Where must emergency remote controls for the mechanical means of ventilation of an NH3 machinery room be located?

Emergency remote controls for the mechanical means of ventilation of an NH3 (ammonia) machinery room must be located immediately outside the machinery room. This placement ensures that personnel can quickly access the controls in an emergency situation without needing to enter the potentially hazardous environment of the machinery room itself.

Having the controls just outside the room strikes a balance between accessibility and safety; personnel can shut down or ventilate the space effectively while remaining in a safer area. This is particularly important in facilities that handle hazardous materials like ammonia, where exposure to high concentrations can pose serious health risks.

Locating the controls inside the machinery room may delay response time in an emergency, increasing risks for those responding to a leak or other dangerous situation. Placing them at the entrance of the facility or in a separate control room may not provide a quick enough response time either, as it could involve navigating through additional areas before reaching the controls. Thus, the most logical and safety-conscious choice is to have them immediately outside the machinery room.