21_1/2x23_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack LUXX 200W BAR 208-277V causing them to cluster together

causing them to cluster together and either fall out of the air or be captured by filters — effectively neutralizing them without chemicals or ozone

• Integrated pressure gauge with safe zones

Ideal for propagation and cloning applications

increase yields

21_1/2x23_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack LUXX 200W BAR 208-277V causing them to cluster togetherNordic 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