Technical Bulletin # 2017-1
WARDFlexMAX Fire Rated Construction
WARDFlexMAX Corrugated Stainless Steel Tubing now meets the ASTM E84 flame spread and smoke density criteria of 25/50 or less. This allows installation in a plenum without the need to remove the coating from the CSST. In addition to these instructions all local building codes need to be followed when installing WARDFlexMAX in a plenum. Most building construction codes require materials located in a plenum to have a flame spread/smoke density index of 25/50 or lower. Local codes may differ from this criteria and should be reviewed to determine that there are no additional requirements for this type of installation. In the event that there is a difference between local code and these instructions, the local code shall take precedence.
All other installation instructions in the WARDFlex Design and Installation Guide are unaffected by this update. If there are any questions please contact Ward Manufacturing.
Release On: 9/1/2017