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  • MERV 10 Rating - Up to 20 Times More Efficient Than Typical 5 Inch Pleated Filter.
  • Fits Trane or American Standard Perfect Fit.
  • Captures High Percentage of Household Airborne Particles, Including Microscopic Particles You Can't See.
  • Consumer No Longer Has To Wait For HVAC Rep To Replace Filter.
  • Lasts Up To Six Months.
  • Replacement filter for BAYFTAH21M.
  • Actual Dimensions (Inches): 20.75 x 20 x 5
The Honeywell TRN2121R1/E High Efficiency Air Cleaner Filter is designed for Trane or American Standard Perfect Fit. Featuring an impressive MERV 10 rating, these filters are 20 times more efficient than typical 5 inch pleated filters. The filters are also excellent candidates for capturing a very high percentage of invisible household airborne particles. These filters last up to six months and no longer require an HVAC representative to service and replace your unit's filter. Establish an unrivaled breathing experience for you and your loved ones with Honeywell and their second to none series of 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 5-12 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 Hospital & general surgery
17 - 20 < 0.3 Micrometers Virus, carbon dust, sea salt, smoke Electronics & pharmaceutical manufacturing cleanroom
Product Specs
Furnace Filters for HVAC Systems

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TRN2121R1/E customer reviews

Overall Rating

4 Reviews
4 customers recommend this product
Honeywell TRN2121R1/E 5 Inch High Efficiency Air Cleaner Filter 21x21.5x5 Reviews
Ellen Kurinsky
September 29, 2016
Verified Purchase
Oh how clean the air

I was very pleased with both the product and service of Honeywell

Louise Whitehouse
September 22, 2015
Verified Purchase
Excellent service

Excellent service and delivery time was great. Appreciate all who work to put this item together and send out for customer. Great job guys & gals.

Michael Whitehouse
April 23, 2015
Verified Purchase
Worth waiting for.

Item was on backlog and Honeywell kept us updated as to shipping. Filter fit the bill...and was much worth the wait. Thank you for superior item.

Jose Hernandez
November 30, 2011
Worth the try

decided to try on my trane- glad I did. will use honeywell from now on, works great

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