16_1/4x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_hf The iL1 and iL1c uses

The iL1 and iL1c uses a unique offset

Can be applied up to and including the day of harvest (0-day PHI) and has a 0-hour REI (Restricted Entry Interval)

4Ah 36V lithium-ion battery

Higher luminosity levels per square inch

16_1/4x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_hf The iL1 and iL1c usesNordic Pure Custom MERV 10 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