Replies

1. 
   chuckh | Jul 07, 2006 07:48pm | #1

   I asked myself that same question while watching that video just as I did many years ago while setting up my furniture repair shop.  So back then I stopped in at the local motor repair shop and asked them the question.  The owner took me back into his paint booth and showed me his explosionproof motor/fan which was nothing more than a standard electric motor with duct tape over the intake slots.  His own version of TEFC (totally enclosed fan cooled).  So I did the same, but I did very little spraying.  It worked for him and it worked okay for me, and I don't know what Mr. Dresdner has going there, but nowadays your insurance company and local fire codes may frown on the practice.  Not to mention that I just don't think it is a good idea.

   -Chuck 

1. 
   Rich14 | Jul 08, 2006 12:31am | #3

   Sandking, Chuck

   All induction motors are inherently explosion proof, as there is no arcing in an induction motor as there is in a universal (AC/DC motor). It is possible that switch contacts in the motor start housing could be a problem, but most such boxes are sealed at the motor. Such switches are in the capacitor start circuitry.

   If the switching box is not sealed, that should be done, or those components can be moved elsewhere (by an electrician or yourself if you are comfortable around electric circuits). Small motors generally don't need capacitor starters, so there may be none, therefore no need for attention to that problem.

   The main switch for the fan should be outside the spray booth, but inside the structure in which the booth is located, isolating it from exhaust vapors which should be vented outside the booth (of course) and the main structure.

   With attention to these two sources of electric sparking, you will have a reasonably "explosion resistant" (nothing is really explosion proof) situation.

   Rich

1. 
   chuckh | Jul 08, 2006 01:36am | #4

   Rich,

   Thanks, that's good information.  I suppose that's why the motor man and Mr. Dresdner weren't concerned.  So Dresdner's instruction to use a filter and the duct tape are just to keep finish from building up in the motor.

   -Chuck

2. 
   dssokhey | Jul 08, 2006 12:30am | #2

   but if and whenever you are using water based paints, i think you can use the ordinary fan without any wory