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  • MERV 8 rating-up to 20x more efficient than typical 1" fiber glass filter.
  • Easily fits Aprilaire/Space-Gard models 2200 & 2250.
  • Captures high percentage of household airborne particles, including microscopic particles you can't see.
  • Actual Dimensions: 15.93 x 24.87 x 4.38 in.
You can improve the air quality in your home substantially with Honeywell Whole-House Air Cleaner Filters. It's no secret that today's tightly-built homes trap dust, allergens and many more potentially hazardous contaminates. It's also none too surprising that poor indoor air quality ranks among the top five environmental risks to public health. Honeywell Air Filters (MERV 8 Rating) are 20x more efficient than a typical 1" fiber glass filter, plus they have the added ability of lasting up to one year. Air filters are also easy to install and come in accommodating sizes that fit all Honeywell and many Aprilaire, Space-Gard and Trion Air Bear models. Be certain to measure the filters you are replacing or your filter boot to make sure it's an exact match. Establish an unrivaled breathing experience for yourself and your loved ones with Honeywell and their second to none series of air filters.

MERV = 'Minimum Efficiency Reporting Value' this is used to rate the overall effectiveness of an Air Filter. Below you will find a table that measures the MERV strength and tells you the Application of each unit's effectiveness. In general an Air Filter with a higher MERV Rating is more effective and has a broader application, but most residential homes will find the best use from an air filter between the 5-13 MERV rating.


1 - 4 > 10.0 Micrometers Pollen, dust mites, cockroach debris, sanding dust, spray paint dust, textile fibers, carpet fibers Residential window AC units
5 - 8 10.0 - 3.0 Micrometers Mold, spores, dust mite debris, cat and dog dander, hair spray, fabric protector, dusting aids, pudding mix Better residential, general commercial, industrial workspaces
9 - 12 3.0 - 1.0 Micrometers Legionella, Humidifier dust, Lead dust, Milled flour, Auto emission particulates, Nebulizer droplets Superior residential, better commercial, hospital laboratories
13 - 16 1.0 - 0.3 Micrometers Bacteria, droplet nuclei (sneeze), cooking oil, most smoke and insecticide dust, most face powder, most paint pigments

Ultra residential, best commercial, hospital & general surgery

Product Specs
Furnace Filters for HVAC Systems

If you are interested in ordering a large quantity of items you may qualify for volume pricing discounts. Volume Discount Pricing is a great way for customers to save big on large, bulk orders of most items available in our store. Please send a bulk order request to our friendly sales staff so they may create a quote and provide personal service for your order! You will receive a response within 1-2 business days and our office hours are Monday through Friday, 8am-5pm CST.

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Direct From Warehouse Pricing bulk purchase, wholesale pricing
CF100A1009/U customer reviews

Overall Rating

49 Reviews
49 customers recommend this product
Honeywell Home CF100A1009 4-Inch High Efficiency Air Cleaning Filter 16x25x4.5 Reviews
Earl P
May 26, 2022
Verified Purchase
furnace filters

Shipping was great and filters are working fine.

Valerie D
May 17, 2022
Verified Purchase
Perfect balance for high velocity air

When it comes to filters, there is a fine line between too much that taxes the unit, and not enough to filter the air. I find these filters the perfect balance. Honeywell products are always designed well and this is no exception.

carl & w
May 9, 2022
Verified Purchase
keeps my furnace protected and my house clean

great service and a great product-grand slam!

April 19, 2022
Verified Purchase

Excellent product and fast shipping.

Cynthia W
April 8, 2022
Verified Purchase
Pricey but best quality and less frequent changes

These thick filters are pricey but you don't have to change them as often as the thin ones. They are frequently not available in stores but ordering directly from Honeywell is the same price. They arrived in good condition and the last ones I bought from my local discount retailer was smashed so ordering online is the way to go. There are cheaper brands but Honeywell is by far the best quality.

David P
March 11, 2022
Verified Purchase
Never worry...

I have set these up as a recurring purchase so that I don't even have to think about getting new ones and never worry about the quality.

Mark C
February 15, 2022
Verified Purchase
Works as Claimed

It is a Merv 8. I tried to buy a Merv 10 but was not available. I would have preferred more filtration.

Carol T
February 8, 2022
Verified Purchase
Honeywell Filter

Exactly what I need for my new furnace

Robert K
January 10, 2022
Verified Purchase
Air Filter

Seems to work fine. The whole process of purchasing this was easy and smooth.

George Y
November 10, 2021
Verified Purchase
Air Filters

This has been by far the best way to purchase air filters. We have 2 units at home so purchasing in bulk makes the most sense.

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