16x21x1 MERV 7 AC Furnace Filters 6 Pack LUXX 200W BAR 208-277V The holes and the shoulders

The holes and the shoulders at the bottom help the drainage of water and avoid the formation of rotten parts

The name says it all

Sodium Ignitor for BAS600A

Produces up to 1

odorous gases and other contaminants commonly found in indoor cultivation facilities

16x21x1 MERV 7 AC Furnace Filters 6 Pack LUXX 200W BAR 208-277V The holes and the shouldersNordic Pure MERV 7 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 7 furnace filters are comparable to HVAC filters with the rating of MPR 600. While different companies use different scales to measure the air filters