Build Your Own Spray Booth
We recently created our own hobby spray booth, it worked out very well for us so we created this article to show you how we did it. Choose the type of wood you prefer, follow the instructions, and start building your spray booth now.
Hobby Spray Booth Specifications
- 265 CFM exhaust blower, 115 volt, 1.9 amp, 1500 RPM.
- 7 foot long grounded power cord.
- 24 gauge galvanized steel mounting panel for blower.
- 24 gauge galvanized steel filter rack, for use with standard furnace replacement filter. 12" x 24" x 1"
- 4 inch round exhaust duct outlet for easy venting (standard dryer vent)
- 1/2 inch thick plywood for bottom, sides, back and front panels.
- 1/4 inch thick plexiglass for top panel.
Choosing A Blower For The Hobby Spray Booth
We know that Grainger's retail pricing can be pretty expensive so we suggest you shop around, if cost is a concern. If you choose to use a different blower and your exhaust duct run is longer than 8 feet, make sure that it will hold up to static pressure similarly to the Dayton blower.
Make sure the important specs are similar to the image below.
Cording The Blower
These types of blowers do not come corded so you will have to get a grounded power cord and cord it yourself. This process is extremely simple, it's literally just 3 wires; 1 positive, 1 negative and 1 ground. Don't worry you won't need any prior experience or knowledge of electricity to cord the blower.
Fan Mount Panel
We used 24 gauge galvanized steel for the fan mount panel so that we could have top or bottom discharge just by flipping the panel. We externally mounted the blower so the motor windings would not be damaged by harmful paint and solvents.
Learn more about the Fan Mount Panel
Square To Round Fan Adapter
When we built our spray booth we created our own square to round adapter. People started asking us where to get an adapter, so we started looking for an adapter that would work. After much research we came to the conclusion that there were no adapters commercially available that would properly transition from the square flange of the blower to a round duct outlet. This is when we realized that we could add value if we made this adapter commercially available.
This product enables the Dayton Blower 6FHX9 to be vented using standard 4" inch diameter circular duct. This adapter can be used with rigid, semi-rigid or flex duct.
Note: You must bend the flange flush with the blower housing for the adapter's bolt pattern to lineup properly.
Warning: It may not fit other blowers because flange sizes and bolt patterns vary.
Learn more about the Square to Round Fan Adapter
When we created the filter rack for our spray booth we used 24 gauge galvanized steel, we are aware that it won't be possible for most people to use this material. The filter rack can be made out of wood it could be the same plywood you use to build the booth. See below if you want to buy a Vent Works steel filter rack.
Learn more about the Filter Rack
We decided not to include internal lights in the booth itself, instead we used Plexiglas as the top panel. This way light would easily shine down into the booth and we would be able to quickly adjust the light depending on where we are and what we are doing. We recommend 1/8" to 1/4" Plexiglas, but you can use any translucent material. Local hardware stores should have something usable in stock but thickness, size, and materials may vary. We used a table saw to cut the material but a circular saw will work. Make sure to set the saw blade depth so it just clears the material or the material may split, crack, or chip.
The spray booth used in this article was constructed using a Vent Works Filter Rack and Fan Mount Panel, but if you prefer you can make those parts yourself using wood. If you do use wood for the fan mount panel you will have to create the panel, cut the hole, drill pilot holes in the panel and in the blower, get proper hardware and weather seal.
Below are images of a booth built using the same plywood for the booth, filter frame, fan mount panel, and the top panel (instead of the Plexiglas).
Is this spray booth explosion proof?
No, to be classified as explosion proof, a vapor proof motor and switches must be used. Explosion proof components are very expensive and would make this booth cost prohibitive. However, for an explosion to occur, the concentration of flammable vapor must be at or above its lower explosive limit (LEL). In most cases, if the fan is running before vapor is introduced, the concentration of vapor will be diluted and less than its LEL.
Will the spray booth require maintenance?
Yes, periodically filters should be replaced and ducts should be inspected for obstructions. This will ensure proper air flow which will reduce the risk of vapor buildup.
How far can I run the exhaust duct?
Exhaust ducting adds friction (resistance to airflow) therefore you should locate the booth as close as possible to the exhaust termination. Vent Works recommends no more than 15 feet of exhaust duct when possible.
Where can I buy exhaust vent pipe?
The hobby spray booth that we created has a 4 inch round exhaust outlet that can be vented with standard dryer vent ducting, which is readily available at most hardware and home improvement stores.
Will the exhaust air from the spray booth damage vegetation near the exhaust outlet?
No, if the booths filter is in place and properly maintained, over-spray and particles will be removed with no damage to plant life.
Cut List & Assembly
Download Cutlist & Assembly Instructions Below
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