Testing shows that air needs to be allowed to circulate around the oven in three ways to get the best results. The tray has holes punched down either side of the tray allowing the heat from the element on the bottom of the oven to circulate to the top of the oven.

Similarly, the tongues on the front and the back ensure that the tray does not move inside the oven maximising the convection while providing a gripping point for safely and easily removing the tray from the oven.

 In designing the third way to increase circulation by keeping an air gap between the bottom of the tray and the bottom of the oven, we ensured that when the tray was inserted, the oven racks didn’t need to be taken out and stored elsewhere.

 When hung on the top rail in the oven, there is enough room for the two racks to be placed at the bottom of the oven.