paint booth fan

[swvega]

I'am building a paint booth in my new shop. Size is 15x30x9ft ceiling. I've got 3, 8ft. lights on each side wall running top to bottom. & 5, 8ft. lights in the ceiling. Intake fillters are to be 24"x15 ft.in two rows for a total of 4'x15ft. with heat ducted in from a gas hanging overhead furnace.At the rear of the booth in the ceiling. Exhaust chamber will be 5ft high x15ft across with paint arrestor filters. At the bottom in front of the booth. Opening to outside is 2'x2' on the one side wall. I just found a used binks paint booth exhaust fan that a chev dealer here in town had removed for $100.00. It's 24" across and had a 3hp 3 ph motor at 1740 rpm. Problem is I have single ph power so need to replace motor. Think I could go with a 1 1/2 or 2hp motor and not have any problems with it ? I will try to post pictures of the booth this weekend. This just a part time shop so I dont have any codes to follow.

 

[Uncle Buck]

I'am building a paint booth in my new shop. Size is 15x30x9ft ceiling. I've got 3, 8ft. lights on each side wall running top to bottom. & 5, 8ft. lights in the ceiling. Intake fillters are to be 24"x15 ft.in two rows for a total of 4'x15ft. with heat ducted in from a gas hanging overhead furnace.At the rear of the booth in the ceiling. Exhaust chamber will be 5ft high x15ft across with paint arrestor filters. At the bottom in front of the booth. Opening to outside is 2'x2' on the one side wall. I just found a used binks paint booth exhaust fan that a chev dealer here in town had removed for $100.00. It's 24" across and had a 3hp 3 ph motor at 1740 rpm. Problem is I have single ph power so need to replace motor. Think I could go with a 1 1/2 or 2hp motor and not have any problems with it ? I will try to post pictures of the booth this weekend. This just a part time shop so I dont have any codes to follow.

Or if you ever plan on adding more 3 phase equipment in the future such as metal lathes, milling machines and the like you could instead do a phase converter.

 

[Industrial Concepts]

I'am building a paint booth in my new shop. Size is 15x30x9ft ceiling. I've got 3, 8ft. lights on each side wall running top to bottom. & 5, 8ft. lights in the ceiling. Intake fillters are to be 24"x15 ft.in two rows for a total of 4'x15ft. with heat ducted in from a gas hanging overhead furnace.At the rear of the booth in the ceiling. Exhaust chamber will be 5ft high x15ft across with paint arrestor filters. At the bottom in front of the booth. Opening to outside is 2'x2' on the one side wall. I just found a used binks paint booth exhaust fan that a chev dealer here in town had removed for $100.00. It's 24" across and had a 3hp 3 ph motor at 1740 rpm. Problem is I have single ph power so need to replace motor. Think I could go with a 1 1/2 or 2hp motor and not have any problems with it ? I will try to post pictures of the booth this weekend. This just a part time shop so I dont have any codes to follow.

A 2hp motor mounted to a 24in dia. fan should give you 8094 cfm @ 1/4 in. static pressure. For every 90 deg. elbow that you have add 1/4 in. static pressure. It shoulds like you are making a semi verticle down draft booth.

I would go with a 2hp or 3hp single phase motor. You will want to clean the fan prior to installing. Clean it good, any speck of build up can throw the fan out of balance.

 

[Weedwaka]

What are you guys doing for air flow adjustment / balance ? Adjustable baffles ?

Post pics

 

[D KRAGER]

If you get a new motor, I believe it needs to be explosion proof to be on the safe side.....

 

[Industrial Concepts]

If you get a new motor, I believe it needs to be explosion proof to be on the safe side.....

If he has a tubeaxial fan & the motor is 5ft. away from the enclosed spraying area he will not need a explosion proof fan. The motor will not be in the air stream.

 

[Industrial Concepts]

What are you guys doing for air flow adjustment / balance ? Adjustable baffles ?

Post pics

This set up sounds like a simple semi verticle down draft booth. If that is the case, there is no balance in the booth other than balance across the exhaust area. Without replacement intake air the spray area will be operating under negative air flow. This is very common with many spray rooms/booths. In the winter either he will **** out all of his heat or heater will be burning at high fire trying to play keep up. For a home/hobby shop or even a business with low budget not pushing a lot of product thru each day he should be fine.

