Hvac Duct Construction Standards Pdf

2 500 pa w g.

Hvac duct construction standards pdf.

A quick overview of the changes is provided in the front of this manual. Information required for duct construction. Information required for duct construction 1. Hvac duct construction standards metal and flexible.

10 9 standard duct sizes 32 11 0. A comprehensive duct layout indicating sizes design airflows pressure class and routing of the duct system. For all other ducts of any application. For all ducts between the supply fan and variable volume control boxes and 1 250 pa w g.

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. This is the final session in a three part series. Ductwork design considerations 33. Duct size duct gauge joint length wide side connector narrow side connector 0 12 26 59 flat slip t 6 24 ga flat drive t 1 24 ga 13 18 26 59 standing slip t 11 26 ga flat drive t 1 24 ga 19 30 26 56 t d c.

Smacna hvac duct construction standards metal and flexible third edition 2005. The types of fittings to be used based on the designer s calculations of fitting losses i e square versus 45 entry taps conical versus straight taps etc. 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. A comprehensive duct layout indicating sizes design airflows pressure class and routing of the duct system.

The types of fittings to be used based on the designer s calculations of fitting. Most air conditioning and heating systems require some form of duct work to channel or direct the. Duct construction reinforcement 20 9 1 duct sheet metal thickness 20 9 2 duct hanger spacing 21.