DETECTOR PLACEMENT

Detectors are required over cooking appliances and in the duct(s) of protected ventilation hoods. Detectors shall be located in the plenum area of the ventilation hood.

1. Exhaust Duct(s).

Each exhaust duct must have at least one (1) detector installed in the duct entrance, located in the air stream of the cooking vapors at a maximum of 12 feet (3.7 m) into the duct, centered. See Figure 3-25.

2. Cooking Appliance(s).

Each cooking appliance with a continuous cooking surface not exceeding 48 in. x 48 in. (122 x 122 cm) shall be protected by one (1) detector. Cooking appliances with a continuous cooking surface exceeding 48 in. x 48 in. (122 x 122 cm) cooking area. Detectors used for cooking appliances must be located with in the perimeter of the protected appliance towards the exhaust duct side of the appliance. The detector should be located in the air stream of the appliance to enhance system response time. 

If a cooking appliance is located under a duct opening where a detector has been mounted, it is not necessary to utilize an additional detector provided the duct detector is not more that 12 in. (31 cm) into the duct opening. If two (2) appliances are located under a duct opening where a detector has been mounted, it is not necessary to utilize an additional detector provided the duct detector is not more that 12 in. (31 cm) into the duct opening. See Figure 3-23.  

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