16_1/4x21_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack spl_hrg The double-sided lock can be

The double-sided lock can be activated with either your right or left hand

TSH-1 can control EC fans etc

Single Box: 13

To ensure best results

Easy assembly with custom press-in fasteners

16_1/4x21_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack spl_hrg The double-sided lock can beNordic Pure Custom MERV 14 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