6.6102.7 Ducts for Supply

Ducts installed outside of the thermal envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier will be insulated to a minimum of R-8 or equivalent to local codes

Metal-to-metal or metal-to-PVC connections will be fastened with a minimum of three equally spaced screws

Flexible duct-to-metal or flexible duct-to-PVC connections will be fastened with tie bands using a tie band Tie band A strap, often made of nylon, that mechanically squeezes a flexible duct to a fitting. Must have a minimum performance temperature rating of 165° (per UL 181A-type test) and a minimum tensile strength rating of 50 pounds tensioning tool

Flexible duct between the cable tie and end of metal or PVC duct will be screwed

PVC-to-PVC materials will be fastened with approved PVC cement

Supply ducts attached to the return side of forced air systems will be:

• Attached as close to the heating, ventilation, and air conditioning ( HVAC HVAC Heating, ventilation, and air conditioning ) system's fan as possible while remaining in compliance with manufacturer specifications
• Set up to provide filtration of outdoor ventilation air before reaching the HVAC HVAC Heating, ventilation, and air conditioning system
• Attached via a mechanically fastened take off collar

In addition to mechanical fasteners, air seal duct connections will be fastened with UL UL Underwriters Laboratories 181B or 181B-M listed material

All other duct connections shall be in conformance with the applicable code adopted by the jurisdiction

Intake will be installed in accordance with all applicable code requirements and/or the most current version of ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org 62.2