Mechanical Supplies
Diffuser
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About
- Square, round and perforated face ceiling diffusers with fixed or adjustable cones, giving a horizontal or vertical discharge pattern. Neck size is selected on throw and noise criterion rather than on the duct size that happens to be available.
Application
The default supply outlet in false ceilings across offices, retail, hospitality and healthcare. The horizontal pattern uses the Coanda effect to hold the jet against the ceiling until it has mixed with room air, which is why a diffuser mounted too close to a bulkhead, or fed by a squashed flexible duct, dumps cold air onto the people below it.
Standards & Reference 5 cited
ASHRAE 70
The method of testing air outlets and inlets: how the performance data for a grille or diffuser is produced.
EN 12238
Aerodynamic testing of air terminal devices for mixed-flow applications: the data behind a diffuser's selection tables.
EN ISO 5219
Laboratory aerodynamic testing of air terminal devices: how a diffuser or grille's throw and pressure drop are established.
AMCA 500-D
The laboratory method for testing dampers: air performance and, critically, leakage. Leakage class is what a smoke control or energy calculation depends on.
Also citedASHRAE 113
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