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Apprentice answer

How do I determine the "right" and "left" hand side of a VAV box

2nd YearVAVs, Fan Coils & Equipment ConnectionsCheck first

Stand at the inlet of the VAV box looking in the direction of the airflow (looking down line). * Whichever side the control enclosure, DDC controller, and actuator motor are mounted on determines if it is a right-hand or left-hand box.

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Plain-English answer

Stand at the inlet of the VAV box looking in the direction of the airflow (looking down line). * Whichever side the control enclosure, DDC controller, and actuator motor are mounted on determines if it is a right-hand or left-hand box.

Field Warning: Missing this on a layout means your control panel might end up jammed blindly against a concrete wall or structural beam, failing inspection immediately.

Field checklist

Ask Foreman

Hey boss, I’m checking vavs & fan coils: How do I determine the "right" and "left" hand side of a VAV box? I found the likely issue and want to verify the next step before I lock it in. Do you want me to adjust it now or check the drawing/detail first?

Verify before acting

Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

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