3.1602.17 Forced Air—Air Sealing System Components—Low Rise

Topic: 
Ducts
Subtopic: 
Duct Sealing
Desired Outcome: 
Ducts and plenums are sealed to prevent leakage
For supporting material, see Referenced Standards.
TitleSpecification(s)Objective(s)
3.1602.17a
Duct boot to interior surface

Gaps between boot and gypsum less than a 1/4" will be sealed using mastic

Gypsum edge will be wetted before applying mastic

Prevent air leakage
3.1602.17b
Wooden plenums and building cavities

Accessible connections and joints will be made airtight using approved material

Ensure ducts and plenums will not leak out of or into return or supply plenums and ducts
3.1602.17c
Air handler cabinet

Joints will be closed

Cracks and holes not needed for proper function and service of unit will be sealed using removable sealant (e.g., UL UL Underwriters Laboratories 181 approved mastic tape)

Reduce air leakage while maintaining accessibility
3.1602.17d
Filter slot

A pre-manufactured or site-manufactured durable and airtight filter slot cover will be installed

Reduce air leakage while maintaining accessibility