HVAC off during fogging

Production
1

Dear sir,
Why it is necessary to switched off the HVAC during fogging in area
@Sajjad_Ahmad

2

HVAC is switched off to prevent immediate outflow of fog.After specific time period its switched on.

3

It is not only off mood continuslly

As my knowledge, it is total 8 hours study

First 2 hours AHU off mood

Next 2 hours AHU internal circulation mood only (means main in of AHU off mood )

Next 4 hrs main supply of AHU and internal supply also

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