16_1/2x21x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Trimming Shears L-Glycine and L-Glutamic Acid -

L-Glycine and L-Glutamic Acid - with no fillers or dyes

Keep your grow area clean to prevent the spread of pathogens throughout your crop

Operate at commercial scale and need consistency

Defender PM can also interrupt the reproductive processes of various pests

16_1/2x21x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Trimming Shears L-Glycine and L-Glutamic Acid -Nordic 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