9x13x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack fluorescent-lighting tube can be shortened for

tube can be shortened for various applications

This formula ensures immediate availability of nutrients to plants

Since 1991 the #1 additive for hydroponics and soil gardeners world wide

natural convection thermal management (no fans or moving components)

Hydrofarm’s 4' x 8' rolling bench system is made of heavy-duty galvanized steel and will maximize the grow space in your greenhouse or grow room

9x13x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack fluorescent-lighting tube can be shortened forNordic Pure Custom MERV 10 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 condition