When a smoke extraction system fails to draw properly, it is common to assume the motor lacks power. However, in the majority of cases, the real issue lies not within the motor itself, but in the design and installation of the extraction ductwork.
A duct that is too narrow, excessively long, or fitted with too many elbows can restrict airflow to the point of preventing the motor from performing as intended. At Decomant Group Andorra, specialists in extraction systems and rope access, we explain why duct diameter and motor power must always be perfectly balanced.
Duct diameter: the single most critical factor influencing system performance.
The diameter of the extraction duct is critical for seamless airflow; when the duct is undersized, the motor overworks, noise levels increase, suction capacity drops, and the extractor's lifespan is significantly shortened. Conversely, a correctly sized installation maintains optimal airflow and guarantees efficient extraction for kitchens, commercial premises, hospitality businesses, and smoke evacuation systems.
Reducers, elbows, and long duct runs: the enemies of efficiency
Many installations suffer from common errors such as unnecessary reducers, abrupt diameter changes, excessive elbows, and overly long runs. Each of these elements causes pressure drops and undermines motor capacity, leading to increased noise, vibrations, smoke or odor backdrafts, and premature wear that results in costly breakdowns. Ultimately, optimizing the duct layout is just as critical as selecting a high-quality motor.
A powerful motor is useless if the ductwork can’t keep up
Installing a high-power motor does not guarantee performance if the ductwork restricts sufficient airflow.
The outcome is always the same: an underperforming extractor and a strained motor.
The key lies in ensuring that the motor and ductwork are sized in tandem, eliminating reducers and bends that obstruct the airflow.
Trust the experience of Decomant
At Decomant, we inspect both the motor and the entire ductwork installation, performing interventions on both interiors and exteriors through advanced rope access techniques. If your extraction system is noisy, lacks suction, or you suspect the ducting is undersized, we can enhance your system's performance with a precise intervention. Contact us today for more information.
