Similarly to the Sonoduct AD-L, this model is based on the standard version
of the Aluduct combined with thermal and sound insulation, and intended for
building mechanical and heat recovery ventilation systems.
An added feature which makes this model stand out from the flexible ducts is
the vapour barrier film laid between the inner ducts and the mineral wool insulation.
The vapour barrier keeps all condensate resulting from temperature differences away
from the mineral wool to keep it dry; otherwise, humidity might reduce the sound and
thermal insulating performance of the material.
