14_1/2x19x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack grow media with full kill down to

with full kill down to the root within 4–5 days for most weeds

Keep your growing environment in balance by ensuring you have proper ventilation

F5 Speed Controllers are perfect for all F5 products as well as most ventilation fans and equipment currently available on the market

Works with both Small and Large models

and provide an excellent particulate barrier

14_1/2x19x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack grow media with full kill down toNordic Pure Custom 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 condition