Mechanical Supplies
Registers & grilles
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- Extruded aluminium supply, return and door grilles with single or double deflection blades, MetalAire's Series 4000 is the reference pattern, with an extruded aluminium border and aerodynamically shaped, individually adjustable deflector blades on 0.666" centres. Opposed blade dampers are added in steel (Model OBD) or aluminium (Model OBDA) to make a register, and Series 4000R and 4000RS keep a uniform face appearance across supply and return.
Application
The standard sidewall and high-level outlet in offices, corridors, hotel rooms and villas, and the usual return air path in a ducted return or a ceiling plenum. Double-deflection is specified for supply so the horizontal and vertical pattern can both be trimmed on site
single-deflection is enough for return, where throw does not matter and the extra blade set is only cost.
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.
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.
EN 12238
Aerodynamic testing of air terminal devices for mixed-flow applications: the data behind a diffuser's selection tables.
SMACNA HVAC Duct Construction Standards
The North American reference for how ductwork is built: gauge, reinforcement and sealing against pressure class. What a duct submittal is checked against.
Also citedEN 12239
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