HVAC off during fogging

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

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

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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