13x18x1 Exact MERV 13 AC Furnace Filters 12 Pack ac-/-dehumidification-/-humidification is highly insensitive to pollution

is highly insensitive to pollution and offers outstanding long term stability

With a 5oz reservoir for any liquid libation and a front opening container

Manufactured with quality components

When used as a foliar spray in the first weeks of flowering

Life has shown to reduce the number of days to root from cuttings and increase cuttings overall survival rates

13x18x1 Exact MERV 13 AC Furnace Filters 12 Pack ac-/-dehumidification-/-humidification is highly insensitive to pollutionNordic Pure MERV 13 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200