Air Diffuser

INDULTHERM / INDULTHERM-e stands for comfortable cooling and powerful heating. In cooling mode the air diffuser operates as a highly inductive ceiling diffuser, and in heating mode it provides for large penetration depth of the supply air into the room.

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The strengths of INDULTHERM


Thermomechanical changeover from cooling to heating without an external power source. Low pressure losses provide for energy-efficient operation.


An appealing design available in square or round versions.


The air is distributed in the room draught-free with a temperature difference of up to –12K. High penetration depth in heating mode.


In cooling mode, the air diffuser operates as a highly inductive ceiling air diffuser, offering draught-free ambient air flow. As the supply air temperature increases (heating mode), it switches – independently and without an external energy supply – from horizontal to vertical air outflow with a large penetration depth. Owing to the very high induction effect in cooling mode, the air diffuser INDULTHERM is also ideally suited for use with split or multi-split air-conditioning units. The INDULTHERM-e has been specially developed for the rapid change in supply air temperatures needed in this situation. INDULTHERM-e contains an actuator motor which enables rapid changeover by means of an external control signal (0-10 V).

Sizes 600 mm and 625 mm
Types round and square
Supply air temperature difference up to –12K (cooling mode)/up to +15K (heating mode)
Air flow rates 180 - 1.000 m³/h
Room heights 3 m to approx. 7 m
Colours front plate RAL of choice
Single elements black or light grey (RAL 7035), other colours possible on request
Butterfly damper adjustable from the room

Air distribution

In cooling mode, cooled air is distributed in the room at an opimal mixture and without any draught at a termperature rate down to -12 K.

In heating mode, warm air is distributed throughout the entire room, even down to floor level, despite the difference in density.

Ambient ari flow videos INDULTHERM

Installation situation

INDULTHERM is suitable for installation in all current ceiling systems.

  • Air Diffuser - INDULTHERM

    Zollverein Essen, the most beautiful colliery in the world. The UNESCO World Heritage Site with INDULTHERM by Kiefer.

Product information und contacts

Download project reports INDULTHERM

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Kiefer Luft- und Klimatechnik GmbH

Kiefer GmbH is a leading company in the field of ventilation and air-conditioning technology. The range of services includes consulting, planning and execution of plant engineering in both comfort and industrial sectors as well as installation and maintenance. For more than 3 decades, Kiefer has also been selling worldwide high-quality ventilation components, such as linear diffusers, wall passages, displacement outlets, chilled ceiling panels and modules for concrete core cooling, all developed in the company's own laboratories.


© 2018 Kiefer Luft- und Klimatechnik GmbH