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Paint Booth need fan

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  • #16
    I thought about an old furnace air blower fan. Did not fit the design I was looking at. I want to make a filter slot using some angle iron and then bolt the fan frame to the angle. I am using square furnace filters so a square fan was looking good. I will mount the motor to the top of the booth and have the belt connect to the fan off the side. This keeps the motor out of the air path and also allows me to mount it where there is room on top of the booth.

    I did actually build the booth today 4' wide x 3' deep by 77" tall. I installed castors on the base which are 3" so it is a total of 80" tall that will fit thru my door. Had to build it outside.

    I need to cut a hole in the side for the filter/fan mount, bolt on the angle iron and mount the fan to that. I have a box to wire a switch directly to the booth.

    The booth is closed in 3 sides full and about a little less than 1/3 in front. I will install a bar inside to hang the parts to be painted. I plan on installing a plastic shower curtain on the front to close off as much as I can when I am painting. I feel this should work fine.

    While we are at it any ideas on what rpm I should run it at. The motor is a 1/3 hp 1750 rpm. The fan as Steve has put a link is around 24" which is perfect as my filters and mount will be 25".

    Any help for rpm is appreciated so I can figure pulley size.

    Seems I can't type as fast as others posting
    Life Is Grand

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    • #17
      Originally posted by J Tiers
      1) If you spray any flammables, you DO want a fan that is safe for flammable vapors. Especially with a wood ( ) booth.

      2) With paint booth fans, the whole story is "face velocity". No, it's not measured as you run away, it is the air velocity through the front opening (face) of the booth.

      In a good industrial booth it is enough to flap your pants.... The idea is that all the overspray goes out the filter and none leaks out the front in some sort of eddy or reverse flow.

      You can figure the airflow by knowing the air volume the fan can move through the filter and ducts, and dividing it by the face area of the booth opening. In a "real" booth you get over 10 feet per second, IIRC.

      Looking at the FAQ on the Binks site http://www.binks.com/Technical%20Sup...y%20Booths.pdf

      I see that 100 ft/minute face velocity is suggested as the minimum.
      Answers my question for fan flow.

      Thanks

      I will check the fan and see what rpm will be needed for that flow or higher if possible.

      Right now I will be spraying aerosol enamel (spray bombs) should not be a problem. I do want to powdercoat as well but that I would feel better with a proper fan. Right now the paint is needed badly, the powder coating can wait.
      Life Is Grand

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      • #18
        Hey Klem you need a blower like this one it'll suck those fumes out



        "There is no more formidable adversary than one who perceives he has nothing to lose." - Gen. George S. Patton

        http://www.flowbenchtech.com

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        • #19
          Hey Jim, give http://surpluscenter.com/ a try. Look under electrical.
          By the time one earns a degree from the school of experience, he's too old to practice. Wayne

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          • #20
            spray booth

            I may be pointing out something that you have already ruled out as an option, what about a positive pressure spray booth? where the fan/ blower is supplying clean air to the booth and the exhaust is going over a splash plate and out , no fouling of the fan blades, and loss of efficency, also no dust etc creaping in through the cracks.


            Samuel

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            • #21
              I do not paint for a business just need something to prevent over spray. I paint tools. I have been spraying them in the bay side of the shop and I have no issue with dirt or dust. The stuff dries too fast. My purpose for the booth is not to try to solve any paint issues just to contain overspray.
              By using the booth it will filter and catch the OS and stop the paint dusting of the entire shop.

              Painting is not my thing. Just have to do it, when I finish tools I need to paint them.
              Life Is Grand

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              • #22
                Originally posted by Steve Steven
                Go to Grainger for fan, they have many of the type you are thinking about. You have to establish a account to buy from them, but it shouldn't be a problem for you, just use your business name. www.grainger.com

                Heres one, says "limited supply" but they have others.
                http://www.grainger.com/Grainger/items/3CC73


                Steve
                Yepper they are so limited they say they are discontinued and do not have them. I asked for the replacement
                and was told it cost 400.00 where the one in the link was 100.00 SO I guess I keep looking.
                Life Is Grand

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                • #23
                  Originally posted by cybor462
                  I do not paint for a business just need something to prevent over spray. I paint tools.
                  Cybor, like I posted earlier, I used a standard box fan with a furnace filter when I sprayed my Clausing. In this picture I pulled the plastic sheeting away from the fan so you could see it. It worked great:

                  "Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did."

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                  • #24
                    I did that at one point when I would paint my new engines and it killed the fan real quick. I will be using this booth a couple times a month so I need a little better setup. I called Grainger a few minutes ago and asked why they still showed that fan on the web if they no longer had it. i was then told they had a few. My local store I guess did not want to bother to get it for me.
                    I do have it ordered and it will be here tomorrow.
                    I think that will be the ticket.

                    Thanks for the suggestion.
                    Nice looking paint on that lathe. I really like that chip tray, nice and deep.
                    Life Is Grand

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                    • #25
                      Originally posted by cybor462
                      Nice looking paint on that lathe. I really like that chip tray, nice and deep.
                      Thanks Cybor -- that was when I was dry-sanding the Polane, so it was covered in a layer of chalk. It looks much better when I was done

                      I'm finishing-up some of the hardware, I'll post some pictures when I'm done...
                      "Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did."

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                      • #26
                        Will have the fan tomorrow and with luck will have a booth this weekend. Decided to buy a HF 1/2 hp motor for 60 bucks. Should do the job.

                        Lazlo..I sent you a PM
                        Life Is Grand

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                        • #27
                          Picked up the fan today. Wow it is much more massive than I expected.
                          http://www.grainger.com/Grainger/items/3CC73
                          It may be too big for the job but I have to use it now. Will take some head scratching but I will get it done.
                          Found a pulley and may make the second. Will check to see what they sell for. If they are not much I will buy one.
                          I will post pics when it is done
                          Life Is Grand

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                          • #28
                            Cybor,
                            I have one of these in my attic as an exhaust fan, been there for nearly 30 years, still on its origional bearings and motor (a used washinging machine 1/3hp open motor), so it should be fairly hardy. I would make a set of pulleys up that will give the fan the required 710rpm listed in the catalog, and put it in a short tunnel drawing from your paint booth, with the filters at the booth wall.

                            Steve

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                            • #29
                              Just found them on Graingers site. A 2" pulley for the motor and a 5" for the fan will give me 700 rpm's at the motor rpm of 1750.
                              Total cost for both pulleys is 20 bucks for cast metal. Should be ok and easier and cheaper then making them.
                              Life Is Grand

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                              • #30
                                Next question, do you guys think having roughly 56" between centers of the pulleys is too much without an idler? My thought is as long as it is tight and not flopping around causing vibration would be ok without an idler.
                                Any thoughts?
                                Life Is Grand

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