How many type of heating method of the curing oven?

Powder coating curing is the final step in the paint process, the cure oven raises the products and coated material to a specified temperature and holds this temperature for a set time. Typically, 20-30 mins at a set temperature is need to achieve a minimum curing for 20 minutes. 

There are two types heating method.

Direct heating: like electric oven,powerd by heating pipe, and infrared powerd oven, by infrared burners.

Indirect heating: like Gas powered oven and LPG/DIESEL powered oven, generally will install a combustion chamber, the advantage of this one is make the oven inner more clean and the heating more well-distributed, longer time operation life time.

Choose which one all depends on your situation just at that moment.