yes, but there are older off brands with out a heater , and others without fans !
supposedly convection is supposed to help with the dehydrating ...
like everyone else said, asl ong as theres a element that heats and a fan , youre set,
test it with apples, slice and dip in lemon juice, to prevent browning time till leathery, and time till crisp dry
then you have a base line, most foods take at least a day to dry, so you might as well fill all the trays, i ALWAYS rotate trays on any dehydrator, american harvest ones are great too ! ronco works pretty good
i wish i had a dehydrator , i would have made persimmon leathers , instead of freezing it all....
wonder how paw paws would dry out .....
hmmm... now you got me thinking again
right now all im using is a solar dehydrator , and its been rainy, so i cant dry food right now ....