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A GUIDE TO INSULATED HVAC DUCT SYSTEMS
insulationinstitute.orgFig. 4. Insulated flexible duct Flexibility is an advantage when installing in obstructed areas Light density fibrous glass insulation FIBROUS GLASS INSULATED HVAC DUCT SYSTEMS 5 Fibrous glass insulated flexible ducts Flexible ducts insulated with fibrous glass are an efficient, economical way to install connections between trunk