Keep the cold air in, keep the warm air out .
How it works .
A cold room air curtain projects a high-velocity, controlled jet of air downward across the open doorway. That jet forms an invisible aerodynamic barrier between the cold room and the warmer outside space — significantly reducing the exchange of cold, dry air outwards and warm, humid air inwards, while letting people, trolleys and pallet trucks pass through without obstruction.
Open door — no air curtain. Cold dense air falls out at floor level, warm humid air rushes in at the top. A continuous, self-reinforcing exchange (the “stack effect”) costs energy every second the door is open.
Open door — with air curtain. A high-velocity downward jet creates an aerodynamic seal. Cold air stays in, warm air stays out, but the doorway remains physically clear for staff and trolleys.
In cold chain applications the unit is normally ambient (non-heated) — the goal is climate separation, not warming the doorway.
Why velocity matters .
Energy saving
Reduced ice & frost build-up
The jet must reach the floor with enough velocity to resist the pressure differential across the door. Underpowered units fail at exactly the point they are needed most. Premium cold store units use high-static-pressure fans and adjustable discharge nozzles to keep jet integrity even in busy traffic.
Product protection
Unrestricted access
✕
✓
Too weak — cold air leaks at floor level.
Correctly specified — full-height jet, intact
Made with FlippingBook - PDF hosting