28x32x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack post harvest Cone shaped internal base for

Cone shaped internal base for optimum air flow

Aphelinus abdominalis aphid parasites not only lay eggs in aphid nymphs

Driest value-priced rockwool on the market

Handles available on sizes #3-#30

Perfecta VEG is also compatible with all hydroponic growing systems and media

28x32x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack post harvest Cone shaped internal base forNordic Pure Custom MERV 12 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