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 fresh air supply systems product brochure, and also check out our brochure on combi-tunnel ventilation.

Related Products

Fresh Air Inlets

For installation into either the wall or ceiling, Big Dutchman fresh air inlets are very versatile and supply fresh air for negative pressure ventilation in an optimum and non-centralized manner.

Fresh Air Chimneys

Big Dutchman fresh air chimneys can be used for negative and balanced pressure ventilation, distributing fresh air from the roof into the house.

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.

Get Started on Your Project

Over the course of 80 years we have designed, tested, developed, and refined egg production equipment to meet every imaginable need. Get in touch with our sales team to discuss your farm requirements today.