Special Conditions · Expanded master guide
Size, Pressure & Special Routing
Ten expanded field guides for small through extra-large duct, shallow and wide duct, high-pressure and negative-pressure systems, and expansion joints.
Size and pressure change the installation.
Small duct can be crushed, large duct needs controlled lifting, and pressure class, reinforcement, supports, and movement details must match the design.
Small duct can be crushed, large duct needs controlled lifting, and pressure class, reinforcement, supports, and movement details must match the design.
Every guide teaches the full task
1Before you start
2Lay it out
3Set and support it
4Make the connection
5Check the install
6Common mistakes
7Stop and ask
Size, Pressure & Special RoutingExpanded guide
Very small 4–6 inch round branch
Small terminal branch
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Medium 8–14 inch spiral branch
Typical commercial branch
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Large 16–30 inch spiral main
Main distribution
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Extra-large round industrial duct
Large process/air system
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Narrow rectangular branch under 12 inches high
Low-profile branch
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Wide rectangular duct over 48 inches
Wide trunk
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Shallow wide rectangular duct
Pancake duct
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High-pressure rectangular duct
Supply/process
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Negative-pressure exhaust duct
Exhaust/suction
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Duct expansion joint in long run
Thermal movement
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