Figure 159 - Roof To Duct Installation (Horizontal Discharge); Figure 158 - Duct Penetration Of Roof - Pace PAI Installation And Assembly Manual

PACE │ Installation & Assembly Manual

Figure 158 - Duct Penetration of Roof

• Seal all penetrations into the ducts until water-
tight. Use a minimum of duct penetration when
attaching the supports.
• Provide adequate clearances between the ducts
and roof penetration openings.
• Duct systems should not be pressurized without
sufficient time for curing the sealant systems. Fol-
low the sealant manufacturer's recommendations
for applying the sealant.
• Support the ducts to avoid the transfer of duct
weight across flexible connections as shown in
Figure 159 on page 96.
• Horizontal ducts should be pitched and provided
with drainage outlets.
• Install the ducts at a height sufficient to install
roofing and flashing. Refer to the Duct Connection
Guidelines on page 94 for more information.
Issue Date: 07/03/2018
Upper Duct Section Not
Continuous Through Roof
Sealant
Wood Nailer Norminal 2 X 4
Flashing Receiver
Lower Duct Section
Counterflashing
Curb
Base Flashing
Roofing Plies
Deck
SECTION 3 - HANDLING, STORAGE, AND INSTALLATION
Upper
Section
Cant Strip
Duct
Seams And
Joint In Ducts
Roof
Curb
Figure 159 - Roof to Duct Installation (Horizontal
Discharge)
96
LD06494a
Front Or Rear
Discharge Unit
Duct Wall Penetrations
Roof Support
Elevate Bottom Of Duct
LD06337b
Form PA102.20-N1