3.1602.5 Return—Framed Platform

Topic: 
Ducts
Subtopic: 
Duct Sealing
Desired Outcome: 
The return duct installed to prevent air leakage
For supporting material, see Referenced Standards and Calculation of the Infiltration Credit.
TitleSpecification(s)Objective(s)
3.1602.5a
Preparation

Debris and dirt will be cleaned out of the return platform

Allow for the application of rigid materials and sealants
3.1602.5b
Infill and backing

Backing or infill will be provided as needed to meet the specific characteristics of the selected material and the characteristics of the open space

Backing or infill will not bend, sag, or move once installed

Material will be rated for use in return duct systems

Minimize hole size to ensure successful use of sealant

Ensure closure is permanent and supports any load (e.g., return air pressure)

Ensure sealant does not fall out
3.1602.5c
Sealant selection

Sealants will be continuous and be in accordance with 2012 IRC IRC International Residential Code R302.9

Select permanent sealant

Ensure sealant meets or exceeds the performance characteristics of the surrounding materials