12_1/2x23_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack reflective-and-greenhouse-films 23" high boot covers are

23" high boot covers are designed with fabric and seams that have been rigorously tested for protection against blood and bloodborne pathogens

and soilless-based gardening mediums without the fear of irrigation line clogging and without the nasty smells associated with other brands

Start with Grow Big for growth

Reapply if it rains within 24 hours

DIN connector and 1m cable (included)

12_1/2x23_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack reflective-and-greenhouse-films 23" high boot covers areNordic 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