16_3/8x21_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack spl_spectrumking For maximum uniformity

For maximum uniformity

Organic & Conventional Compatible – Approved for use in both certified organic and conventional growing programs

and made of 100% food-grade nylon

Mint Oil – Secondary active ingredient

unbranded bags

16_3/8x21_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack spl_spectrumking For maximum uniformityNordic 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