16x28x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Water Heaters Chillers *A control unit and reservoir

*A control unit and reservoir (sold separately) are required to use this expansion pack

pickleworm

to save space in the grow room

Both does both functions—on delay and overtemperature protection

Lithium ion (Li-ion) batteries are an awesome technology constantly improving and that is why they are very expensive

16x28x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Water Heaters Chillers *A control unit and reservoirNordic Pure Custom MERV 8 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