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Dust Collector Vent Ducting

Dust Collector Vent Ducting

(OP)
I am wondering if anyone has been involved with ducting the explosion vent from a dust collector located inside a building? In particular are elbows allowed to be used from the dust collector vent to the outside? The dust collector we are dealing with is not far from the outside wall, but to vent it to a proper location would invlove at least one, maybe two elbows.
Thanks.

RE: Dust Collector Vent Ducting

You may want to reference the NFPA.

RE: Dust Collector Vent Ducting

Just signed up and saw this post. If you are still interested in some help, I have been involved in preparing a calc program for explosion venting based on NFPA68 and 69 and NFPA654 and 664, which were prompted by OSHA directive CPL03-00-008 applicable to wood working plants.
NFPA68 Annex section has a example which includes elbows in ducting from explosion vent. The flow resistance coefficient K needs to be determined, however for the effect of any elbows. If possible have a lab determine Kst and MEC of your specific dust in dust collector, so adequate explosion vent area can be met.

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