DACS A/S is a family-owned company with 30 years experience of developing, producing and delivering ventilation and control systems for livestock production. We have used our comprehensive knowledge about livestock production in the development of new products ensuring our customers the best ventilation solutions on the market. Our focus is on optimum animal welfare and on maximum energy efficiency.

Company details

Falkevej 18 , Nr. Snede , 8766 Denmark

Locations Served

Business Type:
Industry Type:
Agriculture - Livestock
Market Focus:
Globally (various continents)

DACS - world-class ventilation and control systems

With strict focus on energy efficiency, aerodynamics and animal welfare DACS has succeeded in making some of the world’s best ventilation systems for livestock. The most recent product from DACS, the award-winning wall fan MagFan, offers energy savings upwards of 70 % against any other high-end wall fan on the market. DACS’ ventilation solutions simply are the most energy efficient on the market and move more air at a lower energy consumption than any other system.

DACS develops, produces and delivers systems for climate and production control in livestock production. Our product development is based on more than 30 years of experience from the field and on cooperation with both universities and technological institutes. We put great emphasis on continuous development, and we constantly work to optimize our products on all parameters. Our prime focus is on energy efficiency. DACS’ ventilation systems are produced on the basis of a very substantial knowledge of aerodynamics. In a research project in collaboration with Aarhus University we have tested all our fans using the best testing equipment on the market.

More air using less energy

DACS’ ventilation systems are without comparison the most energy efficient on the market. We move more air using 25 to 50 % less energy than any other known ventilation system. And we can prove it! Using the best equipment, we see a close correlation between the environment in the barn, animal welfare and profitable production.

All DACS ventilation units have been tested in our own wind tunnel in a research project in collaboration with two Danish universities and the Danish Technological Institute. Ventilation solutions from other leading suppliers have been tested as well, and the results are documented in black and white.

The DACS patented ventilation systems for livestock production offer unique yet simple features that combine maximum animal well-being with profitable production. The Corona air inlet is the only ventilation unit on the market that utilizes the warm air in the roof space and mixes it with incoming air. The temperate air leaving the Corona air inlet is distributed evenly in the house. The constant movement of air removes gaseous waste and helps to keep the litter dry.

All our products are produced in materials that are suited for the harsh environment in livestock production: plastic and stainless steel. We design the products to be stacked very compact meaning that we save as much as 80 % on transportation compared to our competitors in the business.                                                                       

The world’s most energy efficient wall fan

DACS’ most recent product, the wall fan, MagFan, quite simply is the most efficient wall fan on the world market. In a direct comparison against leading suppliers, MagFan offers minimum 70 % lower energy consumption at equivalent flow rates, and it generally provides a higher maximum flow rate than all other fans of equivalent size.

MagFan presents an unprecedented combination of high capacity and extreme efficiency. The unit completely changes the perception of a fan. Its stackable components offer safe, ultra-compact shipping, and the fan’s simplistic design and rugged construction make it the simplest to install easiest to run fan ever.

MagFan is maintenance free, it is 100 % recyclable, and it will run on 95 % of the world’s electrical grid. DACS has won the Danish award for Sustainable Products with MagFan.

Poultry and pig production requires quite a bit of energy, but at DACS we have worked hard to reduce your operating costs to a minimum. We continuously develop products which will help you reach your goal: healthy animals and high outcome.

Focus on energy efficiency

Our philosophy is to maximize energy efficiency, and this is incorporated into everything we do. Thus all our systems are designed to give you the best energy efficiency and the most durable systems on the market. Our focus on energy efficiency means that your initial investments are earned back sooner than normally - and it just might be that in your country you could get a tax deduction because you save energy with our systems.

In the beginning of most production batches, the animals need heat to thrive, and the heaters have to run. Later on the animals produce a lot of heat themselves, and the surplus heat has to be utilized while the ventilation has to remove gazeous waste in order to keep the animals healthy and the litter dry.

Heat is a valuable resource

The surplus heat produced by the animals is a resource, and we use these calories in our ventilation system.

The DACS Corona ventilation system is very likely to be different to any other ventilation system, you have ever heard of, since it is the only ventilation system on the market that utilizes the warm air trapped in the roof space and mixes it with fresh incoming air. This means tremendous savings on your heat bill. In fact the savings means that every time you spend 1 KWh running the ventilation system, you will save 20kWh worth on your heat bill.

On top the Corona creates a very comforting airflow reaching every corner of the house. Gone is cold air fallout, draught, wet litter and the following ammonia vapor.

Heating is a cost, which can hardly be reduced in the beginning of a batch, as the animals need heat to keep body temperature. Therefore we have focused on selling the most reliable and strong warm water radiator, you can get. Our heater is galvanized and designed to withstand the harsh environment in a poultry or pig house.

Keeping track on your production data

Your entire production can be controlled using one of our ACS controllers, which ensures maximum energy efficiency and optimum climate every single day during the production period and at the same time keeps track of all relevant parameters right from feed and water consumption to daily growth. The production data can be stored for as long as you want.

MagFan - top class energy efficiency

Our wall fan, MagFan, simply is the most energy efficient fan, you will find. MagFan has been developed using the most advanced CFD design combined with full scale prototype testing in one of Europe’s most advanced test facilities. The result is an ultra high efficiency, highly flexible fan.

In a direct comparison against leading suppliers on the market today, MagFan offers at least 50 % lower energy consumption at equivalent flow rates.

In the DACS terminology sustainability is a matter of handling the resources knowingly - be it heat, electricity, installations or materials.

If you do not make the right choices in this field, your energy bills as a poultry or pig farmer may gobble up a big part of your outcome. This may in the end mean that you are no longer as competitive or solid as you would like to be.

