Suggestions on making first spray booth

[dawgvet]

Ok, so after reading here and other places where I need to abandon my bathroom fan-powered plastic tub spray booth, I bought a Dayton squirrel cage blower and now would like some tips or plans on how to build  a decent booth for cars. The fan is rated for around 400 cfm. I am pretty handy so I was thinking of building it out of plywood. What size opening would work for this size fan? 

Anyone have any links to good booth plans? 

What are the pro/cons of downdraft vs rear-mounted fans? 

Any help appreciated,

Jed

 

[Bill Eh?]

Jed, this linked website might be of use to you.

https://vent-works.com/blogs/the-ventilation-blog/15945741-diy-hobby-spray-booth

 

 

Edited May 21, 2017 by Bill Eh?

[niteowl7710]

The biggest killer to your CFM (other than a plugged up filter) is how long your "run" is to the outside vent. I have a professionally made down-draft booth rated at around 400 CFM and they recommend no more than 8' of distance between the booth and the exit vent before the fan loses it's ability to flow at it's rated power. 90° turns and significant elevation changes will also diminish the effectiveness. 

Edited May 21, 2017 by niteowl7710

[mrmike]

The link I am supplying is from a model railroad site and goes back to 2003.  I used these plans to build my own paintbooth and it works great.  It's very sturdy and and quite efficient.  I made a variation to the plans so I could use a 16 x 20 inch furnace filter.  For your consideration and remember...safety first!

http://www.railroad-line.com/forum/topic.asp?ARCHIVE=true&TOPIC_ID=5019

For my paintbooth, I used a range hood fan that I found at a swap shop and had all the other electrical items at home.  I made sure that all connections where sealed and that the fan was a non-armature type of fan.  I vent the paint fumes out with a dryer vent hose kit that I bought from Home Depot  

[dawgvet]

Jed, this linked website might be of use to you.

https://vent-works.com/blogs/the-ventilation-blog/15945741-diy-hobby-spray-booth

 

 

Bill, those plans were very good. Thanks for the link. 

[Miatatom]

Here's what I came up with. It's gone through several modifications. I don't use the gloves on the front any more.