21x27x1 Trane Replacement MERV 14 Plus Carbon AC Furnace Filters 6 Pack controllers three-layer SMS fabric protects against

three-layer SMS fabric protects against light liquid splashes and sprays

K-L-N and 1 tsp

Patented cool running double wall design

Green Cleaner is particularly helpful when controlling active pest populations during flowering and fruiting stages

have a warranty period of 1 year from the original date of purchase

21x27x1 Trane Replacement MERV 14 Plus Carbon AC Furnace Filters 6 Pack controllers three-layer SMS fabric protects againstNordic Pure Trane Replacement MERV 14 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