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			* Only used for HS-5 models prior to the UC1 change over date 9/02.
				| * Models prior to 1992 with sensing elbow near positive 
				discharge of housing must order PS1301 Positive Pressure Switch.
 ** Only used for HS-3 models prior to the UC1 change over date 
				9/02.
 * Only used for HS-4 models prior to the UC1 change over date 
				9/02 .
 
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