21x23_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Electrical Components Ideal for foliar application

Ideal for foliar application

These paper-wrapped Mini Blocks are designed for seedlings and cuttings

the meter will shut down to avoid erroneous readings caused by low battery level

The 16-17mm Double Layered Tubing connects to all of our 16-17mm Pipe Fittings and serves as a manifold for all of the FloraFlex® Micro Dripper Assembly units

Controller compatible (SOLD SEPARATELY)

21x23_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Electrical Components Ideal for foliar applicationNordic 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