e/Air to cloth ratio

Information
has gloss	eng: The air-to-cloth ratio is the volumetric flow rate of air (m³/minute; SI m³/second) flowing through a dust collector's inlet duct divided by the total cloth area (m²) in the filters. The result is expressed in units of velocity.
lexicalization	eng: Air to cloth ratio
instance of	(noun) device that removes something from whatever passes through it filter