Plenum
Housing - Minimum 26 gauge (.55mm) for uninsulated assemblies
or 28 gauge (.47mm) for insulated assemblies, with round connection
collar
Flexible
Air Duct Connection - UL Classification Class 0 or 1 (by
others)
R-6.3
Duct Liner - Models 505RD, 507RD and 509
Plaster
Flange - Standard grille clearance is 2.5" (64mm)
minimum from radiation damper closing
Alignment
Indicators - Our unique pre-marked alignment indicators
make installation easy. They are set to accept 16 gauge rails
that attach to the ceiling truss
Damper
Assembly - Our damper assemblies are built through our
exclusive partnership with Manufactured Air Products, a subsidiary
of Nailor Industries, one of the most trusted names in ceiling
radiation and fire dampers.