25x30x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Liquid & Weight Measuring 2 large roof vents provide

2 large roof vents provide optimal greenhouse ventilation

Reduce the application interval to 3-5 days if insects get out of hand

and 3′ x 6′ trays for the 4′ x 8′ tent

The enclosure outline makes panel-mount cutouts simple

25x30x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Liquid & Weight Measuring 2 large roof vents provideNordic 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