Instructions / Assembly

Using tape or mastic and screws to make a connection
Flexible Duct Connection
(Metallic)
• Cut completely through duct and trim
edge
• Fold back vapor barrier and insulation
• When using mastic, apply uniformly to
collar
• Slide 1” of core over fitting
• Secure connection with #8 sheet metal
screws spaced equally around
circumference. Use 3 screws for
diameters under 12” and 5 for diameters
12” and over
• When using tape (press. < 4”), seal core
to collar with 2 wraps of duct tape
• Pull vapor barrier and insulation back
over the core
• Tape barrier with 2 wraps of duct tape