The silencers are delivered with the SPIRAL®system seals in
the standard version. The diameter sizes d1 > 315 mm require
ordering the NSL male couplings which need to be installed in
the silencer before connecting the silencer to the ductwork. The
male fittings are available separately. They are not delivered
with the silencers. Rock wool thickness inside the silencer:
100 mm for SIRL-10 — depends on the outer cladding size.
150 mm for SIRL-15 — depends on the outer cladding size.
