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Specs for nitro spray booth?
http://luthiersforum.com/forum/viewtopic.php?f=10101&t=43398		 Page 1 of 1
Author:  Colin North [ Thu May 08, 2014 7:36 am ]
Post subject:  Specs for nitro spray booth?
I found a reasonably priced supplier for an extractor fan, centrifugal fan, motor is out of air-stream, and it moves about 1300m3/hr at max pressure of 800Pa.
Can anyone tell me if this could make a suitable fan for a nitro spay booth?
Author:  kencierp [ Thu May 08, 2014 7:55 am ]
Post subject:  Re: Specs for nitro spray booth?
Fans suitable for nitro/solvent paint spray booths are specified as totally enclosed and most importantly "explosion proof" ours is a model from "Dayton" it came with the spark proof aluminum blade. These specs are also on light fixtures for use in spray booths.
Author:  Colin North [ Thu May 08, 2014 8:25 am ]
Post subject:  Re: Specs for nitro spray booth?
Thanks for the reminder.
I already have an email out requesting confirmation of that, but it is more the capacity/pressure I was querying.
Author:  kencierp [ Thu May 08, 2014 9:04 am ]
Post subject:  Re: Specs for nitro spray booth?
Sorry, misread the question -- answers will be interesting. I imagine there are design parameters booth volume, CFM etc. My main concern was to have a fan powerful enough for the booth size to create a noticeable significant down draft. I figured with that, adequate air turn over would be an automatic side benefit. Certainly a SWAG.
Author:  Haans [ Thu May 08, 2014 9:10 am ]
Post subject:  Re: Specs for nitro spray booth?
I bought this quite a few years ago. I would call it bare minimum, and it takes about another 2-3K for wiring, and explosion proof lights, switch and plumbing. You also need an equivalent amount of replacement air. If you live anywhere north of 45 degrees in winter, you either don't spray like me, or get a heat exchanger that runs another 5K or so...

http://www.ebay.com/itm/G0532-2-HP-Dry- ... 3f339d0f07

Sure, I'm sure there are other solutions like spraying lacquer through a window fan :shock: , but even though I did it for years with spirit varnish, I wouldn't recommend it...boom! You must also consider the drying room, which is my spray booth room also. Offgassing of lacquer is just as dangerous as spraying it.
Author:  kencierp [ Thu May 08, 2014 9:25 am ]
Post subject:  Re: Specs for nitro spray booth?
Here's a clever idea posted over at our KMG forum
http://acousticguitarconstructionforum. ... f=33&t=146

Seems safe in concept -- but not sure were the fume end up?
Author:  Terence Kennedy [ Thu May 08, 2014 10:11 am ]
Post subject:  Re: Specs for nitro spray booth?
One thing to keep in mind is that a good fan will quickly suck all the air out of your shop and in the winter cause the humidity and temps to plummet-the opposite in summer.

With nitro the guitars need a well ventilated humidity and temp controlled space to off gas. If you use your shop for that it will smell like nitro for much of the time.

I'd be interested to know how those that spray nitro in their shops address these issues without having a completely separate finishing and curing area with a separate air supply.

Whoops I didn't see Haans' post. I've seen his booth and solution to air exchange. It's pretty ingenious and essential in MN
Author:  Colin North [ Thu May 08, 2014 10:25 am ]
Post subject:  Re: Specs for nitro spray booth?
Haans, nice set up, but 2-3K for wiring? Ouch!
Ken(?) post says it vents outside.
I have sketched up a similar set-up for a filter box, but a dedicated separate spray shop with insulation and heat, so really a "finishing shed"
I also have a buffer I'd like to get in it (and wood).
I have the space (just), but am concerned about the dust being incompatible with spraying, even if cleaned up after using it.
Author:  kencierp [ Thu May 08, 2014 10:58 am ]
Post subject:  Re: Specs for nitro spray booth?
Yep -- I am a very good reader except when there's words involved.
Author:  Colin North [ Thu May 08, 2014 11:26 am ]
Post subject:  Re: Specs for nitro spray booth?
laughing6-hehe
I'm pretty good at reading pictures...
Author:  Dave Livermore [ Thu May 08, 2014 2:10 pm ]
Post subject:  Re: Specs for nitro spray booth?
Alternative idea;

I dreaded the thought of dropping the exorbitant amount of money needed for explosion proofing my booth.
Then one night I realized that pulling the air was the same as PUSHING the air out.

The booth is sealed up tight and air is positively, rather than negatively pressurized in the room.
No fumes or gases pass by ANYTHING electrical. There is a vent to the outside, and a filter over it to catch the solids.
A furnace blower and motor cost nothing from an old furnace.

In my case I even built a down draft table under my work bench, built a box around the fan and exhausted it into the spray booth.
I open a door to bypass the downdraft table, close the door in the booth and spray away.

Hope this info helps
Author:  Colin North [ Thu May 08, 2014 3:45 pm ]
Post subject:  Re: Specs for nitro spray booth?
After a few hours searching the net, I think I found an answer.
1300 M3/m = 765 CFM, so for 100 feet/m linear flow (Binks recommended) the fan will support an area of 7.65 sq feet.
So a 3' x 2.5' booth would be supported by this fan.
Oh, and the supplier says
Quote:
We can offer an Anti Spark version of the above fan for £230 Inc Vat. 4 week lead time.

The lighting and wiring is another story......
Author:  Haans [ Thu May 08, 2014 6:05 pm ]
Post subject:  Re: Specs for nitro spray booth?
Colin, perhaps it was more like $1500, and included putting in a new box in the house. You would be surprised at what an explosion proof light costs, and the electrical tubing has to be isolated so they flood the inside with some kind of red gunk. I have a 10" intake and a small 6" outlet also, and as Dave said, another fan is mounted outside the room in the intake to push in some fresh air and pushes open the 6" outlet vent to move the off gassing air in the room after several hours of the booth running.
Typically, I will spray two coats on a couple of guitars a day, let them off gas for several hours, then shut off the booth and start the other fan outside the room to push air out. By that time, the worst of the fumes are gone, and that fan runs overnight. There just isn't enough CFM in a furnace fan to pull through several filters and pump 8-1200 CFM. At 1200 CFM, you can just pull the overspray through the filters and not cloud the room. The force of the fan is so powerful, that I can barely get the door open to the room. If left open for too long, it will pull so much air from the house, instead of the makeup intake that the pilot light goes out on the water heater on the other side of the basement.
With this system, and a good double filter 3M mask pulled to strangle, there is no smell...
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