I hope you the booth is not actually in the wood shop. Flammable vapors are incompatible with combustible dusts.

I've never seen a fan with that much delay. But I have seen systems with the fan at the end of a long duct that takes a long time to develop a enough negative pressure to create a breeze. Have you seen the mechanical plans?

Most spray booths run only on demand since they exhaust a lot of cfm. Multiply the area of the face by a minimum velocity of 100 ft per minute. No system can afford to hurl that amount of air out the stack.

Monona

Sent from my iPhone

> On Nov 9, 2016, at 3:56 PM, Stuart, Ralph wrote:
>
> I have a exhaust fan design question that someone in this group may be able to comment on. We have a spray paint booth in our wood shop (2014-vintage) with a lab style fan (Vektor-H Laboratory Exhaust System - Greenheck Fan) on it. It is turned on and off as needed with a off/low/high switch, but when we turn it on, there is no apparent response for about 5 minutes. This makes it difficult to convince the booth users that the system is working, since they may complete their work in the booth (e.g. spray painting a piece) before the system is fully operational.
>
> I realize that most lab fan systems are on 24/7, but I wonder if anyone has run into similar situations with systems which are designed to be turned on and off routinely?
>
> Thanks for any thoughts about this.
>
> - Ralph
>
> Ralph Stuart, CIH, CCHO
> Chemical Hygiene Officer
> Keene State College
>
> ralph.stuart**At_Symbol_Here**keene.edu
>
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> This e-mail is from DCHAS-L, the e-mail list of the ACS Division of Chemical Health and Safety.
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