Honeywell Air Filter High-Efficiency TRN2321R1/E, 21x23.5x5 - Merv 10

The Honeywell TRN2321R1/E High Efficiency Air Cleaner Filter for Trane or American Standard Perfect Fit. This filter features a Merv 10 Rating that is up to 20 times more efficient than typical 5 inch pleated filter. It lasts up to 6 months and captures a high percentage of household airborne particles, including microscopic particles that you can't see. With the purchase of this filter the consumer no longer has to wait for the HVAC rep to replace the 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.

MERV RATING	MIN. PARTICLE SIZE	TYPICAL CONTROLLED CONTAMINANT	TYPICAL APPLICATIONS
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