6.6102.7 Ducts for Supply

Topic: 
Supply
Subtopic: 
Components
Desired Outcome: 
Supply ducts effectively move the required amount of air and prevent condensation
For supporting material, see Referenced Standards.
TitleSpecification(s)Objective(s)
6.6102.7a
Duct design and configuration

Duct shall be designed in accordance with the applicable codes adopted by the jurisdiction

Effectively move the required volume of air

6.6102.7b
Duct insulation

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

Prevent moisture condensation

6.6102.7c
Duct support

Ducts will be supported as required by the applicable code adopted by the jurisdiction for the type of duct used

Effectively move the required volume of air

Preserve integrity of the duct system

6.6102.7d
Duct connections

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

Effectively move the required volume of air

Preserve integrity of the duct system and building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

6.6102.7e
Duct materials

Flexible duct materials will be UL UL Underwriters Laboratories 181 listed or Air Diffusion Council approved

Effectively move the required volume of air

Preserve integrity of the duct system and building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

6.6102.7f
Outdoor air intake location

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

Reduce opportunity for contaminants to enter the building through the ventilation system