Armstrong Air Filters

Buy Armstrong Air Filters, and Armstrong Furnace Filters Armstrong Filter Replacements are a good choice for your HVAC systems as they belong to a well reputed brand. Armstrong is known for its popularity in the industry of furnaces, air handlers, air conditioners and heat pumps. Armstrong AC Filters are considered to be one of its kind in providing excellent air quality. Whether residential or commercial what ever purpose you require a filter for, you will not be disheartened by the performance of Armstrong Furnace filters. There are various models available for Armstrong Air units including: • AE20A-1 • AMC20A-1 • ABS20-1 Armstrong Air Filters block heavy dust particles in the air along with mold spores, dust mites, pollen, pet dander, auto emissions, smoke particles, bacteria, viruses and pollution. They are highly advisable for people who have allergies as they remove allergens from the air and make your indoor environment clean and healthy. Armstrong Air Conditioner Filter provides 98% efficiency in filtering the air. It has an easy installation process which makes it less time consuming to replace once it is clogged with dust particles. Armstrong filters are also available with carbon filter media. They offer high dust capturing ability and have a foam gasket that helps eliminate air breakage. For better results, you must replace your Armstrong filter regularly.

Armstrong Filter Specs

What you need to know about your Armstrong Air Filter

  • Actual Filter Size Vs Nominal Filter Size - (Why this is so important)
  • Filter MERV Ratings - (What is the difference and how does it apply to you?)                              
  • Filter Quality Standards - (Know how to spot a cheap inefficient product)
  • What is your filters model number - (They sure made this a confusing topic but we made it simple) 

Armstrong Filter Dimensions

It works like this

The Armstrong Filter System comes in various sizes that are described in two ways.

  • Nominal Filter Dimensions - This is equal to the actual dimensions rounded up or sometimes down
  • Actual Filter Dimensions - These are the actual filter dimensions if you were to use a measuring tape and manually measure the filter.


Armstrong Filter Sizes

Armstrong Air Filter 20x25x5 | (19.75 x 24.25 x 4.75)

Why is double checking your filters actual dimensions so important?

Because people accidentally order the wrong Filter Size all the time and it is not their fault.

Air filter manufacturers did not make cross referencing filter sizes easy and when the wrong size is ordered, the filter will not fit in your Armstrong Filter Housing, or Armstrong Filter Box.

Furnace Filter Depot Online Store

Welcome to Furnace Filter Depot's online store.

Furnace Filter Depot in Orlando, Florida, offers the best in furnace filters and HVAC filters to improve your home's air quality. We offer a wide selection of air filters for furnaces, heating systems, and air-conditioning systems of every variety. We have been distributing air filters for HVAC systems across the country since 1974.

Please feel free to contact us if you have questions about our products, or if you are looking for something specific. Call us today at (786) 310-4863 or email us at