Roxul Industrial Insulation Process - Manual (Page 84)

Insulation of
flue gas duct
s
1.7.3 Acoustic insulation of flue gas ducts
The thermal insulation of flue gas ducts
influences the propagation of airborne noise and
structure-borne noise. The effects of this depend
on many factors, such as the frequency, the noise
pressure level and the structure. The following
structural measures influence the acoustic
properties of an insulation system:
Changing the insulation layer thickness and/or
the apparent density of the insulation
Changing the clear distance between the flue
gas duct and the cladding
Acoustic decoupling of the cladding from the
flue gas duct using elastic elements within the
support construction and spacer (e.g. omega
clamp, rubber elements, steel wool pads)
Increasing the basic weight of the cladding
through the choice of material or sheet
thickness
Internal coating of the cladding with sound-
deadening materials
Construction of the insulation in multiple
layers, with at least two separate insulating
layers and cladding
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