17_1/2x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack meters-&-solutions Improved design

Improved design

Compatible with e-Ballasts which operate at or above 100 kHz

Technaflora's exceptional liquid extract is made from 100% pure

Dripper assembly uses a 0

(3) 8kg batches of Lettuce or Tasmin Bay (Basil) 2-part nutrients (enough for 3+ months)

17_1/2x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack meters-&-solutions Improved designNordic Pure Custom MERV 12 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