For the heating of tents we are manufacturing mobile devices as well as devices in container-/trailer- design in each case in combination with a specifically matched set of tent-heating accessories, as there are Doll- blow-out towers (utility patent / patent), specially designed hot-air tubes and also ceiling-ventilators for air-recirculation to the floor area.

• they are operating by a thermostat controller fully automated below the tent ceiling in the ridge are.
  
  
• the airflow is precisely adaptable to the tent conditions over the adjustable jalousie shutters on the bottom side.
  
  
• they don't create any inconvenient draft-effects for people standing below because these devices are regulated by a 5-step-switch, this also has a positive effect concerning acoustic emissions !
  
  
• quick and easy installation provided by serially-equipped attachment eyes.
  
  
• protected from dust / humidity and acoustic emission encapsulated external-rotor ventilator motors that guarantee a long durability and safe operation.
  
  
• the electrical connection is easily provided by the serially-equipped terminal box.
  
  
• Doll DV devices have been standing the test of time for years in festival tents in aspects like energy-saving + better heat allocation.
  
  
• efficient temperature-balancing system, that can reduce heating-costs up to 30% at minimal complexity and additionally provides a better heat allocation.

The heating of large and high festival– and trade fair-tents requires an enormous amount of energy. Based on the law of physics, heat rises up and forms a heat cushion below the tent's ceiling – which is normally badly insulated, the pent-up air is getting lost transmission to the outside and in the bottom floor area is a lack of warmth.

Conventional ceiling ventilators are providing no help in tents because they don't move the air with enough directed kinetic energy,  that way the downward air-flow tears off far from the ground and the heat rises up again.

As recently as the special Doll- DV 500 devices are offering a systematic feedback of heat in the floor area and are allowing utilisation of pent-up heat, before it gets lost through the roof – and this without any draft effects! In the summer time they work as a fully-automatic aeration system !