The Modine HD pressure switch will cut the heater off if there is not enough air pressure in the exhaust to vent the heater properly.
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Modine Part #
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Fits Modine Models
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5H75030-3
Replaces part # 5H75030-2
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HD30, HD45, HD60
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5H75030-4
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HD75
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5H79441-9
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HD100, HD125
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Item # 401, 4015250, 4015260, 4015265