15x23x1 Exact MERV 8 AC Furnace Filters 6 Pack Controller blue and white) knobs for

blue and white) knobs for precise spectral control

This solid design includes valve

Product not included with this item

The pH sensor in the probe is a single junction electrode with gelled electrolyte and a retractable cloth junction

No arch lip allows you to maximize your inner and outer grow/work space

15x23x1 Exact MERV 8 AC Furnace Filters 6 Pack Controller blue and white) knobs forNordic Pure MERV 8 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores and other contaminants are removed. MERV 8 furnace filters are comparable to HVAC filters with the rating of MPR 800. While different companies use different scales to measure the air filters