When a ventilation system is noisy, the problem is often not the equipment itself, but an airflow imbalance. Too much air pushed through a few branches increases air velocity, causes diffuser “whistle,” makes ducts vibrate, and can even create rumbling at bends and grilles. At the same time, rooms farther from the fan may feel stuffy because they receive too little supply or exhaust. Proper balancing solves both issues: it delivers the right airflow to each space while lowering sound levels. Start with the basics: confirm that filters are clean, coils and grilles are not blocked, and flexible duct runs are not kinked. Restrictions force the fan to work harder and raise noise. Next, measure airflow at key points (diffusers, grilles, and main trunks) and compare it with the design targets. Adjust balancing dampers gradually, working from the closest branches outward so you don’t over-throttle the system. If a diffuser is loud, reduce its throw by balancing upstream rather than closing the face completely. Fan speed and static pressure are critical. Many noisy systems run at higher pressure than necessary. After branch balancing, lower fan speed (or adjust a VFD/ECM setting) to reach the minimum pressure that still meets required airflow. This often yields the biggest noise reduction. For persistent sound, address transmission: add duct liners or silencers, use proper connectors to reduce vibration, and ensure ducts are supported to prevent rattling. In Oxnard, where homes may be tightened for energy efficiency, balanced ventilation also improves indoor air quality by maintaining steady fresh-air exchange without drafts or annoying hum. The result is quiet comfort, consistent тяга (air pull), and healthier air throughout the building.
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