One other thing the whole shop will be under negative pressure when the fan is on. Doors will be hard to shut or open, depending on the swing.

But still it is better to get the fumes out.

The other issue is what happens to the air (overspray) when it go outside. Is he just putting the fan in a side wall without duct, neighbors may not like that depending on the area where he lives.

 

[swvega]

My hanging furance will be about 6-8 ft from a 3' outside entry door. I thought I could open that door a slight bit to let air into the building when the fan is on.The main shop will be heated with in floor heat and I realize it may get a little cold in the shop when the fan is on and door open.This should also make sure the fan draw doen't **** the flame out of the furance. I plan to do as little painting as possible during cold months.As I said the exhaust chamber will have a row of paint arrestor filters 5' highx15' before it gets to the inlet to the fan. The fan that I picked up is a binks paint booth fan with the motor mounted outside of the air stream and run by two belts running to the fan blade though and inclosed tube. The fan is to be mounted out side of the booth on and outside wall of the building. Once the air goes though the fan I plan to put a 2' diamitor chimmeny up the back of the building on top of the fan to about a foot above the roof line. I worked for a small body shop years ago that had a set up like this and it worked great I just wasn't sure if a smaller motor would pull the fan. I would guess the fan now must be pulleyed up to about 2500 rpm. I dont think I need that much fan draw. I'am guessing about 5000 cfm would be more than enough for the size of my booth.

 

[Industrial Concepts]

My hanging furance will be about 6-8 ft from a 3' outside entry door. I thought I could open that door a slight bit to let air into the building when the fan is on.The main shop will be heated with in floor heat and I realize it may get a little cold in the shop when the fan is on and door open.This should also make sure the fan draw doen't **** the flame out of the furance. I plan to do as little painting as possible during cold months.As I said the exhaust chamber will have a row of paint arrestor filters 5' highx15' before it gets to the inlet to the fan. The fan that I picked up is a binks paint booth fan with the motor mounted outside of the air stream and run by two belts running to the fan blade though and inclosed tube. The fan is to be mounted out side of the booth on and outside wall of the building. Once the air goes though the fan I plan to put a 2' diamitor chimmeny up the back of the building on top of the fan to about a foot above the roof line. I worked for a small body shop years ago that had a set up like this and it worked great I just wasn't sure if a smaller motor would pull the fan. I would guess the fan now must be pulleyed up to about 2500 rpm. I dont think I need that much fan draw. I'am guessing about 5000 cfm would be more than enough for the size of my booth.

If you look at any of the cross flow automotive spray booths the cfms are from 9000 cfms & up. You will probally be fine with a 2hp motor with this size fan. I sold a couple Global Finishing Solutions select series booths last year & they had 34in dia fans with 2hp single phase motors. The main thing is to get the fumes & over spray out so you don't breath the garbage. The set up your talking about will be a little slower pull out. There are still a lot of shops that don't have booths.

Is your dry wall up yet? If not, I would suggest building this room out of metal studs & 2 layers of 5/8in Fire resistant drywall, this will give you a 2 hour fire rating (check with drywall supplier). Good Luck with your project.

 

[swvega]

I forgot to add that the booth will be sheet rocked and taped with .030 thick white painted aluminum sheets glued to the sheet rock with sealed plexa glass sheets over the light fixtures.

 

[Industrial Concepts]

Where is Princeton? I think I have been there. What industries do you have there?

 

[Industrial Concepts]

I forgot to add that the booth will be sheet rocked and taped with .030 thick white painted aluminum sheets glued to the sheet rock with sealed plexa glass sheets over the light fixtures.

If you have not done this yet, I would not use the aluminum on the walls. It is great for being water resistant & bright white. The fire rating is not good. It is not approved for spray booth construction.

 

[swvega]

It is about 45 miles north of the twin cities. There is some industries here in town. I just moved here a couple years ago and started what is to be my retirement shop last feb.

 

[Frankishelby]

Does someone have pics of their fans?