Detector Coverage for Clean Agent System 1

[sv879]

Dear Experts,

Most of the manufactures literature shows that photoelectric detectors installed for maximum area coverage of 250 ft² (23.2 m²) per detector.

Any idea where does the 250 ft² (23.2 m²) come from?

 

[stookeyfpe]

A typical analog or digital listed smoke detector intended to be connected to a FACP is designed for 30 Ft x 30 Ft spacing. The area of protection may be reduced based on air flow velocity. This is answer is based on NFPA 72 (2016 ed.)

 

[cdafd]

sv879

Is the spacing due to requiring two detectors to activate, before the system dumps?


And if normal spacing, may delay activation?

 

[sv879]

I don't think so. I am talking about reduced spacing without cross zone/counting zone.

How come?