my spray booth

glennster

Well-known Member
heres a couple pictures of my downdraft spray booth at the shop. positive pressure, 1.5 million btu main burner. 98% efficient air filtration system.
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The indoor outdoor carpet is supposed to be the latest in dust control vs a concrete floor. We are getting ready to made the switch to waterborne paint system.
 
I have not used a downdraft, do you pull your inlet air thru filters fron heated shop area? Are the lights explosion proof or they sealed and accessed from outside the room. Ours was in plastered wall and had about a dozen knobs to remove to open when changing bulbs. We pulled in thru door filters and filters each side of door, a large Devilbiss belt driven fan with baffles across other end wall (was state of the art 1960s). One of the guys had worked on a Pinto, front end repair and had to push in paint room so a couple of us helped push. It was 3 on the tree,had switch on to steer reaching thru window. When we got on room he thru up in reverse and you can guess what happened. Tagged the wall below the baffles pretty good, guy ended up with a complete paint job.
 
The booth uses outside air. There is a prefilter before the main burner, then the first drive fan that forces heated air thru filters in the ceiling. The grates in the floor cover a second ser of filters that remove any over spray. A second air handler sucks the air out and vents outside. Both fans are 10 hp 3 phase motors. There are dampers that control booth air pressure. On bake cycle we usually run 145 to 150 degrees. On spray cycle, we maintain about 85 degrees. We have a 3 inch high pressure natural gas line that feeds the main burner. It will use some fuel!!!
 
Yup, the lights are explosiion proof. I have 2 120 gallon 3 phase air compressors, there are pre filters on the compressors, the water traps on the tanks and outbound air. From there it goes to a big cam air unit that has a pre moisture filter, particle filter, coalescer oil trap , then a dessicant unit. From ther it gois to the booth for the two final filters. We run 175 psi line pressures.
 
We had large wall mounted hot water rad. that went full legnth of wall,it was a collector for a lot of dust behind it and heat really droped when someone started opening outside shop doors. Ours was large enought room for the older cars and pick ups but when 4x4s and crew cabs came along it was too small. Had a wash pit in front of room where wet sanding was done. If I ever get out your way, I like to stop in. Jim
 
When I started in 1959, we had one 4 cylinder Devilbiss and added and stacked another one like it in 1961 80 gallon each. A few yrs later added 3rd comp. an upright 80 to them and still ran short of air then went with 200 gal, 30 HP Quincy. That thing you could feel in the concrete floor when it started. I have on of the 4 cylinder DeVilbiss here at home and use it every day.
 
Glennster,

All I can say is wow! nice job. I create a a visqueen room within my shop. I do use a exhaust fan thru a window and I do use a air supplied respirator system.

I spray Omni MTK with some success. I like the carpet floor idea. I have been using visqueen taped to my epoxy shop floor to save the floor.

My issue more than dirt is the visqueen floor being sticky. My concern is the carpet would be the same. Any other ideas to "help with" the overspray on the floor, thus tracking out into nice area.
 
if you are getting a lot of overspray on your floor, your exhaust fan isnt clearing the booth fast enough. if i am correct, you built a crossflow style booth where air is drawn in on one side of the booth and exhausted on the other side. are you running any filters? i would put some furnace filters on the air intake side of the booth to handle any incoming dust, then on the exhaust side, put some filters over the exhaust fan to catch any overspray before it gets to the fan. you may want to increase the size of your exhaust fan to help clear the booth. before we went with the carpet on the fllor, we would wet the floor down with water just before painting. another thing is to get your project in the booth, close it up and run your exhaust fan. get your blow gun and blow everything off and let the fan pull any dust out. let the booth run for half an hour to clear andy dust out, then wet the floor and have at it. are you using an hvlp gun? they really cut down on wasted materials.
 
What are the dimensions of your booth? I'd be interested in seeing some pictures of the mechanicals that run the heat and ventilation.
 

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