Protection for Type II Exhaust Hoods?

8/13/2019

Once again great info/insight. Though it made me think.

What if you have a type II hood without wet chem protection? Are sprinklers required? I think yes (following obstruction rules).

To take it a step further, what if you have a type I hood with protection over the required appliances including the plenum but not below the plenum in areas where there are ovens/non-cooking equipment? As an AHJ, I have never required additional protection here. But now I question myself.

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1 Comment

pjd

8/13/2019 06:28:24 pm

I recently went through this. IFC says that it has to be protected by an automatic system, but it doesn't specify one over the other or prohibit. It can be wet chem, dry chem, water based, or clean agent.
Type 2 hoods are by definition handling smoke exhaust with grease laden vapors from cooking equipment. The fuel source defines that they be protected with K class wet chem agent. In the absence of an automatic wet chem system, I have been approved for equivalency under NFPA 13, by providing K-class manual extinguishers and a manual pull station along the egress path to cover the obstruction from ceiling-level protection.

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