Is there a minimum amount of snow for this to be used? ie: more then 3 inches..more than 6 inches?

Most machines work best and more efficiently with enough snow to fill the intake. Very shallow snow may be better removed with a shovel or broom first. For the best recommendation on which Ariens machine is right for your conditions, it’s a great idea to contact a local Ariens dealer. They can consider your typical snowfall, driveway/sidewalk size, surface type (gravel vs paved), and terrain — and match you with the model and features that will work best for your specific conditions. They can also demonstrate how the machines operate and let you feel the differences between models before you buy.