Diffuser Face Size vs Neck Size
Diffusers have a neck size (duct connection) and face size (visible ceiling dimension). Confusing them causes ordering errors.
What You Might Be Looking At
ceiling diffuser with visible face and hidden neck connection to duct
Apprentice words: diffuser size, ceiling vent size, register size, grille size
Trade terms: diffuser neck size, diffuser face size, register neck, grille face
Check First
What Not To Do
Don't assume diffuser size refers to face. Don't order without checking if spec means neck or face.
What can go wrong: Wrong diffuser ordered, doesn't fit ceiling, boot mismatch, schedule delay from re-order
Better Foreman Question
Does the drawing specify diffuser neck size or face size? And which does the boot need to match?
Verify With
Reference type: project specs, manufacturer data
Source to verify: Diffuser manufacturer catalog, project reflected ceiling plan
Safe wording: Diffuser sizing conventions vary by manufacturer.