Outer and inner inflatable members and a motor assembly including a fan are disposed on a base member. Air provided under pressure by the motor assembly including the fan passes through vents in the base member to inflate the inflatable members. Flakes are disposed in the space between the inflatable members. One vent, larger than the others, provides for the flakes to be lifted upwardly from the base member by the pressurized air. At least another vent in the base member provides for a movement of the flakes by the pressurized air in an annular direction in the space between the inflatable members. A permeable cap disposed on the outer inflatable member limits the pressure in the outer and inner inflatable members to a particular value.