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Armstrong 20x25x5

Armstrong 20x25x5

Actual: 19.75 x 24.25 x 4.75
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Keep your HVAC system performing at its best with our aftermarket replacement filters for Armstrong. Designed as a high quality replacement for compatible Armstrong systems, these deep pleated 5 inch air filters provide excellent dust holding capacity, long service life, and reliable airflow while helping capture dust, pollen, pet dander, mold spores, and other common airborne particles. Proudly made in the USA and available in multiple MERV ratings, our replacement filters offer a dependable, cost effective solution for maintaining cleaner indoor air and protecting your HVAC system.

Filter Details

Product specifications and sizing information.

Nominal Size: 20x25x5

Actual Size: 19.75 x 24.25 x 4.75

Manufactured in the USA using high quality filtration media and durable beverage board frames.

MERV Rating Guide

Learn what MERV ratings mean and choose the right level of filtration for your home.

In simple terms, the higher the MERV rating, the smaller the particles the filter can trap. Higher MERV filters can help improve indoor air quality by capturing more dust, allergens, and microscopic particles moving through your HVAC system.

Choosing the right MERV rating depends on your home, allergies, pets, air quality concerns, and HVAC system compatibility.

MERV 10

Great for everyday residential filtration and standard home use.

  • Dust and lint
  • Pollen
  • Pet dander
  • Mold spores
  • General household debris

MERV 10 filters offer an excellent balance of airflow and filtration performance for most homes.

MERV 11

Enhanced filtration for homes with pets, allergies, or higher indoor air quality needs.

  • Dust and pollen
  • Pet dander
  • Mold spores
  • Fine household particles
  • Some smoke and smog particles

MERV 11 filters are a popular upgrade for homeowners looking for cleaner indoor air without significantly restricting airflow.

MERV 13

Advanced residential filtration for superior indoor air quality.

  • Fine dust particles
  • Smoke and smog
  • Bacteria carriers
  • Microscopic allergens
  • Some virus carrying particles

MERV 13 filters provide hospital grade level filtration performance for residential HVAC systems and are ideal for allergy sufferers, pet owners, and homes with higher air quality concerns.

Always verify your HVAC system can support higher efficiency filtration before upgrading to a MERV 13 filter.

Shipping & Delivery

Information about fulfillment and shipping.

Orders ship from our Clearwater, Florida warehouse.

Most orders ship within 1 business day.

Free shipping is included on all filter orders.

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Which MERV Rating Is Right For You?

Helps capture
MERV 10 air filter MERV 10
MERV 11 air filter MERV 11 Most Popular
MERV 13 air filter MERV 13
Dust, Lint & Debris ✓ ✓ ✓
Pollen & Mold Spores ✓ ✓ ✓
Pet Dander ✓ ✓ ✓
Smoke Particles × ✓ ✓
Bacteria Carriers × × ✓
Virus Carriers × × ✓

MERV 10

Good for everyday homes focused on dust, pollen, and airflow.

MERV 11 Most Popular

The best balance of filtration and airflow for most households.

MERV 13

Maximum residential filtration for allergies, smoke, and indoor air quality.

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