Monmouth Scientific Cleanroom Kit 4M, Installation Manual

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Issue 03 – June 2018 50
Setting the fan speed
To accurately set the fan speed this requires the use of a calibrated Ø100mm rotating vane
anemometer with readings taken from 150mm from filter face.
Turn the system on and set the fan speed using the speed control knob (located next to main HEPA
filter outlet and DOP test port – under cover cap). Set to the required level using the anemometer to
measure the air velocity from the HEPA filter.
The air volume required to achieve N air changes per hour can be calculated by the following
formula:
Air volume required (m³/hour) = Room Volume (m³) X N
The air volume through the module can be calculated by the following formula:
CAM1000 : Air Volume (m³/hour) = 0.37 (filter area in m²) X measured HEPA velocity (m/sec.) x 3600
(secs/hr)
Based on the filter size used in this module (610mm x 610mm), the following table gives an
indication of air volume (m³/hour) against HEPA velocity:
HEPA Velocity (m/sec.) Air Volume (m³/hour)
0.30 400
0.35 470
0.40 535
0.45 600
0.50 670
0.55 736
0.60 800
0.65 870
0.70 935
0.75 1000
0.80 1075
0.85 1130