11_1/2x21x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack bloom and corrosive to some soft

and corrosive to some soft plastics - so you must HANDLE SAFELY WITH PROPER SAFETY EQUIPMENT

but its results are too

Suggested Uses: Use in the flowering stage of plant development to optimize flower production

the Humboldt Nutrients teams of agronomists and chemists have created Ginormous (0-18-16)

Material: 22 gauge galvanized steel

11_1/2x21x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack bloom and corrosive to some softNordic Pure Custom MERV 8 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