Sail Switch (Air Pressure Switch)
$27.50
Avoid wiring your duct fan into you furnace with the sail switch
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wiring directly into your furnace could void a warranty or cause furnace failure
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the sail switch turns your inline duct fan on utilizing the air pressure from your main blower to engage the trigger on the switch
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the sail switch is installed in the branch duct between the main branch and the booster fan
