Same Sprinkler Cover for Inside the Exhaust Duct?

8/8/2024

We are providing sprinkler protecting inside a spray/paint booth and its associated exhaust ducts.

The question we have is if the sprinkler(s) inside the exhaust duct require the same protective covering as the heads inside the booth below.

Thank you in advance for your input.

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9 Comments

Pete H

8/8/2024 07:12:46 am

I would put the protective covering on the heads inside the duct.

Duct protection is included in NFPA 33 (2018) 9.6.6

And the requirement for the covering is 9.6.7 and 9.6.7.1

Admittedly, I can't say that this puts the requirement directly within the purview of the the duct protection section; but if there is any fear of overspray residue existing within the ducts and the location is not sufficient enough protection, then the covering would be required by the wording of 9.6.7.

So best practice would be to just get a few extra bags, in my opinion. They won't hinder the performance of the sprinklers and I would imagine residue goes through the ducts.

Chad

8/8/2024 08:08:16 am

Yeah and the heads need to be accessible so access hatches, they get forgotten.

Up here in the north they do dry barrel in the stacks just in case cold air drops down there when the fans are not running

Glenn Berger

8/8/2024 08:11:48 am

The easy answer to your question is yes, provide the same level of protection to the sprinkler inside the exhaust as provided in the spray booth itself.

Anthony

8/8/2024 08:22:25 am

I agree with Chad and Glenn.
Also, I find their long term efficacy dubious unless you have a good maintainer changing out bag covers.

Dave L.

8/8/2024 10:46:48 am

I agree with Anthony's agreement. Regarding protection and access located adjacent.

While on the topic, note that NFPA 13 (16.2.4.2 in '19 ed.) says cellophane (0.003 in . 0.08 mm or less) or thin paper bags. Do not use poly / sandwich bags that will have shrinkage and melt. (See commentary in the Annex section.)

Jack G

8/8/2024 11:25:03 am

I agree with the cellophane bags per provisions in NFPA 13.
Years ago we used “ Grinnel picker trunk sprinklers” smooth coated for wiping clean.
I would use the picker trunk with the bags. Paint gets everywhere.

Dave L.

8/8/2024 12:06:25 pm

Wow, I had to look up picker trunk sprinkler!

Jeff H

8/8/2024 11:27:03 am

Where would you place the sprinkler head inside the duct?
I have some history and experience installing a dry chemical system in paint booths and the duct nozzle is placed above the fan which is usually realy close to the top of the booth aiming up.

Jesse

8/8/2024 02:23:41 pm

Yep indeed. Plan on providing the same means to protect the sprinkler(s) in the duct as you do in the booth.

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Same Sprinkler Cover for Inside the Exhaust Duct?

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