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21.5x27.5x5 Air Filter Merv 8 21.5x27.5x5 Air Filter Merv 8
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21.5x27.5x5 Filter Merv 8 Carbon 21.5x27.5x5 Filter Merv 8 Carbon
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Honeywell 21.5x27.5x5 Air Filters

Replacement Filter for Model Honeywell FC100A1045

Actual Size: 21.25 X 27.25 X 4.38

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Product Description

Item Model Number: FKDPFW21.5X27.5X5
21.5x27.5x5 (21.25 x 27.25 x 4.38) FC100A1045 MERV 8 Filter King Replacement Filter for Honeywell

Manufactured in the US

Why Buy Air Filters From Filter King?


In comparison to fiberglass filters, 21.5x27.5x5 pleated air filters are at least 20 times more effective. All Filter King air filters are made in the US.


Filters frames are made out of heat resistant paperboard with horizontal grid supports. Able to withstand temperatures of up to 200° F and resistant to moisture, the paperboard frames do not support microbial growth and outperforms traditional cardboard frames.


Chemical free, electrostatically charged synthetic polyester media is pleated, maximizing the surface area, to capture a high number of airborne particles as small as 0.3 microns with low air flow resistance. To increase durability, the media is supported with a corrosion resistant steel wire.

21.5x27.5x5 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 21.5x27.5x5 Air Filter?

Filter King AC & furnace filters aren’t the typical fiberglass filters that need to be replaced every 30 days. Our filters can typically be used for 3 to 5 months before requiring to be changed. Naturally, a variety of things influence filter lifespan.

Some of the factors that influence your filter’s life include outdoor air quality, whether pets are in the home, and how well your HVAC system is maintained.

Your air filter becomes clogged over time by trapped particles, preventing airflow. The efficiency of the HVAC filter declines. Your system must work harder to heat and cool your home. The extra strain on the HVAC system causes higher energy bills. Regular home air filter replacements can prevent expensive system repairs or replacements down the road.

You should change your filter more frequently if you notice:

  • Household dust build-up
  • The air isn’t cooling as is used to
  • There’s more dust near the air vents
  • A dirty filter surface
  • Higher energy bills
  • Burning smells near your HVAC system.

This is a replacement filter for the Honeywell® FC100A1045 / 203720.

The FC100A1045 filter is designed to be used in the following applications:

FC100A series air purifier, including models FC100A1044 and FC100A1052

Filter Specifications:

- Nominal size - 21.5" x 27.5" x 5"

- Actual size - 21 1/2" x 27 3/4" x 4 3/4"

- Frame Type: Die Cut Finger Joint, Double Wall

Improve your indoor air quality with this Honeywell® filter. This high-quality, cost-effective filter has all the benefits of an OEM part without the high price tag. Designed to maximize airflow while protecting your family. Enhance indoor air quality by removing dust and other contaminants from your home's air with this FC100A1045 replacement filter.