Honeywell TRN1727R1/E 5-Inch High Efficiency Air Cleaner Filter, 27-Inch by 17.5-Inch by 5-Inch
High Efficiency Air Cleaner Filter for Trane or American Standard Perfect Fit; Merv 10 Rating that is up to 20 times more efficient than typical 5-Inch pleated filter; Lasts up to 6 months; Captures High Percentage of household airborne particles, including microscopic particles that you can't see; Consumer no longer has to wait for the HVAC rep to replace the filter.