21x27x1 Trane Replacement MERV 13 Plus Carbon AC Furnace Filters 6 Pack lighting-systems/kits the duct fan can maintain

the duct fan can maintain airflow even in high static pressure applications

No additional labor required

Upgrade your grow operation with GroEzy — the efficient

Box Dimensions: 5 x 10 x 31

Results are seen within hours

21x27x1 Trane Replacement MERV 13 Plus Carbon AC Furnace Filters 6 Pack lighting-systems/kits the duct fan can maintainNordic Pure Trane Replacement MERV 13 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