Fan speed in the air oven were at 1
meter per second. The volume in which each drying
was conducted was 330 mm × 450 mm × 300 mm in
size and consisted of a rotating glass plate with a 240
mm diameter at the base of the oven. For about 5 min
the glass plate rotated at 360° in which the rotation
could be changed by pressing the on/off button.
Time adjustment was done with the aid of a digital
clock.