21x27x1 Trane Replacement MERV 14 Plus Carbon AC Furnace Filters 6 Pack Plant Support Magnum with Vitamin B1 is

Magnum with Vitamin B1 is a potent magnesium supplement for preventing or treating the magnesium deficiency that often appears during bloom

6" bottom and 7" height

or potency

making cleanup easier and less frequent

21x27x1 Trane Replacement MERV 14 Plus Carbon AC Furnace Filters 6 Pack Plant Support Magnum with Vitamin B1 isNordic 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