Replies

1. 
   WillGeorge | Apr 22, 2009 03:28am | #1

   I am not a finisher ..  Look/search Negative air flow?

2. 
   SteveSchoene | Apr 22, 2009 04:21am | #2

   It's a very challenging task to get rooms clean enough to avoid dust on slower drying finishes such as oil based varnishes.  I've done lots of things, but have reached the point where I just work in a clean space without stirring up dust, and expect with certainty that I will have to rub out the finish to remove dust nibs. If that's part of the plan from the beginning it's only important to avoid major dust contamination. 

3. 
   ring | Apr 22, 2009 08:18am | #3

   I've also had several finish rooms that were OK, but not perfect. It's not so easy to get real dust-free conditions anywhere near a normal shop. I don't think you really want to go all the way with this, but FWIW, the best spray room I ever had is undoubtedly my current one, and the principle is this:

   There is no exhaust fan for the room; on the contrary, it is pressurized by forcing air into it, and the excess just flows out (through baffles)from vents at floor level. The incoming air is well-filtered and comes from the ceiling, creating a downdraft throughout the room, which carries any overspray down and then away. Because the room is slightly pressurized, opening the door to enter causes air to blow out and not let dust into the room. Even with all this, a certain amount of overspray gradually settles on the floor as dust, and prior to doing a critical gloss finish we still need to wash down the floor. And BTW, don't go into the room wearing the same clothes you had on in the shop.

   David Ring

   http://www.touchwood.co.il/?lang=e&id=1