One place where it is utmost important to focus on the use of energy, is the ventilation system.  And this is where we have focused on making the most energy efficient ventilation system on the market.

So to ensure that both your economy and your animals are safe and sound, you need to take a look at the long-term objective:

  • What are the pros and cons if you rattle along with the old ventilation system?
  • What are your energy costs with this system?
  • What are the energy costs with a new system?
  • What are the prospects on the market?
  • And where are the energy prices heading?

Our focus is on durable, energy efficient, well designed solutions that will help you stay competitive.

Our ventilation systems squeeze the very last calorie of heat out of the air in your pig or poultry house - you should not send heat out of the house when you can instead utilize this in keeping your flock dry and your economy sound.

Our wall fan, MagFan, quite simply is the most energy efficient fan, you will find on the market today. MagFan has been designed with both energy efficiency and sustainability in mind. It will work in almost every corner of the world no matter electric grid.

Try us out. You just may be surprised at what derivative savings you could get with our ventilation systems.

A house for poultry production is a climate zone where it is crucial to be able to establish and work under conditions which may differ completely from the climate outside. In order to ensure that you have the best conditions to keep the in-house climate then the roof, walls, floors and footing must be properly isolated. It is an absolute necessity that there is a moisture barrier under the floor to keep both floor and footing dry. The moisture barrier makes sure that humidity cannot penetrate the floor, but it is also essential to establish an efficient draining of the entire building land to remove water from the site. If these conditions are fulfilled you can create an optimum climate in the poultry house where your flock will thrive and grow throughout the production period.


Before a new flock arrives you need to make sure that the poultry house has been pre-heated to the desired temperature for at least 24 hours – typically 33-34˚C. The reason for this is that the surfaces in the construction need to be as warm as the air in the house. 6-8 hours before the day old chickens arrive, the litter is distributed in the house.

If the surface in the construction is not thoroughly heated it will submit cold to the air inside the poultry house which will have a negative impact on the day-old chickens and on the quality of the litter. The birds will then have a tendency to clump together and they will use unnecessary energy in the attempt to keep warm. This loss of energy results in increased mortality as well as uneven growth.

Furthermore there will be a condensation in the litter, if the floor temperature is significantly lower than the desired temperature when the birds arrive. As a rule of thumb the concrete floor must be at least 28˚C, when a new flock arrives.

For the day-old birds to maximize their genetic growth potential it is important to create a certain movement of air down by the floor already from day one. This subtle movement supplies oxygenous air to the birds and at the same time removes CO2.

As CO2 is approximately 70 % heavier than atmospheric air the concentration of CO2 will rise significantly in the occupied zone if the house is not properly ventilated from day one. Too much CO2 can repress the development of the birds’ lungs and thus reduce their ability to absorb oxygen. The result is reduced metabolism and lowered growth.


Generally there are a number of physical conditions you have to observe during the production period.

When you want the humidity in the poultry house to be significantly below the humidity in the air that is lead to the poultry house via the ventilation system, it is advisable to limit dehumidification as it is not possible to dehumidify to the wanted level (when it is raining, RH is 100 %).

If you decide to follow the programmed curve for humidity when the RH outside is about 100 %, the climate controller will continue to call for heating in order to dehumidify. This leads to a dramatic increase in heat consumption which in turn increases the need for ventilation as the temperature rises due to the heat added to the house.

The increased ventilation under these conditions may not be suitable in regard to young birds. It may cause draught and can also prompt condensation in the litter. Wet litter increases the production of ammonium. A high level of ammonium gives burnings on the birds’ pads and bodies and generally reduce the welfare of the birds. You spend more money getting lower rent ability. All in all a fool’s bargain!

The above mentioned conditions are depending on circumstances from the outside environment. It’s a physical condition you have to accept and deal with in order to be able to react in due time and avoid the negative consequences by NOT reducing the dehumidification.

DACS’ own ACS6 climate- and production controller has an outdoor humidity sensor. Via measurements from this sensor the ACS6 decides if it is possible to effectively dehumidify the poultry house. If this is not the case dehumidification is automatically reduced in order to avoid the problems mentioned above. DACS is the only company, whose controllers have this functionality.


We strongly recommend that you follow the pre-set curve for temperature in the ACS6 climate and production controller as this is the curve recommended by most hatcheries. Yet there might be local variations where it is natural to change the settings. If you choose to deviate from the recommended temperatures it may have negative influence on the welfare of your poultry. If the temperature in the poultry house is lower than the recommended your chickens will have to use unnecessary energy to keep warm. The consequence is a higher FCR.

Generally speaking poultry are too often kept too cold rather than too warm. A common mistake is to lower the temperature in the poultry house to make the chickens eat more. What is often forgotten is that a big part of the extra intake of feed is used to keep up the chickens’ body temperature as the surroundings are actually too cold. And as feed costs are significantly more than fuel it is a misinterpreted strategy to lower the temperature – not to say your profitability.

You also need to pay attention to the fact that there is a close correlation between temperature and humidity in the sense that the total energy in the air is a combination of temperature and RH. Just as we humans feel more uncomfortable in high temperatures and high humidity than in hot, dry weather, so do the chickens experience extra strain when both heat and humidity is high. On the other hand it is obvious that a low humidity will make the birds feel colder than what the thermometer shows. Thus a low humidity must be followed by a higher temperature setting to avoid the animals feeling cold. And visa versa.

In periods with warm weather the humidity of the outside air is often low which means – according to the above mentioned – that the comfort temperature is often higher than the temperature curve indicates. The ACS climate controllers from DACS automatically compensate for these conditions ensuring optimum welfare for the birds under all circumstances. If you do not want this automatic compensation or if you do not have the technical control opportunities, you need to keep a close eye on both temperature and humidity in the poultry house to make sure they match the climate curves for optimum animal welfare.