Envirco MAC 10 Original - Manual (Page 23)

MAC 10 ORIGINAL VE5 SERVICE MANUAL
PAGE 22
readings (128 velocity points). Envirco recognized using eight reading during a
cleanroom start-up may be time consuming and recommends using three Velgrid
readings taken on a diagonal, as shown below.
Figure 12- Velgrid Testing
Recommended Testing – 8 readings with a Velgrid
Factory Approved Testing – 3 readings with a Velgrid
Some of the testing procedures performed on the MAC 10 VE5 include PSL challenge
of HEPA/ULPA filters to assure specified performance, along with air velocity
measurement and adjustment tests. No DOP is used on Mac 10 Filters, unless
requested.
Recommended Testing
All units that are airflow tested at Envirco are tested using a Shortridge Airdata
Multimeter 800 series with a Velgrid head. The recommended method of
reading is to place one corner of the Velgrid head 1-1/4” from the corner of the
filter face and then take four reading evenly spaced along the four foot side, then
repeat these reads for the other long side. This gives a total of eight reading to
test the unit. All advertised data is based on using the Velgrid with eight