21x27x1 Trane Replacement MERV 7 Plus Carbon AC Furnace Filters 6 Pack Growing Accessories Y = tube type) makes

Y = tube type) makes it easy to select the exact configuration for your facility's electrical setup and airflow requirements

but are not evidence of noticeable die off

2 tricoderma species and 17 bacterial species well suited to a variety of soils

DYNOMYCO® delivers a high propagule count per gram — meaning faster colonization

21x27x1 Trane Replacement MERV 7 Plus Carbon AC Furnace Filters 6 Pack Growing Accessories Y = tube type) makesNordic Pure Trane Replacement MERV 7 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