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Model # TRN2121R1

Internet # 100685247

21-1/2 in. x 21 in. x 5 in. Pleated Replacement Air Filter for Trane or American Standard

This item has been discontinued.
The Home Depot no longer carries this specific product.
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$35.72 / each


Model # TRN2121R1

Internet # 100685247

This Honeywell 21-1/2 in. x 21 in. x 5 in. Pleated Air Filter features a MERV rating of 10 for enhanced efficiency in removing airborne particles including common allergens, dust, pollen, mold spores, dirt and fibers from your home's airflow. This filter has up to a 6-month life and is designed to replace Trane or American Standard Perfect Fit filter model BAYFTAH21M.

  • Pleated filter design for enhanced filtration capacity
  • Lasts up to 6 months
  • Captures household air particles such as, common allergens, dust, pollen, mold spores, dirt and fibers
  • MERV rating of 10
  • Replacement filter for Trane or American Standard perfect fit model BAYFTAH21M


Actual Product Depth (in.) 
Actual Product Height (in.) 
Actual Product Width (in.) 
Air Filter Depth (in.) 
Air Filter Height (in.) 
Air Filter Size 
21.5 in. x 21 in. 
Air Filter Width (in.) 
Product Thickness (in.) 
Air Filter Features 
Filters Bacteria,Filters Dust/Lint,Filters Mold Spores,Filters Most Smoke,Filters Odors,Filters Pollen,Filters Viruses,Fully Incinerable,Pleated 
Air Filter Type 
Filter Frame Material 
Filter Material 
Filter Performance Rating (FPR) 
Not Rated 
Longevity (months) 
MERV Rating (Minimum Efficiency Reporting Value) 
Warranty / Certifications
Manufacturer Warranty 


Rated 4.7 out of 5 by 63 reviewers.
Rated 5.0 out of 5.0 by Best price, quality product I change this air filter twice a year. Home Depot's price for the Honeywell product is the best I've seen. Each filter is individually wrapped. My order was delivered by UPS within a week of ordering on line. October 16, 2012
Rated 5.0 out of 5.0 by 21x1/2 in.x21 in.x5 in. PLEATED AIR FILTER I wish that you would carry them in the store not just on line October 14, 2014
Rated 4.0 out of 5.0 by Hard to find These central air conditioner filters are very hard to find. They aren't even in the store(Home Depot), so I had to order them on line through Home Depot. Shipping took about a week. They work well. August 26, 2014
Rated 4.0 out of 5.0 by It works well We change our furnace filter twice a year. The filter seems to work very well in keeping down the dust, pollen and airborne particles. November 4, 2014
Rated 4.0 out of 5.0 by The product fit great. The product fit great. No Problems. I am satisfied. December 10, 2013
Rated 5.0 out of 5.0 by Honeywell Air Filter Saves Money I saved time and money by buying and installing this Honeywell Air Filter myself. Home Depot shipped my filters immediately. I saved money by buying a replacement filter rather than buying the Trane filter. I again saved big money by installing the filter myself rather than calling for the HVAC service people to install and paying for a service call. Replacing the filter is so simple and it only took 5 minutes. The Honeywell filter fit perfectly and has the same specs as the Trane filter. This is the only way to go in these tight money times. February 6, 2010
Rated 4.0 out of 5.0 by Replacement a/c filter Identical brand and stated dimensions to the filter that was in my a/c unit, but differently configured so that it was actually difficult to insert properly. Price and delivery were excellent May 14, 2013
Rated 5.0 out of 5.0 by Great Product This filter fits my Trane AC perfectly and does a great job. The price at Home Depot can't be beat. June 4, 2013
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