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Apprentice answer

Should a VAV box be hung independently of the ductwork

2nd YearVAVs, Fan Coils & Equipment ConnectionsCheck first

Yes, always. A VAV box contains a motorized damper, an electrical heater coil (often), and an actuator. It is too heavy to let dangle off sheet metal joints. * It must be supported independently using its own dedicated all-thread rods, strapping, or a unistrut trapeze anchored directly to the building deck.

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Plain-English answer

Yes, always. A VAV box contains a motorized damper, an electrical heater coil (often), and an actuator. It is too heavy to let dangle off sheet metal joints. * It must be supported independently using its own dedicated all-thread rods, strapping, or a unistrut trapeze anchored directly to the building deck.

Field checklist

Ask Foreman

Hey boss, I’m checking vavs & fan coils: Should a VAV box be hung independently of the ductwork? 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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