* 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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* Only used for HS-5 models prior to the UC1 change over date 9/02.
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