This is how some "ducting panels" look like.
http://www.google.de/search?hl=de&lr=&cr=&safe=images&um=1&i...

"Flexible Lüftungskanäle" sehen ähnlich aus:
https://www.google.de/search?q=flexible lüftungskanäle&hl=de...

The advance ETA™ phenolic foam pre insulated ducting panel is a high strength panel, in which phenolic foam is the core material, with aluminium foil reinforced on both sides. It is a non-combustible material, which has no smoke, if it catches fire. It has a bending strength of more than 1Mpa and has a thermal conductivity index of 0.020W/mk.
ETA™ Advance Ducting System
Product Advantages
ETA™ Pipe insulation material
The ETA™ phenolic foam ducting panel can be fabricated into any kind of shape and size rectangular ducts, bends, reducer etc. by cutting ,notching and adhesive glueing, and can be assembled into HVAC ducts with various specifications using a combustion resistant flange jointing system.
http://www.pulsemart.com/ducting.html
(In diesem Fall dürfte der Werkstoff nicht gebogen werden, sondern geschnitten).

All of of this has been carried out by relatively low cost and easily installed ducting panel structures which do not require the extensive use of thermal compensation connectors, etc.
http://www.patents.com/us-4253821.html

Polyurethane and Phenolic insulation panels (pre-insulated air ducts)Traditionally, air ductwork is made of sheet metal which is installed first and then lagged with insulation as a secondary operation. Ductwork manufactured from rigid insulation panels does not need any further insulation and is installed in a single fix. Light weight and installation speed are among the features of preinsulated aluminium ductwork, also custom or special shapes of ducts can be easily fabricated in the shop or on site.

The ductwork construction starts with the tracing of the duct outline onto the aluminium preinsulated panel, then the parts are typically cut at 45 degree, bent if required to obtain the different fittings (i.e. elbows, tapers) and finally assembled with glue. Aluminium tape is applied to all seams where the external surface of the aluminium foil has been cut. A variety of flanges are available to suit various installation requirements. All internal joints are sealed with sealant.
:
Flexible Ducting
Example of flexible ducting.Flexible ducts, known as flex, have a variety of configurations, but for HVAC applications, they are typically flexible plastic over a metal wire coil to make round, flexible duct. In the United States, the insulation is usually glass wool, but other markets such as Australia, use both polyester fibre and glass wool for thermal insulation. A protective layer surrounds the insulation, and is usually composed of polyethylene or metalised PET. Flexible duct is very convenient for attaching supply air outlets to the rigid ductwork. However, the pressure loss through flex is higher than for most other types of ducts.
http://en.wikipedia.org/wiki/Duct_(HVAC)

Flexible air dispersion ducts
http://www.centrumklima.co.uk/en,produkty-wentylacja-klimaty...

Sie wählen aus der Produktvielfalt mit einer hohen Anzahl an Standardvarianten von Flexrohr, Wellrohr und anderen Kunststoffrohe oder entscheiden sich für die individuelle, spezielle Ausführung. Westaflex bietet für jede Anforderung die passende Rohrvariante
http://www.westaflex.com/produkte

4.7.6 Flexible Lüftungskanäle
1) Flexible Kanäle sind zulässig für örtliche Absaugungen sowie Apparateanschlüsse inklusive Manschetten für Ventilatoren, Monoblocks und dergleichen.
http://www.suissetec.ch/library/downloads/merkblaetter_tba/l...