Location
The location of your control room must be chosen carefully to avoid the introduction of flammable gases or vapors.
Attention must be paid to the direction of winds that could potentially enter the control room.
If there are potential flammable gases and/or vapors near the control room then adequate ventilation must be installed—that is, installed high enough for the intake fan to be out of the way of potential dangers.
If no adequate source of non-contaminated air is available then ductwork will be required for the air intake.