Thanks I missed that the 100 wasn't cubic. My booth is actually 56"x56" and 36" deep. I took a gamble and ordered a cheap eBay fan. It's new and coming from China. It is advertised as explosion proof and 3530 M3/hr. This back calculates to 95 ft/min velocity. A bit short of the 100 but I think it will be ok. I hope it is explosion proof but I don't know if I will be able to tell. $165 plus shipping.
The Plane Anarchist
Would a fan blade mounted on a 3phase induction motor qualify as explosion proof? Or even better, a would TEFC (Totally Enclosed Fan Cooled) 3ph induction motor be explosion proof? Assuming that the motor contactor is no where near the volatile fumes. ...Just thinking out loud more than anything.
Here’s a pic of the fan I have on order. I’m hoping it is actually explosion proof as advertised.
The Plane Anarchist
I also made the front curtain short enough so I can reach under it while standing outside the booth. Kinda like a bio glove box. I don’t know how much I’ll actually close the front curtain, but it’s an option.
The Plane Anarchist
Doesn't have to be expensive to be explosion proof. Just Google explosion proof fans, lots of choices under $200. Reminds me that BigAss fans sells a 6 foot diameter shop floor air mover (not explosion proof) for $7k. There is a price point for most any market. https://www.amgair.com/big-ass-fans-...table-fan.html
NOW you tell me...
BigAss Fans are awesome. We have 3 of them in our store that run at low speed 24/7. They've been running continuously for 7 years now and none have had an issues whatsoever. They are expensive, but I think they are worth every penny.
I'm seeing a great deal of ignorance on what "explosion proof" really means. The reality is it can mean a number of things depending on the risk level. It means different things depending on whether you're dealing with liquids, gasses, or dust. The NFPA is a great source of information on the subject. If you want to go whole hog, design to Class 1, Division 1. Everything sealed, no possibility of sparks, no possibility of static discharge, etc.. Note that this is crazy expensive and nothing you need unless you're processing fuel or running a munitions depot.
To the OP: Please do some research. The fan you depict isn't explosion proof. If it was the impeller would be bronze and the motor would be both TEFC and out of the airstream. That said, I think you'll find that your proposed solution will be just fine given your stated scenario. Make sure you move plenty of air so the concentration of any fumes doesn't reach an explosive level.
Sharp solves all manner of problems.
Good catch on the fan Rob. I thought it seemed too cheap. Now that I think about it, just the termination cost to an explosion proof motor could easily more than double the price of that fan. That would include labor because that is not a DIY thing.
The inside of the spray booth is Class I, Div I. Explosive concentrations of vapors will routinely happen there. Hence my strong suggestion (if I could insist then I would) that the LED lights be moved outside the booth.
Last edited by Alan Lightstone; 04-26-2022 at 9:36 AM.
- After I ask a stranger if I can pet their dog and they say yes, I like to respond, "I'll keep that in mind" and walk off
- It's above my pay grade. Mongo only pawn in game of life.
I found this link which seems to go into detail regarding the NFPA 33 Spray Booth Regulations. Interesting, but TL;DR parts of it.
https://www.spraysystems.com/nfpa-33/
- After I ask a stranger if I can pet their dog and they say yes, I like to respond, "I'll keep that in mind" and walk off
- It's above my pay grade. Mongo only pawn in game of life.
I’ve pretty much concluded that I’ll stick to water base finished with an occasional rattle can of something. The fan is supposed to flow 2077 cfm which will give me 33 air exchanges per minute. I’m pretty sure this will be more than adequate for any rattle can work I’ll do.
The Plane Anarchist