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Figure 3: IDHE orientation
Airflow Switch: When furnished, ensure the airflow switch is plumbed appropriately for the given duct condition.
The pickup tube must be connected to the switch port labeled "LOW" if the duct is negatively pressurized and the
opposite port if positively pressurized.
Note: An airflow switch only proves that airflow exists (a differential in static pressure), not that the minimum air
velocities and proper air distribution for the duct heater exist.
Electric Duct Heaters
5
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