21x21x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack double-ended It has dual outlets

It has dual outlets

the AutoPot FlexiTank can be stored away when not used

Provides 3½ times the coverage as regular Sluggo

and poor air quality threaten the productivity and compliance of your commercial or industrial facility

It is a replacement electrode for the GroChek series "-5" models: HI9813-5 & HI9813-5N

21x21x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack double-ended It has dual outletsNordic 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