21x27x1 Trane Replacement MERV 12 Plus Carbon AC Furnace Filters 6 Pack Paleo Bloom BT NOW is most effective

BT NOW is most effective when applied during the active feeding stage of larval life

Constructed of aluminum and thermoplastic

For use in generally cooler climates

and you're set

Dimensions: 2’x4’x4’11”

21x27x1 Trane Replacement MERV 12 Plus Carbon AC Furnace Filters 6 Pack Paleo Bloom BT NOW is most effectiveNordic Pure Trane Replacement MERV 12 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air