Balanced ventilation is the difference between a system that “moves air” and one that delivers comfort quietly. When supply and return airflow are out of sync, you may hear whistling at grilles, rumbling in ducts, or a constant fan roar—while rooms still feel stuffy. In Los Angeles, where windows often stay closed due to heat, wildfire smoke, or traffic pollution, proper balancing also supports better indoor air quality. Start with the basics: confirm that supply and return paths are adequate. Undersized returns or closed interior doors can create pressure imbalances that increase noise and reduce draft. Next, measure airflow at diffusers and returns, then adjust dampers to distribute air evenly rather than “choking” a few vents. Over-restricting a branch can raise static pressure, pushing the fan into a loud operating range. If noise persists, look for turbulence sources: sharp elbows, crushed flex duct, abrupt transitions, or grilles that are too small for the required CFM. Replacing restrictive registers, straightening duct runs, and using properly sized fittings can dramatically cut hiss and whistle. Add vibration isolation at the air handler, seal duct leaks to prevent high-velocity jets, and consider acoustic liner or duct silencers on problematic runs. Finally, verify fan speed and control settings. A well-balanced system often allows lower fan speeds without sacrificing airflow, reducing sound and energy use. The result is quiet, steady ventilation, healthier air, and consistent comfort throughout the space.
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