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AAON, inc. AAON Coil     Products, Inc. Acutherm Danfoss Graham Delta Cooling     Towers, Inc. FHP Manufacturing

Polaris RenewAire RSI Shelley Radiant     Ceiling Company United CoolAir Vapac Warren Williams

Polaris manufactures: Plate and frame heat exchangers Brazed plate exchangers Semi-welded plate heat exchangers Safety-pair double-wall heat exchangers