Attributes . Provides air quality class 1 particulate removal per ISO 8573-1, when used with the F74C series; Minimum service life of 400 hours can be expected if the vapor removal filter is protected upstream by an oil removal (coalescing) filter and if the filtration temperature is in the region of 70? to 80?F (21? to 26?C). Above this range, oil vapor content of compressed air increases substantially and element service life is reduced. . Names