13x21_3/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack ph-ec-tds-meters-and-solutions May be daisy-chained together

May be daisy-chained together

Prococo Chip-N-Fiber's high moisture retention

Anti-skid soles provide enhanced traction to help prevent accidental slips as you work

The absence of the frame eliminates shadows in the beam

0-hour REI (Re-entry Interval) & 0-day PHI (Pre-Harvest Interval)

13x21_3/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack ph-ec-tds-meters-and-solutions May be daisy-chained togetherNordic 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