Commercial kitchens require effective exhaust to remove heat, moisture, grease, and cooking emissions. Without a coordinated make-up air strategy, this can lead to excessive negative pressure, backdraft, draught discomfort, and reduced hood capture efficiency.
Make-up air is therefore a key part of stable kitchen ventilation. Delivered evenly and at low velocity, it helps maintain supply and exhaust balance, reduce airflow disturbances around hoods and ventilated ceilings, and improve working conditions in the kitchen.
How make-up air strategy supports system stability?
- In commercial kitchen ventilation, uncontrolled cross-draughts can weaken the capture and containment performance of hoods and ventilated ceilings. Low-velocity make-up air supplies air in a stable, controlled way, reducing the influence of external airflow and pressure-driven movement on the exhaust area. When coordinated with the exhaust system, it can also help optimize required airflow rates.
- Unlike direct high-velocity supply air, low-velocity make-up air units are designed to deliver air evenly with minimal turbulence. This reduces the impact on the cooking area and exhaust capture zone. Combined with Halton Capture Jet™ hoods or ventilated ceilings, they help support stable airflow patterns and improved system energy efficiency.
- Stable make-up air also supports better indoor air quality and thermal comfort. By reducing stuffiness and poorly organized airflow, it helps create a more comfortable working environment for kitchen staff operating in hot, humid and high-load conditions.
Selecting the right make-up air approach for different kitchen environments.
- Low-velocity mixing make-up air: reducing disturbance in the exhaust capture zone
Low-velocity mixing make-up air supplies fresh air evenly and gently into the kitchen, allowing it to mix gradually with room air. This helps prevent high-velocity jets from disturbing the thermal plume or the upward path of cooking emissions. In kitchens with exhaust hoods or ventilated ceilings, it supports stable capture and containment performance.
- Displacement make-up air: improving air quality and comfort in the occupied zone
Displacement make-up air prioritizes air quality and thermal comfort in the occupied zone. Clean fresh air is supplied at low velocity to staff areas, while heat sources help carry heat, moisture and contaminants upward to the exhaust zone. This approach is especially useful in kitchens with high heat loads, high humidity or long staff occupancy.
- Construction and maintenance: choosing the right configuration for the air supply method and kitchen conditions
Whether using low-velocity mixing or displacement make-up air, equipment must withstand the high temperature, humidity, grease and frequent cleaning typical of commercial kitchens. Cleanable materials, accessible structures, suitable installation positions, correct dimensions and appropriate surface finishes all affect long-term performance. The final configuration should reflect the kitchen layout, cooking load, exhaust concept, staff movement and maintenance needs.
For commercial kitchens, make-up air is not simply an add-on to exhaust. It affects airflow balance, capture efficiency, staff comfort and energy performance. Whether based on low-velocity mixing or displacement air supply, the goal is the same: to bring air into the kitchen in a stable, controlled and low-turbulence way. Designed together with hoods, ventilation ceilings and the overall exhaust system, Halton make-up air solutions help support efficient ventilation, comfortable working conditions and long-term operational reliability.
