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prefilter

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prefilter [prē′fil·tər]
(engineering)
Filter used to remove gross solid contaminants before the liquid stream enters a separator-filter.
prefilter
In air-conditioning systems, a filter, 1 before the main filter to remove the larger particles; usually has a lower efficiency than the main filter and has a low pressure drop characteristic.
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The Model CLC Class 100 clean room oven also features a 130 cfm stainless steel powered forced exhauster, a 12" x 12" x 6" thick HEPA fresh air filter with a 2" prefilter, a 24" x 30" x 6" thick stainless steel high temperature HEPA recirculating filter, and a Partlow MRC 7000 programming and recording temperature controller.
Clean room cabinet oven by Rubber World
MA exits the mixing plenum horizontally through prefilters and final filters and then enters a second plenum.
In-place testing of in-duct ultraviolet germicidal irradiation by Rudnick, Stephen N.; First, Melvin W.; Vincent, Richard L.; Brickner, Philip W. / HVAC & R Research
The chosen approach incorporates from the start some measure of generalized bandwidth for the used prefilter so that eventually the link between that generalized bandwidth (the so-called "soft bandwidth") and a critical sampling interval shall be found.
A generalized sampling theorem for frequency localized signals by Hammerich, Edwin / Sampling Theory in Signal and Image Processing
 
 
 
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