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 of aluminium) so the barn is absolutely airtight;
• exact control of the inlet opening thanks to strong tension springs: stable air circulation all the way to the centre of the barn, uniform temperatures in the entire barn 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 cleaner can be used without any concern.

Main advantages

• ideal supply of fresh air with negative pressure ventilation;
• available in four different sizes and thus easy to adjust to the building requirements;
• the inlet is pulled closed to control the inlet opening: stable air circulation all the way to the centre of the barn, uniform temperatures in the entire barn;
• an air deflector ensures perfect air flow towards the ceiling;
• a manual advanced inlet control set closes individual inlets;
• the use of high-quality materials ensures a long service life of the inlets;
• a high-pressure cleaner can be used without any concern.

Protective net against birds

• This net stops birds and small animals from entering the barn through the inlet.

Air deflector

• With the air deflector, 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 net against birds

• 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.

Anti-wind cap

• The anti-wind/anti-weather cap is recommended especially for barns without eaves.

Light trap

• In combination with the anti-wind cap, the light trap reduces the incidence of light very well. The air flow rate is hardly affected.

Main advantages

• ideal supply of fresh air from the attic 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 barn is absolutely airtight;
• exact control of the inlet opening thanks to tension springs: stable air circulation all the way to the centre of the barn, uniform temperatures while heating requirements remain low;
• because the air “sticks” to the ceiling, the negative pressure required even for large throwing ranges is low;
• the use of high-quality materials ensures a long service life of the inlets;
• operation is practically maintenance-free;
• a high-pressure cleaner can be used without any concern.

This special fresh air unit consists of a standard CL 1200 wall inlet, a cowl and a small fan. It is mainly used in barns in which constant negative pressure ventilation cannot be guaranteed, generally smaller houses for free range egg production where using fresh air chimneys would not be practical.

The large pop holes make it impossible to create a stable air circulation in such barns. The fresh air is therefore pushed into the barn by a fan, i.e. the ventilation system works with balanced pressure. Usually, every third wall inlet is a CL 1200 Balance inlet.

Main advantages

• good ventilation of the barn thanks to the large throwing range, ideal to dry the litter;
• the mixed air creates a constant warm breeze;
• perfect for cold weather because the air flow always guarantees an ideal throwing range, irrespective of the ventilation level (mixed air);
• the fan ensures constant air movement – the CL 74 actuator controls the position of the butterfly valve and creates fresh air, mixed air or recirculated air as required (recommendation: individual control).

Main advantages

• supply of fresh air from the roof into the centre of the barn for an ideal mixing with the warm air in the barn;
• ideally suited for flat barns;
• good price : performance ratio.

Our MultiVent inlets are characterised by a very high air flow rate. They can be used as air inlets for tunnel ventilation or for additional summer ventilation. Air flow and air direction can be controlled easily. In the winter, the inlet flaps close reliably. The flaps are insulated so temperature losses are minimised.

Depending on the required dark-out strength, we can offer different types of light traps. The light trap segments are made of plastic, which makes them extremely durable and easy to clean. The Performacs light trap reduces the air flow rate by as little as 10 percent.

MultiVent and SOB 50 have the advantage of being very flexible. They also allow controlling the amount of incoming air very well, using our actuators CL 175 and EWA.

Our Big Dutchman tunnel door TD-L consists of either 40 mm or 50 mm thick composite boards with a robust plastic coating. The frame and the rack and pinion are made of corrosion-resistant aluminium.

With the EWA actuator, the tunnel doors can be opened and closed steplessly, allowing very exact distribution of the air. The flexible lip seal ensures tight closing with very little closing force. Total door lengths of up to 40 m are possible!

TD-L is available with heights of 750, 1000, 1200 and 1500 mm and for installation in brick walls or sandwich panels. The maximum opening angle (towards the inside or the outside) is 60 degrees.

Opening from the top
We recommend this system especially if the tunnel door should not open fully from the start. With this system, the cooler fresh air will enter the barn at the top first, without reaching the birds. There is no stress on the curtain thanks to the compensation mechanism of the telescopic coupling. Re-adjustments are not necessary.

Opening from the bottom
With this system, the roller tube is not loaded with weight thanks to the special winch motor. This guarantees a reliable winding process and thus preserves the fabric. Winding systems that open from the bottom are available with a fixed drive or a climbing drive. In case of very high curtains, this allows foregoing a long telescopic tube.

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

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