Hvac Duct Construction Standards Smacna

Use the ward h angle on rigidty class f g and h use the ward j angle on rigidity classes above h the tables as shown herein are the smacna tables with those interpretations already substi tuted.

Hvac duct construction standards smacna.

Hvac duct construction standards eli p. Ansi the american national standards institute has accredited smacna as a standards setting organization. Continuing to build on the history of the duct construction standards this new edition represents the state of the art in sheet metal duct fabrication and installation. The fourth edition of smacna s flagship hvac duct construction standards metal flexible is now available for 45 day public review.

For all other ducts of any application. 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. For all ducts between the supply fan and variable volume control boxes and 1 250 pa w g. When referring to table 1 3 thru table 1 10 in the smacna hvac duct construction standards 2nd ed 1995 use the ward e angle on rigidity class e and below.

The third edition of the hvac duct construction standards metal and flexible is intended primarily for commercial and institutional duct construction. 3 31 2016 12 13 19 pm. A quick overview of the changes is provided in the front of this manual. 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.

3rd edition 2005 396 pages. The third edition of the hvac duct construction standards metal and flexible is intended primarily for commercial and institutional duct construction. 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. This american national standard ansi smacna 006 2006 contains tables and details for constructing ductwork for to 10 wg positive and negative pressures.

Documents preceding 3rd edition hvac dcs hvac duct construction standards metal and flexible. Howard iii sheet metal and air conditioning contractors national association.