Nordyne/Miller/Intertherm Pressure Switch (1.0in PR) (FM-632452) (NOT RETURNABLE)
$34.95
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1.0" PR. A pressure switch is also referred to as a combustion air switch or a draft proving switch. The switch closes when the combustion/booster motor runs creating a negative air pressure. This model replaces 632390. M3RL 80,000 BTU Furnace.
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