Abstract: A chin support adapted to be used on a patient undergoing a prolonged dental procedure. The chin support consists of a bib which is draped around a frontal area of a patient. The bib is made of a relatively stiff material and has two vertical slots therein. A clamping mechanism is located in each of the slots and each has an upstanding rod attached to it. Each of the upstanding rods is attached to a chin support. When a predetermined position has been reached with the chin support with respect to an open jaw of the patient, each of the clamping mechanisms is tightened to keep the chin support in an adjusted position to enhance and maintain the comfort of the patient.

Abstract: A displacement ventilation system is located above a floor having an air plenum below the floor but above the concrete slab. A displacement ventilation workstation structure is located above the floor and thereby above the air plenum. An air fan is located below the floor and delivers air into flexible air ducts and from there into rigid upstanding air ducts. From there the conditioned air is delivered into rigid upstanding air ducts structure that is located under a workstation surface and has a front outlet that is controllable by a person sitting at the workstation. The upstanding duct has a lateral air opening or outlet which is opposite the direction of where air is delivered to the duct structure under the surface of the workstation. The outlet opening supplies the majority of conditioned air and is thereby delivered into the atmosphere of the work space at a very low velocity and at a point which is below the work surface of the workstation.

Abstract: A personalized air conditioning/displacement ventilation system is located above a floor having an air plenum below the floor but above the concrete slab. A displacement ventilation stand-alone air chamber is located above the floor and thereby delivers air above the air plenum. The air chamber has a frontal outlet and a lateral air outlet into the ambient atmosphere. Within the stand-alone chamber the air is being displaced in various amounts to various outlets. The stand-alone unit can be placed wherever it is needed or desired in many locations in a wide open work place as a retrofit.

Abstract: The combination with an air conditioning system including compressor, condenser and evaporator, with a humidifier for humidifying conditioned air and a heat exchanger for transferring heat between hot refrigerant of the air conditioning system and water supplied to the humidifier.