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Drop down spray booth w/ exhaust fan for woodshop

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Project by Jerry posted 10-25-2014 02:45 PM 5258 views 22 times favorited 13 comments Add to Favorites Watch

The spray booth is 11’x11’ with 10’6” ceiling. I cut 3/4” plywood into 2” strips and made 4 sets of frames. Drilled holes in two of them, placed 3/8” tee-nuts in one of those and stacked it under a solid frame which gets attached to the ceiling. The second drilled frame gets 6” bolts and washers that bolt into the tee-nuts and suspends the third frame that the fabric walls are stapled to. (Leaving a 4.5” air gap at the top as a fresh air inlet) The fourth frame is stapled to the bottom for weight and to stabilize the walls once the exhaust fan is turned on. A series of Shade Tape (w/ rings) allows the curtains to fold and collect near the ceiling when raised without hanging down too far. Small rope is looped through the Shade Tape and closed eyelets to raise and lower the panels. The exhaust fan is a 24” box with a recycled furnace squirrel cage fan, (2) 24”x24”x2” pleated furnace filters and a 5” tall exhaust port that tucks under the garage door and two panels that close off both sides of the exhaust fan that are held in place with a few rare earth magnets. Constructive criticism is always welcome!!

thanks for looking,

Jerry

-- Jerry - Rochester, MN *Whether you think you can or you can't, you are probably right* - Henry Ford





13 comments so far

View jack1's profile

jack1

2057 posts in 3494 days


#1 posted 10-25-2014 03:08 PM

Looks a lot like the old auto spray booths I remembe in body shops. Nice work Jerry.

-- jack -- ...measure once, curse twice!

View a1Jim's profile

a1Jim

115206 posts in 3044 days


#2 posted 10-25-2014 03:14 PM

Seems like it might work out .I can’t help but wonder if it gets’s all dusty when storied away? I’m also trying to figure out where you exhaust fan vents to ?

-- http://artisticwoodstudio.com Custom furniture

View Jerry's profile

Jerry

221 posts in 3005 days


#3 posted 10-25-2014 03:25 PM

It pulls harder than I expected. Not only keeps the over spray in check, but works well enough to exhaust the fumes/smell also.
It exhausts outside under the garage door. This was the third design of the box & filters. I’ve coated the filters with blue spray paint while a friend stood outside with printer paper in front of the exhaust port and no blue on the paper. The filters did a good job on that test, but during normal use the clear or paint will be dry by the time it hits the filters.
I also open a window in the shop to allow fresh air to aid in venting and circulation.

-- Jerry - Rochester, MN *Whether you think you can or you can't, you are probably right* - Henry Ford

View a1Jim's profile

a1Jim

115206 posts in 3044 days


#4 posted 10-25-2014 03:33 PM

Thanks for the info ,I didn’t notice that you booth was up next to you garage door. Do you have to wipe the fabric down to get rid of any dust that accumulates when not in use before you spray ?

-- http://artisticwoodstudio.com Custom furniture

View Scott Landry's profile

Scott Landry

160 posts in 937 days


#5 posted 10-25-2014 04:03 PM

I love the fan unit. I’m going to do that. I usually hang up a tarp from a cable making it more like a curtain and separate my workshop in half then place a fan in the window, but I like your fan idea better.

-- Every project is an opportunity to acquire new tools and any solution that requires buying a new tool is the correct one.

View LesB's profile

LesB

1237 posts in 2910 days


#6 posted 10-25-2014 04:23 PM

Looks like a great idea. I have one concern your filters takes care of the chance of small particles combusting but when spraying with solvent or hydrocarbon based products there is a chance of them igniting from a spark. How spark proof is the blower motor. I built a small portable spray booth years ago for someone and had to find a spark proof motor for the exhaust fan to make sure there was no fire or explosion hazard.
Also your filtered blower can also serve as a air cleaner for the shop.

-- Les B, Oregon

View luv2learn's profile

luv2learn

2466 posts in 1770 days


#7 posted 10-25-2014 05:48 PM

Great setup Jerry. I especially like how you hung the fabric curtains.

-- Lee - Northern idaho~"If the women don't find you handsome, at least they ought to find you handy"~ Red Green

View timbertailor's profile

timbertailor

1592 posts in 891 days


#8 posted 10-25-2014 08:39 PM


.............................. I have one concern your filters takes care of the chance of small particles combusting but when spraying with solvent or hydrocarbon based products there is a chance of them igniting from a spark. How spark proof is the blower motor? I built a small portable spray booth years ago for someone and had to find a spark proof motor for the exhaust fan to make sure there was no fire or explosion hazard.
Also your filtered blower can also serve as a air cleaner for the shop.

- LesB

You make a very good safety point(s) that many fail to consider.

And it is not just the motor, but the fan blade, cage, and all associated hardware used to keep the blade and guard in place.

Flow must also be considered and filters sized accordingly. Few filters can handle the flow and\or provide adequate filtration.

-- Brad, Texas, https://www.youtube.com/user/tonkatoytruck/feed

View DocSavage45's profile

DocSavage45

7708 posts in 2309 days


#9 posted 10-25-2014 09:00 PM

Great Blog!

Learning and planning. LOL!

Nice shop!

-- Cau Haus Designs, Thomas J. Tieffenbacher

View Jerry's profile

Jerry

221 posts in 3005 days


#10 posted 10-26-2014 12:19 AM

Les & TimberTailor: I have a good friend in the autobody business and when I spray paints, they are waterborn not solvent based. I have had great luck with the Minwax Polycrylic and a waterborn clear from Varethane. No worries on combustion in my booth with the products I use.

Jim: I have a shop vac mounted on the wall to clean any dust from the pleats before spraying.

-- Jerry - Rochester, MN *Whether you think you can or you can't, you are probably right* - Henry Ford

View OSU55's profile

OSU55

1063 posts in 1456 days


#11 posted 10-26-2014 12:44 AM

Did the same thing several years ago, works great! The explosion possibilities are why I moved to waterborne finishes several years ago.

View 489tad's profile

489tad

3100 posts in 2478 days


#12 posted 10-26-2014 11:10 AM

thank you for posting. It has provided a lot of good information. Well done.

-- Dan, Naperville IL, I.G.N.

View whitebeast88's profile

whitebeast88

4092 posts in 1657 days


#13 posted 10-27-2014 11:19 PM

great idea,very handy to be able to store it at the ceiling when not in use.thanks for sharing.

-- Marty.Athens,AL

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