16_1/4x21_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack LUXX 200W BAR 208-277V the GroChek performs a self-check

the GroChek performs a self-check to assure proper working condition

The top temperature controller make it convenient to adjust from outside of the water

The YO-RATCHET gives the convenience of a self-winding yoyo with a positive lock of a rope ratchet

dial in your wanted humidity level

16_1/4x21_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack LUXX 200W BAR 208-277V the GroChek performs a self-checkNordic 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