In the past, range hood setups were mainly constructed with minimum airflow rates stipulated by regulations, which were dependent on the hood's reservoir size. This design methodology resulted in heightened exhaust airflow as range hoods grew in length and depth, causing significant amounts of air to be expelled through the system.
Presently, engineered range hood systems are designed to conform to UL-certified or calculated airflow norms, customized to the particular appliances being utilized. This progression has led to a decrease in the airflow requirements of contemporary range hood systems.
Some producers offer energy-efficient range hoods that generally function at 30% less cubic feet per minute (CFM) in comparison to traditional models.
Improvements in range hood filter efficiency have also contributed to heightened static pressure and the potential for noise generation. The adoption of an energy-efficient grease filter can markedly enhance grease collection at the range hood level. Nonetheless, excessive exhaust rates can lead to increased noise criteria (NC) levels within the kitchen. Certain producers have engineered range hoods designed to sustain 40-50 NC levels, employing patented grease filters.
Nowadays, Demand Control Ventilation (DCV) systems are becoming more common in kitchen designs. These systems adaptively regulate exhaust airflow based on cooking activity, consequently diminishing associated noise levels. While basic DCV (temperature-only systems) can reduce airflow by 20%, more advanced systems can achieve reductions of up to 70%. These reductions take place when only a handful of appliances are operational, a frequent occurrence during daily commercial kitchen preparations, offering a quieter environment that promotes superior communication and diminishes stress.
If your range hood is producing excessive noise, several factors may be responsible:
Fan Selection – Ensure the fan is correctly sized for the range hood system. A fan with excessively high RPM or an undersized unit can lead to noticeably higher noise levels.
Ductwork – Vibrations in the ductwork can transmit noise to the range hood in the kitchen. Additionally, the air velocity within the ducts should ideally remain below 1800 feet per minute under normal airflow conditions.
Fan Belt Condition – Examine the fan belt for wear, slipping, or damage. A deteriorated or misaligned belt can reduce efficiency and introduce additional noise.
Fan Wheel Balance and Condition – Confirm that the fan wheel is properly balanced and free of damage. An unbalanced, dirty, or bent wheel can cause noise, particularly if it contacts the surrounding housing.
Routine Cleaning – Keep the fan clean by removing accumulated grease, dirt, and debris. Buildup on the blades can disturb airflow and amplify noise.
Vibration Isolators – These components help minimize noise transmission by absorbing vibrations. Neoprene mounts or spring isolators act as dampeners, reducing structural vibrations.
Grease Filters – Maintain grease filters as instructed by the manufacturer. Clogged filters can impair airflow efficiency and contribute to noise.
Correct Filter Installation – Check that grease filters are properly seated in the range hood. Improper installation may disrupt airflow and increase noise.
Addressing these factors should help reduce noise from your range hood system. If the problem continues, consulting a professional with expertise in kitchen ventilation systems may be required for an accurate diagnosis and solution.
Additionally, keep in mind that other noise sources in a commercial kitchen—such as cooking activities, dishwashers, and kitchen appliances—can also contribute to overall noise levels. 
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