15x17x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack commercial-greenhouse-fixtures The controller features an on-board

The controller features an on-board processor that enables you to control fans in up to four zones with independent programming settings for each zone

Low battery indicator

beds and most other growing techniques

Advanced pH electrode diagnostics ensure worry-free measurements

15x17x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack commercial-greenhouse-fixtures The controller features an on-boardNordic 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