Special Conditions · Install guide
Size, Pressure & Special Routing
Small and large duct, wide and shallow rectangular, high- and negative-pressure systems, and expansion joints.
Spiral & RoundSize, Pressure & Special Routing
Very small 4–6 inch round branch
Round metal · Small terminal branch
Open installation →Spiral & RoundSize, Pressure & Special Routing
Medium 8–14 inch spiral branch
Spiral round · Typical commercial branch
Open installation →Spiral & RoundSize, Pressure & Special Routing
Large 16–30 inch spiral main
Spiral round · Main distribution
Open installation →Spiral & RoundSize, Pressure & Special Routing
Extra-large round industrial duct
Round industrial · Large process/air system
Open installation →Rectangular & TDCSize, Pressure & Special Routing
Narrow rectangular branch under 12 inches high
Rectangular · Low-profile branch
Open installation →Rectangular & TDCSize, Pressure & Special Routing
Wide rectangular duct over 48 inches
Rectangular · Wide trunk
Open installation →Rectangular & TDCSize, Pressure & Special Routing
Shallow wide rectangular duct
Rectangular · Pancake duct
Open installation →Rectangular & TDCSize, Pressure & Special Routing
High-pressure rectangular duct
Rectangular high-pressure · Supply/process
Open installation →Rectangular & TDCSize, Pressure & Special Routing
Negative-pressure exhaust duct
Round/rectangular · Exhaust/suction
Open installation →Multi-SystemSize, Pressure & Special Routing
Duct expansion joint in long run
Metal duct · Thermal movement
Open installation →