21x23_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack extraction Punches hole for FloraFlex® Micro

Punches hole for FloraFlex® Micro Tubing Accessories

This creates a barrier that insects don’t like

Elm Spanworm

Full Spectrum 6400K Grow Lights (T5HO)

Suggested operation on electronic ballast

21x23_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack extraction Punches hole for FloraFlex® MicroNordic 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