AIR FURNACE FILTER : INDUSTRIAL FILTERS AND FABRICS : DIY ACTIVATED CARBON FILTER.
Air Furnace Filter
A filter is a pleated or other type of device used to remove dust and other particles from air to protect the HVAC equipment. Filters vary how well they work and it is measured as MERV rating.
The invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen
a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of; "air pollution"; "a smell of chemicals in the air"; "open a window and let in some air"; "I need some fresh air"
air out: expose to fresh air; "aerate your old sneakers"
The free or unconfined space above the surface of the earth
This substance regarded as necessary for breathing
be broadcast; "This show will air Saturdays at 2 P.M."