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Booth Design

PostPosted: Mon Sep 02, 2019 5:58 am
by simso
So wondering if people can give some recommendations. Trying to improve finishes of the gun.

I have a paint booth, 3m by 3m, not professionally built or designed, but by yours truly.

It has a paint extraction fan that is strong enough to pull the doors closed to the booth (photo taken from standing in doorway), and one area of air inlet 1meter by 1metre with filter, however the air inlet is on one side of the booth (left hand side of this photo out of view) and the extraction is at the opposite side in the centre as per photo.

Typically i only paint one instrument at a time, in this photo i was doing small airbrush touchups, covering repaired cracks.

Should i paint in the air stream or outside of the airstream.

Should i attempt to make another air inlet on the other side to balance the airflow?


Re: Booth Design

PostPosted: Wed Sep 04, 2019 7:32 am
by Doright
You shouldn't be able to feel any air movement in the booth at all.

My Booth will suck the door shut with a Bang! but yet I cant feel any air movement inside the booth, Now if I start spraying Clear coat heavily on a Car the over spray just slowly moves towards the exhaust filter trap, it's the only time I really see any over spray is when I am spraying clear coat.

A lot of guys make big mistakes designing their paint booths only to find out they have a nice wind tunnel to Paint in. You cant paint in a wind tunnel.

There are a lot of threads on Paint booth design a search should reveal many threads on the topic.

But any way your design is way off, I have no idea if that is your inlet or exhaust bank in that pic but its way too small for either. also I have no idea if your design is positive or negative flow. How to go about trying to fix it will matter.

Re: Booth Design

PostPosted: Fri Sep 06, 2019 4:16 am
by simso

You re-affirmed my thoughts, i can feel the air draw in the booth, really easy, its like a cold breeze.

The photo is the outlet side.

I put a second opening this week into the inlet side, so now i have two areas 1m by 1m above waist height allowing filtered air in.

Will look this week at making a paint wall, that is i will remove that base, cut it half way down the wall before it starts to taper and then make a lower flat wall that i see in most peoples booths


Re: Booth Design

PostPosted: Fri Sep 06, 2019 4:19 am
by simso
Will take some photos tomoz of my current inlet side


Re: Booth Design

PostPosted: Fri Sep 06, 2019 12:01 pm
by OldFatBald
I used to design portable indoor live fire shooting ranges which requires a lot of laminar flow so as not to feel like the shooter was standing in a wind tunnel.

To get rid of that concentrated air flow, you need to distribute the intake air through a plenum.

How many fans do you have and where are they located? Adjustable fans on both the intake and exhaust are desired (extra $$), but not required.

For the ranges that I worked on, I designed an air wall using acrylic sheets with a bunch of holes to distribute the air from behind the operator. This allowed the air entering a frontal area of 8' high x ~9' wide vs the cross sectional area of a 36" round fan.

Hope that makes sense?

Re: Booth Design

PostPosted: Fri Sep 06, 2019 7:44 pm
by simso
Here is the inlet side of the booth

Centre view,

Left view

Right side

Re: Booth Design

PostPosted: Sun Sep 08, 2019 6:36 am
by simso
Had a person come in that is an engineer and deals with flow designs, they showed me the outlet side is my issue not the inlet side.

If I put my hand above the grate on the outlet it feels like a small blower pumping air back i to the booth coming, so its collecting dust from my outlet grate and then sending it up to the inside of the roof and then drops back down into the air stream.

Got some work now to cut and reshape a few things


Re: Booth Design

PostPosted: Mon Sep 09, 2019 4:16 am
by simso
The alterations have begun, i have cut away the front of the booth so far and started to lay out the area to attach the filters too.

Tomoz i have to cut all the sides of the old plenum away, then start blocking and filling all the gaps in.