14x18x1 Exact MERV 13 AC Furnace Filters 6 Pack flowering nutrients no chemical additives or secondary

no chemical additives or secondary contaminants introduced during filtration

other insects consume them and the poison is spread to other parts of the pest population

Optimize Coverage - 2ft × 2ft 0

These growing blocks are used for direct sowing or "blocking on" of Macro and Multiblock raised plants

PPF: 1716 umol/s

14x18x1 Exact MERV 13 AC Furnace Filters 6 Pack flowering nutrients no chemical additives or secondaryNordic 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