Smacna Duct Gauge Standards

Duct work to be sealed per smacna hvac table 1 2 5.

Smacna duct gauge standards.

Duct fabricated using pittsburg seams. Ductwork support ductwork support and recommended. Ductwork seal classes ductwork prone to air leakages. 24 gauge is use for the duct size up to 750 mm 30 and thickness is 0 6 mm.

A quick overview of the changes is provided in the front of this manual. While the first edition served industry very well for many years technology has continued to evolve and in response to our membership s request smacna s rectangular industrial duct. For all other ducts of any application. Hvac duct construction standards metal and flexible third edition iii foreword this third edition of the smacna commercial metal and flexible duct construction standards is another in a long line dating from the 1950s.

Located in headquarters outside washington d c the sheet metal and air conditioning contractors national association smacna an international association of union contractors has 1 834 members in 103 chapters throughout the united states canada australia and brazil. Ansi the american national standards institute has accredited smacna as a standards setting organization. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. The 1980 edition of these standards was the first publication dealing with the selection of duct gauge and reinforcement for rectangular industrial duct systems.

Smacna cad standard second edition v notice to users of this publication 1. Disclaimer of warranties a the sheet metal and air conditioning contractor s national association smacna provides its product for informational. 26 gauge is use for the duct size below 300 mm 12 and thickness 0 5 mm. Tdc cnt jnt condu loc tdc connector center of duct tdc connector.

2 500 pa w g. Duct velocity calculate velocities in circular and rectangular ducts imperial and si units online calculator. Smacna standards and manuals address all facets of the sheet metal and hvac industry including duct construction and installation indoor air quality energy recovery roofing and architectural sheet metal welding and commissioning. If the designer does not designate pressure class for duct construction on the contract drawings the basis of compliance with the smacna hvac duct construction standards is as follows.

Low and medium velocity duct system. Howard iii sheet metal and air conditioning contractors national association. Here are the few gauge system as per smacna standards. Tdc duct constructed per smacna standards first edition 1995 2.

All duct stiffened by machine formed beads spaced at 12 o c. 22 gauge for duct size up to 1200 mm 48 thickness 0 8 mm.