Direct-fired makeup air heaters shall not be used to supply any area containing ______.

Direct-fired makeup air heaters shall not be used to supply any area containing ______.

• A. sleeping quarters
• B. medical gas cylinders
• C. liquid petroleum gases
• D. flammable liquids

Answer: (A)

Direct-fired makeup air heaters burn fuel to heat and deliver combustion products directly into the treated space. In areas where people sleep, this introduces a real risk of carbon monoxide and other combustion byproducts accumulating in the room, which can be deadly for occupants who are asleep and less able to notice or react to warning signs. Because of that hazard, the use of direct-fired makeup air heaters is not permitted to supply sleeping quarters. The other situations pose their own risks, but the specific restriction here is about keeping sleeping areas free from direct combustion byproducts.

Direct-fired makeup air heaters burn fuel to heat and deliver combustion products directly into the treated space. In areas where people sleep, this introduces a real risk of carbon monoxide and other combustion byproducts accumulating in the room, which can be deadly for occupants who are asleep and less able to notice or react to warning signs. Because of that hazard, the use of direct-fired makeup air heaters is not permitted to supply sleeping quarters. The other situations pose their own risks, but the specific restriction here is about keeping sleeping areas free from direct combustion byproducts.