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ABSORPTION UNIT - A self-contained, factory tested assembly <br />of component parts producing refrigeration for comfort cooling <br />by the application of heat. This definition shall apply to those <br />absorption units which also produce comfort heating. For the <br />purpose of this Code, absorption units are classified as follows: <br /> 1. Direct absorption unit - One in which the refrigerant <br /> evaporator is in direct contact with the air to be <br /> conditioned. <br /> 2. Indirect absorption unit - One in w~ch the refrigerant <br /> evaporation is not in direct contact with the air to be <br /> conditioned. <br /> <br /> AIR HANDLING UNIT - A blower or fan used for the purpose of <br />distributing conditioned air to a room, space or area. <br /> ADMINISTRATIVE AUTHORITY - The person or persons designated <br />as having jurisdiction. <br /> APPROVED BTU RATING - The listed maximum fuel-burning capacity <br />of any appliance, absorption unit, or burner expressed in British <br />Thermal Units input per hour. <br /> <br /> BLOWER-TYPE WARM AIR FURNACE - A warm air furnace equipped <br />with a fan which provides the primary means for circulation of <br />air through such furnace. <br /> BRAZED JOINT OR SEAM - Any joint or seam obtained by joining <br />of metal parts with alloys which melt at temperatures higher <br />than 1,000 degrees F., but lower than the melting temperature <br />of the parts to be joined. <br /> <br /> CIRCULATING AIR SUPPLY - Air being conveyed from a conditioned <br />area or from outside of the building through openings, ducts, <br />plenums, or concealed spaces to a heat exchanger of a comfort <br />heating, cooling, absorption, or evaporative cooling system. <br /> COMFORT COOLING - Air cooling to 50 degrees F. or above. <br /> <br /> COMFORT COOLING UNIT - A self-contained refrigerating system, <br />which has been factory-assembled and tested, installed with or <br />without conditioned air ducts and without connecting any <br />refrigerant containing parts. <br /> Note: This definition shall not include a portable comfort <br />cooling unit or an absorption unit. <br /> COMFORT HEATING EQUIPMENT - This definition shall include all <br />warm air furnaces, warm air heaters, combustion products vents, <br />comfort heating air distribution ducts and fans, all steam and <br />hot water piping together with all control devices and <br />accessories installed as part of, or in connection with, any <br />comfort heating system or appliance regulated by this Code. <br /> COMFORT HEATING SYSTEM - A warm air heating plant consisting <br />of a heat exchanger enclosed in a casing, from which the heated <br />air is dis~ributed through ducts to various rooms and areas. <br /> Note: This definition shall include the circulating air <br />supply and conditioned air supply and all necessary apparatus <br />and equipment installed in connection therewith. <br /> CONDITIONED AIR SUPPLY - Air being conveyed to a conditioned <br />area through ducts or plenums from a heat exchanger of a comfort <br />heating, cooling, absorption, or evaporative cooling system. <br />CONDITIONED AREA - An area, room or space normally occupied <br />and being heated, or cooled, for human comfort by any equipment. <br /> DUCT - Any pipe for the transmission of air for any heating, <br />ventilating, or comfort cooling equipment. <br /> Exception: This definition shall not include 1) a vent, a <br />vent connector, or a smoke pipe; 2) any pipe wherein the pressure <br />of the air exceeds one pound per square inch. <br /> <br /> DUCT SYSTEMS - Ail ducts, duct fillings, plenums and fans <br />assembled to form a continuous passageway for the transmission <br />of air: <br /> 1. Low Pressure - Systems operating not in excess of four <br /> inches water column pressure. <br /> 2. High Pressure - Systems operating in excess of four inches <br /> water column pressure. <br /> The above noted values are the pressures existing in the duct, <br />not the total pressure at the fan. <br /> <br />-24- <br /> <br /> <br />