Fresh air supply systems

Main advantages

• ideal supply of fresh air with negative pressure ventilation;
• advanced inlet control creates stable air jets, especially with minimum ventilation;
• strong tension springs close the insulated and non-deformable inlet flap (integrated
• profile made from aluminium) so the building is absolutely airtight;
• the inlet opening is controlled precisely by strong tension springs: stable air circulation throughout the house, uniform temperatures in the entire house while heating requirements remain low;
• the use of high-quality materials ensures a long service life of the inlets;
• very versatile application;
• a high-pressure washer can be used without any concern.

 Protective grille against birds

• This pest guard prevents birds and small animals from entering the building through the inlet.

Air deflector

• With the air deflector (also available for the CL-3-1200 and CL-3-1900 series), the direction of the air flow can be adjusted individually for each 
  building, simply by changing the angle between deflector and wall.

Intake nozzle with protective grille against birds for CL-3-1911/F

• This nozzle significantly reduces the turbulence when the air flows into the inlet, thus ensuring more stable air jets, even with a small inlet 
  opening.

Fly protection

• To stop flies and other insects from entering the building, thus reducing the transmission of pathogens through incoming fresh air, Big Dutchman offers a fine-meshed fly screen for the CL 1200 inlet series.

Main advantages

• ideal supply of fresh air from the roof space with negative pressure ventilation;
• very versatile;
• advanced inlet control creates stable air jets, especially with minimum ventilation;
• strong tension springs close the insulated inlet flap so the building is airtight;
• the inlet opening is controlled precisely by tension springs: stable air circulation throughout the house, uniform temperatures while heating requirements remain low;
• fresh air remains at ceiling height for longer: a lower negative pressure is sufficient to ventilate the house efficiently;
• the use of high-quality materials ensures a long service life of the inlets;
• operation is virtually maintenance-free;
• a high-pressure washer can be used without any concern.

CombiDiffuse ventilation is a combination of two ventilation systems. With low outside temperatures, fresh air is supplied through the DiffAir ceiling. The fresh air enters throughout the entire ceiling, evenly and at a low speed.

With high outside temperatures, the ceiling inlets are automatically opened by the 307pro or 310pro climate computer. This effect causes the air to enter the building at a much higher speed. The animals then feel more comfortable with the perceived lower temperatures created by higher air speeds.

The DiffAir ceiling serves both as a diffused fresh air supply system and economical ceiling insulation. It consists of glass-reinforced plastic (GRP) trapezoidal or aluminium sheets. Aluminium sheets have the advantage of being incombustible. DiffAir ceilings are installed at a height of 2.40 m to 3 m.

Their insulation consists of specially treated glass wool. Two layers of the glass wool are provided, permeable to air flow. An additional layer of fleece between the glass wool and the DiffAir plate acts as a water repellent.

F.A.C. 2 consists of a stable pipe system that is GRP coated on the inside and the outside. The pipes are well insulated with 30 mm of polyurethane. F.A.C. 2 is easy to clean, has a long service life and is available in four diameters (650 mm, 730 mm, 820 mm and 920 mm).

The fresh air distributor at the lower end of the chimney ensures that the incoming air is distributed evenly inside the house. This creates a stable air flow even with minimum ventilation. F.A.C. 2 is available with central or individual control.

For individual control, the CL 175 actuator is installed directly at the chimney. Central control of multiple chimneys requires a single actuator plus cables and tension rods.

The MultiVent inlets are characterised by a very large open area. They can be used as air inlets for tunnel ventilation or for additional summer ventilation. Air flow and air direction can be controlled easily.

During colder periods, the inlet flaps close reliably. The flaps are insulated so temperature losses are minimised. For warmer regions, a noninsulated version of the inlet flap is also available.

MultiVent and SOB 50 have the advantage of being very flexible. They use Big Dutchman actuators, which enable good control over the volume of incoming air.

While each of the motor-driven SOB 50 shutters has its own small actuator, the amount of air entering through the MultiVent inlets is controlled by a central CL 175 or EWA actuator.

Using drop curtains is a simple but very effective method for controlling the natural air exchange in pig housing. The Big Dutchman EWA actuator automatically opens and closes the curtains.

Roller curtains are a well-proven closing system. Due to the winding mechanism, the curtain is perfectly protected when fully retracted: there is no room for rodents, the curtain stays clean and its service life extends.

With lower temperatures in the mornings and to prevent draughts, especially, curtains should always open from the top to the bottom. The cooler fresh air will enter the house at the top first, without reaching the pigs.

A specifically designed telescopic coupling with compensation mechanism ensures no stress is placed on the curtain. Re-adjustments are not necessary.

Actuators of a high quality are absolutely necessary for reliable fresh air distribution. They control the flap position of any fresh air inlets, whether these are wall or ceiling inlets, fresh air chimneys, tunnel doors or roller curtains.

Essential requirements such as functional reliability and robustness are delivered by the CL 175 and EWA actuators offered by Big Dutchman.