Hi,
Friend has a shoe repair business and needs help with dust collection as it’s in a small place. The one glitch is for a small spray booth. She basically uses a spray paint type dye. Noxious fumes; probably flammable.
What she has now is a typical unsealed squirrel cage affair with a filter just in front of it. Old fashioned and inefficient. The “spraybooth is basically a 2’x2’x2′ box with this filter squirrel cage affair on top. The exhaust is a long draw 4” hose which doesn’t help.
My idea is to incorporate a small 1.5 hp dust collector, not a shopvac but the kind with a bag on the motor and a hose to attach to machines. I would attach the hose to the top of the box descibed above and run it about 8 feet to the motor which will exhaust out side.
If the filter is changed and maintained little of the “dye” should reach the motor. All the same does this sound feasible?
I’ve done tons of searches and only find large room size spray booths or very small hobby types. aqny other suggestions welcome.
Thanks,
Warren
Replies
Warren,
Most fume hoods that I have experience with use a squirrel cage style blower to exhaust the fumes out of the building. The blower sits on the roof and sucks everything up a 6" or 8" duct.
You might be better off with a used furnace blower that allows a big suction area and lots of volume. You can then alter the flow with different pulley diameters.Your dust collector will not permit much flexibility.
Dust collectors use blower technology for moving air and particulates. Your friend only needs air movement and lots of it.
But I am not a fume hood expert either.
Don
The reason I am resisting a spray booth setup is this: it seems to me that it's one of those cases where you have to go all the way or stay home.
Flammable fumes want systems that are called "explosion proof", meaning that it won't generate any sparks that can ignite flammable fumes. Explosion proof fans, motors, lights.
This is all based on my reading and research-- I haven't done it, and my research was just enough to convince me that I didn't want to do it until I could invest the time, money, effort and space to do it right.
It seems to me that an exhaust system that wasn't a proper setup could actually increase the chances of trouble, simply by collecting the fumes and supplying the spark.
So until I can do it right, I'll find and use different, non-flammable ways of finishing.
Good luck!
Yea...thanks,I'll scrap the dust collector model.I've continued my research and see at minimum a TEFC motor would be in order. I was starting to look at heater blowers that could be remote, but the best bet is to vent out side and there's only a door nearby so we need a movable model.Currently it's a 4" dryer vent for about 10' T'ing to the bathroom roof vent. I know cheesy don't begin to describe the set up and it doesn't work even before it broke!Still searching....Thanks,Warren
Been there done that!
Most of those fumes are heavier than air, so you need a down draft style bench.
Forget the filter, mount a squirrl cage out side run a 6 inch duct to it.
TEFC is only really nessecary if the motor is in the air stream and indoors.
Best number I could come up with is 150 CFM per square foot of vent space. so 2 foot square needs 600 CFM.The shoe industry has limited choices of non VOC cements and alot of the few remaining shoe repair shops, gave up dying shoes due to the costs of equipping a shop.But you still need to get rid of the cement fumes, the new one's formulated for the polyurethane and assorted plastics are real nasty stuff!
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