TDC, Slip/Drive and Raw Sheet Metal Connectors, Inc. rectangular duct and fittings are one part of our complete line of HVAC products. SMC manufactures coil line ductwork in 4’-5’-6’ lengths. All ductwork comes standard with stiffening beads. Ductwork is fabricated with either Snap Lock or Pittsburgh longitudinal seams. Sealant is available in the seams upon request.
Rectangular ductwork is manufactured in three different styles.
They are as follows:• Wrap Around Duct• L-Shape Duct All sizes shall be listed using outside dimensions.• 4 Piece Duct
• Please refer to the following charts for specific materials, gauges, and end treatments.
TDC Ductwork and Fittings
SMACNA recommended TDC™ duct is a 4-bolt system with a difference. Instead of cutting, assembling and installing a separate flange onto the ductwork, the TDC flange is roll formed directly onto the duct. This provides a solid metal connection that reduces leakage which is why the TDC system is the best for minimum leakage application. A TDC assembly instruction manual is available upon request.