x 24 x 2

Actual Filter Size 19.375" x 23.375" x 1.75"

Merv 8 Performance

Breathe In Clean Air - Maintain excellent air quality in your living space with these MERV 6 air filters.

Maintain Optimal Air Flow - Help your HVAC system function at its best each day. Measuring 20x30x1", our replacement HVAC filters without restricting airflow.

A Snug & Seamless Fit - Our thick furnace filter pads will easily fit most vents with standard dimensions. You may also cut down the filtration media to your preferred size using a pair of scissors.

Nominal Filter Size 16 x 16 x 2

Actual Filter Size 15.5" x 15.5" x 1.75"

Merv 8 Performance

MERV 10 Efficiency with MERV 8 Air Flow

Heavy Duty Construction

Galvanized Expanded Metal Backing, Each Filter is Individually Bagged

Merv 8 Pressure Drop & Air Flow with upgraded MERV 10 filtration

Actual Size: 15-1/2 x 24-1/2 x 3-3/4 | Nominal Size: 16x25x4

Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR rating 5 to 6.

Air Flow is comparable to a MERV 8 rated filter. Made in the USA. Ideal for residential and commercial use.

Merv 10 Performance, comparable to MERV 8 air flow.

Nominal Size: 20x22x1 | Actual Size: 19-1/2 x 21-7/8 x 7/8 | 1 Inch Depth Filter

Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR rating 5 to 6.

Air Flow: Comparable to MERV 8. Durable & Long Lasting: Heavy duty frame won't buckle.

MERV 11 AIR FILTER 20x25x6 – Filters Fast Air Filters meet the same quality standards as the name brand filters and we back our 20x25x6 filter with a MERV RATING 11. We are a member of NAFA, The National Air Filter Association. Be wary of cheap filters.

COMPATIBLE WITH – These 20x25x6 air filters MERV 11 are the compatible replacements for Aprilaire Space Gard 2200, compatible replacement for GlasFloss hvp20256.

ENHANCE THE AIR QUALITY IN YOUR HOME – The premium MERV 11 rating Filters Fast filters will help with overall air quality while also helping to extend the life of your heating and cooling system.

Actual Size: 19-1/2 x 19-1/2 x 3-3/4 | Nominal Size: 20x20x4

Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR rating 5 to 6.

Air Flow is comparable to a MERV 8 rated filter. Made in the USA. Ideal for residential and commercial use.