Large Air Inlets

Fresh air supply over a large surface

Tunnel ventilation requires large openings in the end or close to the end of the poultry house. The exhaust fans are located at the opposite end of the house. Air is drawn through the openings, down the house, and out the fans, like a wind tunnel. This form of ventilation is popular in hot climates to provide additional summer ventilation, quickly removing heat and excess moisture. A smooth high air speed at bird level of 2 to 3 m/s lowers the temperature perceived by the birds (wind-chill factor). In winter or when tunnel ventilation is not required, the large insulated inlet flaps close reliably to prevent temperature loss.

Important Advantages

  • Allows fresh air to enter the house on a large surface
  • Displaces stale air without mixing with it
  • Provides an even and high air speed at bird level
  • Temperature loss is prevented by insulation of the flaps
  • Best suited for tunnel ventilation

MultiVent 17M

With its large air performance, the MultiVent 17M can be used for additional summer ventilation or as an inlet for tunnel ventilation. Air flow and air direction can be controlled easily.

PerforMacs Light Trap

The PerforMacs light trap (for all MultiVent types) has been designed for optimum aerodynamics, reducing air performance by no more than 10% percent. The light trap segments are made of plastic which makes them extremely durable and easy to clean.

TD-L Tunnel Door

These large tunnel openings have a modular design. The length of the door opening is customized for each barn based on tunnel length and required ventilation capacity.

  • Strong door with high degree of insulation
  • The aluminum frame and enhanced rubber sealing lip guarantee airtight closing of the door
  • With Big Dutchman CombiTunnel ventilation, the smooth, continuous control of the tunnel doors permit the a lower number of fresh air inlets
  • High quality system components ensure low maintenance

CombiTunnel Ventilation

Big Dutchman’s CombiTunnel ventilation is a strategic combination of wall inlets and tunnel doors. This ensures steady control of climate and environmental conditions for your birds. CombiTunnel ventilation works best in regions that have large fluctuations in temperature (hot humid summers and cool winters).

Side mode uses wall inlets during cooler weather, while tunnel mode kicks in during hot sticky periods. You can control both systems with ViperTouch, which automatically switches between the two ventilation systems as needed.


View and download the latest product brochures for fresh air supply systems and CombiTunnel ventilation.

Related Products

Fresh Air Inlets

Big Dutchman fresh air inlets are designed for efficient circulation and ventilation within poultry houses.

AirMaster Fans

AirMaster fans are the next generation of poultry house fans. They have a unique combination of characteristics that provide significant advantages for customers in terms of profitability in climate control – including high air performance, minimum energy consumption, optimized aerodynamic design and resistance against corrosion.


ViperTouch controls and manages all functions of your broiler, broiler breeder or turkey production such as ventilation, feeding, watering, lighting, egg counting, all weighing and even visual controls – providing you the best possible overview and convenient production management.

Let a Local Distributor Advise You

Big Dutchman has a large network of trusted poultry distributors who are ready to work with you on your project. To get started, locate a distributor near you.