Spray booth fan

[Rick Beko]

For anyone that has a home built spray booth....what type of fan are you using to exhaust over spray or fumes?

[Matt Meiser]

I'm using a Dayton (Grainger) fan which has an aluminum prop and a TEFC (not explosion proof) motor. http://www.sawmillcreek.org/showthread.php?t=29077

[Greg Funk]

I used a 10" fan from acme (http://www.acmefan.com/PropWall.htm) FQ108 rated for about 600cfm. Return air is supplied through a 24" x 4" filter. Seems to work fine but it is not explosion proof. I've only sprayed water-based finishes and don't intend on spraying lacquer.

Greg

[Rick Beko]

If I am spraying water based products would a high velocity fan work such as the HVR24? Page 10

http://www.canarm.com/agricultural/pdf/pcircfans.pdf

[Greg Funk]

If I am spraying water based products would a high velocity fan work such as the HVR24? Page 10

http://www.canarm.com/agricultural/pdf/pcircfans.pdf
That looks like a portable fan pushing 7000cfm. It seems like a lot of flow and I am not sure how you would enclose it. If you have a high airflow I would be concerned about stirring up dust. How big is your spray booth?

Greg

[Rick Beko]

Before I build a spray booth I am looking at options. This unit has two speeds so it can run at a lower CFM. I would like to build a break down open booth in my 2 car garage. The fan would be on the floor directed either out the front of the garage or the side door which is 36" wide. If I have an open booth I am thinking I should be looking at a high CFM unit.

[Greg Funk]

Before I build a spray booth I am looking at options. This unit has two speeds so it can run at a lower CFM. I would like to build a break down open booth in my 2 car garage. The fan would be on the floor directed either out the front of the garage or the side door which is 36" wide. If I have an open booth I am thinking I should be looking at a high CFM unit.
Rick,

If you have an open booth I am not sure you even need a fan at all. Just use a respirator. Maybe I am not understanding what you are planning but if you build a booth with one open side and put a powerful fan in there I think you will just create a lot of turbulance and potentially suck in a bunch of dust and pollen onto your work. I would minimize air movement unless you can ensure that the incoming air is filtered somehow.

Greg

[Rick Beko]

Greg, the reason I would like a fan is to remove over spray and any fumes. I do not want to have finish landing on everything in the garage. Because it is a two car garage I am thinking higher CFM will be required. If I vent out the front of the garage then I can open the side door in the back to have some air flow.

Michael Dresdner has a video on FWW using portable floor fan.
http://www.taunton.com/finewoodworking/SkillsAndTechniques/SkillsAndTechniquesArticle.aspx?id=26509

[Matt Meiser]

That sounds pretty high. My shop is double the square footage of a typical 2-car garage and i have to open a door for cross ventilation or the fan quickly becomes air-starved. Here is the fan I have: http://www.grainger.com/Grainger/wwg/productIndex.shtml?operator=keywordSearch&search_type=keyword&QueryString=3xk57 I didn't pay anything close to that. I think it was about $100, including shipping from an Ebay seller who was selling several brand new fans that had only been used for testing. It was still in the original box.

Hopefully you are using an HVLP gun? The overspray will be very minimal. Nothing like the old guns.

Mine also works great for clearing welding smoke from the shop.

[Greg Funk]

Greg, the reason I would like a fan is to remove over spray and any fumes. I do not want to have finish landing on everything in the garage. Because it is a two car garage I am thinking higher CFM will be required. If I vent out the front of the garage then I can open the side door in the back to have some air flow.

Michael Dresdner has a video on FWW using portable floor fan.
http://www.taunton.com/finewoodworking/SkillsAndTechniques/SkillsAndTechniquesArticle.aspx?id=26509
Rick,

I see now what you are looking at. Michael looks like he has a fairly large fan. I'd still move my car out of the garage but for that configuration a larger fan would probably be beneficial. I spray in a 7' x 10' room and I don't mind if I get some overspray on the floor or walls.

Greg

[Rick Beko]

The cars would not be in the garage when I spray but I want to limit the amount of finish in the air.

[Jon Dieterlen]

Rick, I spray in one end of the shop right in front of a 36" man door. I open a couple of windows at the other end of the shop and place a 20" aluminum blade venturi fan in the door. I cut a piece of OSB to fit tightly in the door opening and mounted the fan to the opening. My fan is the same dayton fan as shown in the previous post. I put a drop cloth on the floor and cover nothing else. I have been spraying 20+ gallons of conversion varnish per month for the past 3 years. Absolutely no overspray has built up on anything. The key is to make sure the fan seals reasonably well in the door, and to use a fan designed for sucking. Some fans are designed to blow and not suck.

JON