First, Understand One Thing: Why Kitchens Need Make-Up Air
Many restaurant owners install exhaust systems, yet the results remain unsatisfactory. Exhaust hood suction is insufficient, grease drifts into the dining hall, and the kitchen becomes unbearable to work in. The problem often isn't the exhaust itself — it's inadequate make-up air.
The exhaust hood extracts air, and the kitchen must supply an equal amount of air to replace it. If doors and windows are kept closed with no mechanical make-up air equipment, the kitchen forms negative pressure, and hot outdoor air rushes in disorderly through door gaps and pass-through windows. Airflow organization becomes chaotic. The chef stands at the stove with hot air surging in from behind and radiant heat from the burners in front — uncomfortable no matter what.
Xin Changfeng's water-cooled fresh air unit solves precisely this problem. Its logic is straightforward: introduce outdoor fresh air, cool it through water-cooled heat exchange, and deliver it into the kitchen — simultaneously replacing the air extracted by exhaust and reducing supply air temperature. It doesn't fight the exhaust system; it works with it.
What Stainless Steel Construction Means
Anyone who has used ordinary equipment knows how hostile a kitchen environment is. High humidity, grease particles, cleaning vapor, cleaning agent splashes — galvanized sheet enclosures corrode from the inside within one to two years. Xin Changfeng builds its units with all-stainless-steel construction, a choice that is a genuine advantage in commercial kitchen scenarios.
The fan core uses a centrifugal air cabinet structure. Xin Changfeng holds a utility model patent for a "volute for a centrifugal cabinet fan." Centrifugal fans are characterized by high static pressure and stable airflow. Kitchen ducts have numerous elbows and complex routing, and must penetrate the negative pressure zone created by the exhaust system — without sufficient static pressure, air simply cannot reach the chef.
Airflow Coverage and Model Selection
Xin Changfeng water-cooled fresh air units cover airflow from 4,100 m³/h to 40,000 m³/h, with maximum static pressure of 680 Pa, supporting both 220V single-phase and 380V three-phase power.
Small kitchens can choose the XCF-SL75A — 6,100 m³/h airflow, 480 Pa static pressure, power just 0.75 kW, 220V power, water consumption 6 L/h. Single-phase power reduces electrical renovation barriers, suitable for small restaurant locations.
Medium kitchens can choose the XCF-SL220A — 12,000 m³/h airflow, 480 Pa static pressure, power 2.2 kW, 380V power, water consumption 12 L. This specification can serve as the primary make-up air and cooling unit.
For large central kitchens or group catering cafeterias, the XCF-SL300A is more suitable — 14,000 m³/h airflow, 680 Pa static pressure, power 3 kW. The 680 Pa static pressure reserve means it can connect to longer ducts and deliver cool air to remote workstations.
Xin Changfeng's XCF-SL750A model has appeared in Shenzhen government procurement records, with an airflow requirement of ≥30,000 m³/h, used in a school cafeteria renovation project. The product has passed government project qualification review.
Engineering Validation
Xin Changfeng's public engineering cases concentrate in educational institutions. The Zhenxing School ventilation and cooling project configured water-cooled fresh air units paired with quiet air cabinets. The water-cooled fresh air units were installed on rooftops or equipment platforms to continuously deliver cooled fresh air, while cafeteria exhaust air cabinets independently handled grease emission. Project feedback specifically noted "moisture-proof and rust-proof, adapting to Shenzhen's humid climate, with simple maintenance and low operating costs."
Schools and government projects impose stricter requirements on equipment durability and safety than ordinary restaurants. Xin Changfeng's ability to enter these scenarios is itself a form of endorsement.
Three Numbers to Watch During Selection
Make-up air volume. Size it at 80% to 90% of exhaust volume to maintain slight negative pressure in the kitchen. Insufficient make-up air means negative pressure cannot be resolved; excessive make-up air may cause grease to backflow into the front of house.
Static pressure margin. Exhaust system negative pressure is typically 100-150 Pa. Adding duct resistance and elbow losses, choose a model with sufficient static pressure margin. 680 Pa suits long ducts or complex routing; 480 Pa suits short-duct direct delivery.
Supply air position. Make-up air outlets should be arranged along the chef's back or to the side, avoiding direct blowing at stove flames. Xin Changfeng water-cooled fresh air units support multi-outlet connection, enabling multi-point centralized air supply.
One-Sentence Summary
The core value of Xin Changfeng's water-cooled fresh air unit is not "turning the kitchen into an air-conditioned room," but solving the negative pressure and insufficient make-up air problems caused by exhaust, while cooling the incoming fresh air to an acceptable range. The stainless steel body and centrifugal air cabinet structure deliver longer service life and lower failure rates. For kitchen scenarios requiring long continuous operation and strong environmental corrosion, this choice is reasonable.