Camel-back ovens are an extremely efficient design and especially useful for powder coating systems.  The description is applied to an elevated oven that permits loads to enter and leave through openings in the oven floor.

Main advantage, especially for powder coatings is that this entry arrangement does not require a powered airseal and therefore does not result in powder disturbance.

Another advantage is space saving, in the illustration, for example, the powder curing oven is located above the drying oven