21x23_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Grow Light Reflectors and a self-sealing fitting

and a self-sealing fitting

AXIOM works as a plant health promoter and growth stimulant by signaling defense systems in the plant with the introduction of the naturally occurring Harpin Protein (produced by an endopyhtic bacteria)

3-option preset temperature deadband (2/4/6°F)

4 - Zinnia

all in one bottle

21x23_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Grow Light Reflectors and a self-sealing fittingNordic 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