Why Negative Pressure Occurs
The greater the exhaust volume and the less make-up air, the stronger the negative pressure. It reduces hood capture, makes doors hard to open and can pull air and odors in from adjacent areas.
Ventilation solution
Kitchen Make-Up Air & Negative Pressure Solutions
When the exhaust system removes large volumes of air, kitchens can suffer negative pressure, difficult air intake, stuffiness and back-drafting. Xin Changfeng restores air balance by coordinating make-up air equipment with the exhaust system.
RequirementsSelectionManufacturing & SalesAfter-Sales
Selecting Make-Up Air Equipment
Water-cooled fresh air units add cooled fresh air while ventilating and cooling; multi-wing centrifugal fans and silent fresh air cabinets suit low-to-medium pressure and low-noise supply. Selection depends on make-up air volume, humidity and location.
Balancing Make-Up Air and Exhaust
Make-up air is usually estimated as a proportion of exhaust volume and zoned to match the exhaust layout, avoiding over-supply or short-circuiting so fresh air reaches the main work areas.
FAQ
Kitchen Make-Up Air & Negative Pressure FAQ
Make-up air is commonly estimated as a proportion of exhaust volume; the exact ratio depends on kitchen area, openings, exhaust zoning and negative pressure, so a fixed figure should not be assumed.
They suit most kitchens needing ventilation and cooling, but humidity, water quality and throw distance must be assessed; humidity-sensitive spaces need care.
Make-up air should be zoned to match exhaust and interlocked so it runs only when exhaust runs, avoiding wasted energy and imbalance.