novel type blow-out jalousie for a noticeably equal warmth-allocation in the greenhouse. Optionally available blow-out cone for application of a perforated warm-air film tube.

high energy prices are demanding efficient heating ­ systems for horticulture. By the use of the paten­t annular gap recuperator these devices are having a German TÜV- approved substantially higher system-efficiency as conventional heating systems. As with this Doll-patent the radiant heat of the combustion chamber, which otherwise turns out to be lost heat, becomes absorbed by the recuperator and is being transformed again into useful heat. 

• very compact, light and aerodynamically efficient construction design.
  
  
• no freezing.
  
  
• optionally for equipment with oil or gas blower burner.

• special-combustion chamber and recuperator made out of stainless-steel.

• low indoor pollutants and radiation radiation losses.

• high efficiency by the usage of the revolutionary, new and also economical combustor geometry.

• special-sickle ventilator for a smooth and silent run, with high air throughput. 

• equal heat-allocation with no exhaust lines attached or with film tubes.

• applicable overhead-attached, compact construction layout.

• casing fully zinc-coated and additionally plastic-coated.

• exhaust nozzles on the side for simple connection with the exhaust fume line.

• very easy installation over 4 serially equipped attachment eyes.

• easy servicing and cleaning, easy to maintain by an unproblematic access to all parts and components.

• practical round form, versatile installation options.

• installation possible above the cultivation area, thereby no interference with the usable surface. 

• novel, specially design blow-out jalousie for an homogeneous heat allocation and adjustable heat-recycling down to the floor. 

• no generation of expensive stand-by heat as like warm-water heating system-operation. 

• compact type of construction with backside ventilation for reduction of device-limited unheated zones in the building. 

• system stand-by and system failure optically observable via signal lamps.

• selector switch for heating or aeration mode-

• delivery as a complete UNIT with burner, switching board and thermostat controllers, completely built up and wired.

• special-coating finish for minimal light absorption.

• Quick and easy installation in the greenhouse
• Burner and flue gas outlet on opposite
• sides Space-saving installation, e.g. above the sliding door with minimal distance to the gable wall
• Stainless steel combustion
• chamber + heat exchanger boxes Easy service + cleaning through inspection doors on the heat exchanger Horizontal + vertically adjustable
• heat distribution over the entire width of the device
• Double-wall construction, radiation-insulated
• Selector switch for heating or ventilation mode
• Control cabinet with operating and fault messages
• Versatile application possibilities thanks to extensive accessories
• Can be used as a hanging unit, stand-alone unit or for under-table heating v Modular design consisting of basic unit, fan section with axial or radial fan and outlet box with long-throw louver or for foil hose connection
• Discharge head to the front, right, left, bottom and top possible
• Assembly and installation rails enable installation on the floor or the insertion of cross braces in the gable space
• Eyelets on the top for hanging with chains possible