15x18x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Water Filtration top-grade BPA-free white plastic HIGH

top-grade BPA-free white plastic HIGH REFLECTIVITY – The white plastic reflects light back to plants LARGE SIZE – With an outer dimension of 21

Natural plant oils for the control of Spider Mite infestations

aluminum foil and polyester tri-laminate

where most aeroponic system will fail

Stimulates resin and crystal production in all varieties

15x18x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Water Filtration top-grade BPA-free white plastic HIGHNordic Pure Custom MERV 13 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