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Efficiency Results
300 Series
Part Number
Efficiency (A) MAX
Flow GPM (B)
93% 96%
KHE 323P2SSL 1 um 2 um 75
KHE 325P2SSL 3 um 5 um 75
KHE 327P2SSL 8 um 18 um 75
KHE 329P2SSL 18 um 25 um 75
500 Series Efficiency (A) MAX (B)
Part Number 96% 99% Flow GPM
KHE 523P2SSL 1 um 2 um 50
KHE 525P2SSL 3 um 5 um 50
KHE 527P2SSL 8 um 18 um 50
KHE 529P2SSL 18 um 25 um 50

(A) Efficiency represents the initial efficiency on a clean element challenged on a single pass through a water base slurry of PT1 fines test dust at 3 GPM. Effieciencies are derived by counting the ratio of upstream versus downstream particles um = micron.
(B) Flow data based on gallons per minute (GPM) for 1 pound (PSID) of pressure across a clean filter.

Flow Results
300 Series 500 Series
Max Dirt Grams of Dust (C) 1,200 2,042
Max Total Filter Layers 5 10
Max Sq. Ft. Surface Area 23 43
Quantity Per Large Box 20 10
Max Temperature 200 F 200 F
Felt and Microfiber Sections Yes Yes
Easy Lift Handles Yes Yes
Silicone Free Yes Yes
No Exposed Sewn Seams Yes Yes
Oil Absorption and Removal Yes Yes
Batch Operations Yes Yes
Continuous Operations Yes Yes
Pure Polypropylene Media Yes Yes

(C) Dirt load conducted until vessel pressure reached 40 pound (PSID).

Knight Corporation believes laboratory generated performance data is a useful tool for comparing different micron ratings and as a guide for establishing a recommendation in a filtering application. However, this data should not be construed as a guarantee or warranty by Knight Corporation, either expressed or implied, of a specific performance from use of our product. Due to variances in fluid viscosity, temperature, velocity, pressure and contaminant size, shape and texture, Knight Corporation cannot guarantee field results equaling test results.

Filter Products Company
The Most Complete Range of Filters and Synthetic Lubricants Available World Wide!
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