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APPENDIX
APPENDIX B
MEASUREMENT OF FACE VELOCITY TEST
SECTION A: PROCEDURE
1. Do not attempt measurements on a windy day. It is best if doors are not being opened and shut
elsewhere in the building.
2. Arrange the ventilation of the room so that it is most unfavorable to extraction by the fume
cupboard concerned
3. Remove everything from the fume cupboard so that the air flow is not obstructed by objects.
4. Do some quick air flow measurements to see if, with the sash at maximum height, the minimum
face velocity is likely to be over 0.3 ms
-1
. Set the sash to its normal operating height.
5. Record this sash height.
6. Imagine the face of the fume cupboard divided into nine equal rectangles. Stand as far as
practicable from the fume cupboard with the sensing heading in the plane of the sash and take
air flow reading at approximately the centre of the nine rectangles.
a
b
c
d
e
f
g
h
i
7. Record for each rectangle the approximately average reading over a period of at least ten
seconds.
8. Look at the table and repeat any reading which seems to be very different from the general
pattern. Record the average of this and the previous readings.
Note:
Do note that our factory face velocity test provided in our test report is based upon the ASHRAE
standard which uses more extensive equipments. The following face velocity test however is based upon the
COSHH (HSE) which is provided here for your general on-site testing. Please consult your distibutor if you
which to conduct the face velocity test based upon the ASHRAE standards.
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Summary of Contents for ASCENT OPTI BASIC
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