Mechanical Supplies

Volume Control Dampers

About

AEROVAC volume control dampers, models AV-11-GALF (galvanised) and AV-11-ALALF (aluminium), licensed to bear the AMCA seal with ratings tested to AMCA Publication 511. Opposed-blade and parallel-blade configurations with a quadrant handle and locking scale, opposed blades give better control authority, parallel blades throw the air to one side and are used to direct rather than to throttle.

Application

Fitted on every branch take-off and at each terminal connection so the commissioning engineer can proportionally balance the duct system to design airflows, a cost-effective choice for low to medium pressure and velocity commercial HVAC. Balancing at the damper rather than at the grille avoids the whistle that comes from throttling at the outlet face, and the locking quadrant keeps the setting after the ceiling is closed.

Standards & Reference 5 cited

AMCA 511
The certified ratings programme for air control devices: dampers and louvres carrying a verified rather than a claimed rating.
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.
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.
UL 181
Factory-made air ducts and air connectors: the listing a flexible or fabricated duct carries.