Abstract: A platen apparatus includes a housing having multiple vents; a turbine wheel rotatably attached to a rear section of the housing, the wheel having a circular body and a circumferential face without a coating thereon, the body includes vanes, each vane being a hole which extends through the body from one side to an opposing side of the wheel; a support belt engaged in tension about the circumferential face of the wheel; and the rear section of the housing is at least partially open so that a portion of the circumferential face of the wheel is exposed outside the housing. The vanes are arranged adjacent to the vents, and each provide a flow channel through which air is drawn in from a first side of the housing through the wheel body and released at a second, opposite side of the housing.