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Mistake & recovery · #045

Calling a diffuser a register and a register a grille (wrong terminology with the GC)

1st YearSystems & Controls

Diffuser = supply outlet with air pattern control. Register = supply or return with a damper. Grille = return or transfer opening, no damper. Use the corr…

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Safer field move

Diffuser = supply outlet with air pattern control. Register = supply or return with a damper. Grille = return or transfer opening, no damper. Use the correct term every time — it matters on RFIs and submittals.

Ask Foreman

Can you verify this before I keep going? I’m looking at: Calling a diffuser a register and a register a grille (wrong terminology with the GC). What’s the approved correction for this job?

Do not

Do not hide, force, cover, or “make it work” if this affects safety, access, airflow, rated assemblies, supports, equipment, or inspection. Stop and verify the approved correction.

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