Spray Booth #4: Fan Unit

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Blog entry by VerteramoFurniture7 posted 08-27-2009 10:20 PM 6107 reads 0 times favorited 3 comments Add to Favorites Watch
« Part 3: My $4 Drying Rack Part 4 of Spray Booth series no next part

The spray booth fan system is finished. Just like the dry rack I built this out of scrap wood. If you remember the pictures of the spray booth when I started the blog you can see that the right side of the spray booth was away from the wall. That was because I had an old bench there that I was just using to hold junk. After spraying some larger items I realized that I needed more room in the booth. Since the bench was old and just holding junk I decided to take it apart. After taking it apart I decided to use the plywood I took from the bench and build the unit to hold the spray booth fan.
Now I got more room in the booth by getting rid of that bench and using the wasted space. I just have plastic stapled up around the booth at the moment but like I said in my second blog I want to put up a curtain that I can just slide back and forth. But that’s for another blog.

Spray Booth Fan Unit

I built this unit so I could use two fans instead of one and also make the filter area bigger. I used two 20×30 filters. They were the biggest filters I could find at my local Lowes. I saw some 23×30 online, which would have worked better.

Spray Booth Fan Unit

I designed the box to be the width of the two fans together. The width of two filters was smaller than the width of the two fans next to each other. I had to make a front channel to hold the filters instead of just cutting a dado in the case sides.

Spray Booth Fan Unit Spray Booth Fan Unit

Between the filters and the fans I made a chamber so the filters should pull in the air equally instead of just were the round fan is. If or when I build a better one I will not just put the fan on a shelf like I did in this one. The way I have it now you can see that the shelf sticks into the chamber and I think it might hinder the air flow. Something I did not think about until I had it built and put the fans in. When I redo it I will put a solid panel in the back and a cutout for the fans. That way it will also be more air tight.

The biggest problem I had with making the unit was the connection from the fans to the window. The window is smaller than the fans so I decided to go with the idea of having the sides on an angle in the back to fit the window. Well that was easier than it sounds and I think that is the big down fall of the unit. There are a lot of gaps and rough angles, which some duct tape will fix but I want to find a better way.

Option #1 Just cut the window opening bigger to fit the two fans. This will also gain me a few inches since I could put the fans right in the window.
Option #2 Build a chamber like I have behind the filter and in front of the fans.

Spray Booth Fan Unit

The other problem that I would love to hear your ideas about is how to close the window when not using it. In pro style ones I’ve seen they have flaps that open up once the fan is turned on. I don’t know if I am pushing enough air for this option. My best option so far (I just thought of it while typing this) is to get some shutters for the window and just close them when I am not using it and open it when I am. I will have to go outside and do this but that is not problem!

I just finished the unit and installed it so I have not used it to spray and finish yet. I will keep you guys posted on how well it works. I am already thinking about what I can do better with it and maybe even make it a four fan unit with more filter area. (But that will have to wait)

Spray Booth Fan Unit Spray Booth Fan Unit

All I had to buy was a new fan and the two filters (which will have to be changed when they get clogged). So for the cost I bet the fan unit will work better than the single fan I had with a filter taped to the front of it.

Thanks for taking the time and reading this blog. I would love to hear any ideas you have to make this better or any questions you have about it.

Now I just got to figure out some new lighting and curtains that can be pulled out when getting used and pushed back when not in use……..

3 comments so far

View woody57's profile


650 posts in 3696 days

#1 posted 08-27-2009 10:30 PM

I like this idea for an economical spray booth.
I spray allot of lacquer. I am concerned about drawing the vapors over the electric motor on the fan.
What do you think?

-- Emmett, from Georgia

View VerteramoFurniture7's profile


56 posts in 3530 days

#2 posted 08-27-2009 10:39 PM

I probably should have mentions this again, I only spray waterbased finish. The only problem I might have is killing a fan motor. If you are spryaing flamable vapors I would run a motor with a belt running thru the box to a fan mounted inside. That way the vapors wont get to the motor. You would also want to make sure you got explosion proof lights or your lights enclosed. I can’t help you out finding parts to make a fan with the motor on a belt. Hopefully some one here can direct us where to go for those parts.

View a1Jim's profile


117468 posts in 3846 days

#3 posted 08-28-2009 07:47 AM

very creative

-- wood crafting & woodworking classes

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