|
Filtration Table of Contents
| Air
Filter Supplier
Prefilters are intended to remove large
particles upstream of HEPA filters. HEPA filters are intended
primarily for removal of sub-micrometer particles and should
not be used as coarse dust collectors. They have relatively
low dust-holding capacity, particularly for large particles
and lint, and may plug rapidly when exposed to high
concentrations of such material or smoke. Lint may tend to
bridge the pleats of the filter, further reducing its
capacity. The HEPA filter is also the most critical
particulate-removal element in the air cleaning system from
the standpoint of preserving confinement, and its failure
will result in failure of system function.
Prefilters, installed either locally at the
entrances to intake ducts, in the central exhaust filter
house, or both, extend the life of HEPA air filters and provide
at least a measure of protection against damage. Local duct
entrance filters also minimize dust accumulation in ducts and
reduce an otherwise potential fire hazard. The increase for a
specific application depends, of course, on the quality of
the prefilter selected and the nature and concentration of
dusts and particulate matter in the system.
© Copyright 2000 - 2009, by Engineers Edge, LLC All rights reserved.
Disclaimer
|
