HEPA / ULPA  filtration

Based on the measured values for local and overall penetration, the filter is classified between class H10 and U17 in
accordance to the criteria shown in the table.

Cleanroom standards - class comparison

Filter
Classification
Efficiency (%) @ MPPS
Penetration (%) @ MPPS
EN1822
Overall Value
Local Value
Overall Penetration
Local Penetration
H10
85
--
15
--
H11
95
--
5
--
H12
99.5
--
0.5
--
H13
99.95
99.75
0.05
0.25
H14
99.995
99.975
0.005
0.025
U15
99.9995
99.9975
0.0005
0.0025
U16
99.99995
99.99975
0.00005
0.00025
U17
99.999995
99.9999
0.000005
0.0001
the company I our services I design I installation I clients I projects I validation I contact us

copyright©2005 D&E Technical Services Ltd
Tel: 01480 474430  Fax: 01480 386474  www.de-techservices.co.uk  email: info@de-techservices.co.uk