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😱 ok iam on it
ANSWER TO NO 7
Why I will not take pressure measurement within hood or at the entrance of duct
In a simple system, it is hazardous, the fan produces a negative pressure in the duct immediately
upstream, and this draws air through the system. There is a pressure drop across the air cleaner,
and along each section of the duct. Finally there is a pressure drop at the entrance to
the hood which draws air in from the workplace.
ANSWER TO QUESTION 8
Yes the SP being the static pressure should be positive to avoid ambiguity.. Make-up air Exhaust
ventilation systems require replacement of exhausted . There suppose to be also automatic
chemical n...
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