Which fire alarm cable type is most suitable for an environmental air return space with no ducts?

Which fire alarm cable type is most suitable for an environmental air return space with no ducts?

• A. FPL
• B. FPLR
• C. FPLP
• D. PLFP

Answer: (C)

In fire alarm cabling, match the cable to the space’s air-handling characteristics. An environmental air return area is part of the building’s air distribution path, so any cable installed there must be plenum-rated. Plenum-rated cables are designed to minimize smoke and toxic gas production and withstand the air-flow environment found in plenums and return ducts, making them suitable for environmental air spaces even when there are no ducts. The plenum-rated option is the best fit because it specifically meets those requirements for use in air-handling spaces. Other cable types are intended for different applications—general-use fire alarm cables are not approved for air- handling spaces, and riser-rated cables are meant for vertical runs between floors. Using those in an air return space could fail to meet code and safety standards, especially in terms of smoke and toxicity when a fire occurs.

In fire alarm cabling, match the cable to the space’s air-handling characteristics. An environmental air return area is part of the building’s air distribution path, so any cable installed there must be plenum-rated. Plenum-rated cables are designed to minimize smoke and toxic gas production and withstand the air-flow environment found in plenums and return ducts, making them suitable for environmental air spaces even when there are no ducts.

The plenum-rated option is the best fit because it specifically meets those requirements for use in air-handling spaces. Other cable types are intended for different applications—general-use fire alarm cables are not approved for air- handling spaces, and riser-rated cables are meant for vertical runs between floors. Using those in an air return space could fail to meet code and safety standards, especially in terms of smoke and toxicity when a fire occurs.