21x23_1/2x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack ventilation Effective against a wide range

Effective against a wide range of biting and sucking insects

1 x Temp / Humid / Light 3-in-1 Sensor

instructions and service reminders

Plant Growth Promoter - With the increased accessibility of nitrogen in the soil

21x23_1/2x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack ventilation Effective against a wide rangeNordic Pure Custom MERV 7 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