23_1/2x23_1/2x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack AC / Dehumidification / Humidification If no pre-harvest interval is

If no pre-harvest interval is listed

Schaefer Versa-Kool High Velocity Greenhouse Fan

Twist lock Flange

especially with PhysioSpec Greenhouse spectrum

23_1/2x23_1/2x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack AC / Dehumidification / Humidification If no pre-harvest interval isNordic 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