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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 & 2251.
  • Captures high percentage of household airborne particles, including microscopic particles you can't see.
  • Actual Dimensions: 19.94 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.

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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  • Our warehouse ships directly to you.
  • You enjoy the savings & are now a preferred customer.
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Direct From Warehouse Pricing bulk purchase, wholesale pricing
CF100A1025/U customer reviews

Overall Rating

41 Reviews
40 customers recommend this product
Honeywell Home CF100A1025 4-Inch High Efficiency Air Cleaning Filter 20x25x4 Reviews
Tyler C
July 6, 2022
Verified Purchase

Love the bulk deal and very quick delivery

May 2, 2022
Verified Purchase
Merv 8 Filter Review

Terrific filter, highly recommended!!!

Linda S
March 17, 2022
Verified Purchase
Easy to use!

So much better than the old type we had to weave around a bracket.

Virginia P
October 4, 2021
Verified Purchase
A/C Filter

I have used these filters for many years in my air conditioner. They are a quality product living in Florida, they have to be good as they get used almost every day! A quality product and easy to order direct from Honeywell.

Kathleen F
July 20, 2021
Verified Purchase
Upgrade to the Best

Our HVAC technician recommended that we use Honeywell's four-inch high efficiency air filter, pointing out that the space in our system called for this deeper filter. Who knew? For years we were using the 1-inch. Delivery was very prompt, fit is perfect and we are breathing healthier!

Patti J
July 9, 2021
Verified Purchase
Honeywell Air Filter

I was very satisfied with ordering process and the Honeywell air filter. It was my first purchase and I will definitely order from them going forward.

Tyler C
June 4, 2021
Verified Purchase

Very happy with price and product!

May 7, 2021
Verified Purchase
Title OK

Product delivered in a timely manner and product I ordered. Thank you for the quality service.

Rose Burckhardt
August 27, 2020
Verified Purchase
Fits Just Fine

Delivery was very fast and the filter fits just fine.

Itay Kama
August 13, 2020
Verified Purchase

very good

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