Rectifier Technology

All Biddle air curtains (SR, DoorFlow, CITY, Style and MAT) are equipped with the patented rectifier technology. This results in the following advantages: 

• Significant climate separation efficiency (90%)
• Excellent downward penetration
• Laminar air flow  
• Air curtain warmth benefits the indoor climate 
  
  

Without rectifier: large air displacement	With rectifier: perfect climate separation

High yield
Because of the difference in temperature between inside and outside areas, air always moves in the vicinity of an open door: warm air streams in and cold air streams out. The patented rectifier ensures that the air turbulence caused by the fans is transformed into a laminar air stream. The air stream reaches the floor at a much lower air speed than air curtains without the rectifier. The tight air stream prevents cold air from streaming out. This achieves a climate separation efficiency of over 90%.