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How to Build and Design a Powder Coating Oven

February 26, 2020

An oven or infrared heating is necessary to cure the powder over some materials for the powder coating process. In coating large parts, you can either purchase a fairly expensive powder coating oven or make your own oven. If you want to build and design your own powder coating oven, then here are the steps that you have to follow for a successful powder coating oven project.


To start with the framing, you must assemble the floor square section first. You must overlap the studs so that they can sit inside of each other on the corners. Keep them in place with a locking c-clamp and place a rivet on each corner. Add more rivets on each corner until all four sides are secured. Repeat this process on your walls and ceiling. Just make sure that you rivet the walls on top of the floor and the side walls to the floor and the back wall. 

Interior Skinning

Once you have done with the framing, you must begin skinning it with sheet metal. You must obtain long straights cuts of galvanised steel sheet metal so that you can keep your oven free from rust. The recommended thickness of the sheet metal ranges between 16-gauge to 26-gauge. For this project, you can place a 16-gauge sheet metal as the first layer on the inside of the floor and rivet into place. Then, add some stud supports on the bottom. 

As soon as you have skinned the entire oven interior, you can now work with your heating elements by cutting four cut-outs using a pneumatic cut-off tool. Your cuts must be a straight-edge and a square.

Convection System

You can now install a convection fan on the top of the oven for it to circulate the air from the top of the oven down to the bottom. This fan helps equalise temperatures throughout the oven. 

The ductwork inside the wall, on the other hand, brings air from the top to the bottom. It is wrapped around from the sidewall to the top of the oven to the fan. And for you to prevent the forced air from leaking into the oven frame, you must use a high-quality sealant for your ductwork. 

When constructed correctly, your convection system can pull up the air through the top of the oven. This air is then ducted back down the sidewall and into the bottom of the oven. This system can prevent temperature fluctuations while the oven performs powder coating.


Building recessed lights on your oven can help you prevent interference with powder coated items. You must install the porcelain-lamp holder onto the inside of the 6-inch duct cap. Holes must be drilled for the lamp-holder mounting hardware. Additionally, a centre hole must be drilled to obtain access to the wiring terminals. Afterward, you must place the end cap with the lamp holder onto the splined duct flex connector. This assembly must then be framed with steel studs. Before placing the three light assemblies, make sure that they have cut-out holes for the duct caps in the ceiling. 


For a powder coating oven, mineral wool is the best material for insulation. The insulation must be placed in between every stud. Cut the insulation to fit the spaces with a sharp utility knife. When working with insulation, you must wear full safety gear such as gloves, safety goggles, and other equipment to protect you from the itchy effects of the insulation material.

Insulated panels are then installed on the four heating elements, the duct-work on the back of the oven, and the entire topside of the oven. These panels must be framed using steel studs and rivets. 

Heating Elements

Oven heating elements can range anywhere between 2,000 and 3,600 watts. In calculating your needed wattage, you must take note that you should have 100 to 150 watts worth of heating element for every cubic foot of interior oven space. If you are in a cold region, you should acquire an oven that is close to 150 watts per cubic foot.

A BTU calculator can also be used for measuring your needed heating element. Just enter the interior dimensions of your oven in inches, the average ambient temperature in your area, your desired temperature in Fahrenheit, and your predicted total heating element wattage. The calculator will then show you the time that it will take for your oven to reach your desired temperature. 

These elements are the primary components of a powder coating oven. If you want to know more details about building and designing a powder coating oven, contact us now at GP Industries.

GP Industries Pty Ltd

Head Office

1 Regal Court,
Vermont South VIC 3133

Phone: (03) 9802 1355

Fax: (03) 9802 6027

Email: gp_ind@bigpond.com


Factory G,
20 Burgess Road,
Bayswater North VIC 3153

Phone: (03) 9761 7676

Fax: (03) 9761 7671

Email: gpfactory@bigpond.com

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