3.1602.10 Hard and Flex Branch Ducts

Topic:

Ducts

Subtopic:

Duct Sealing

Desired Outcome:

Deliver air from trunk to termination (register/diffuser) without leakage

Manufactured Housing

	Title	Specification(s)	Objective(s)
	3.1602.10a Work assessment	Installer prework assessment will be conducted to determine: Location Connection types Leakage points Access holes will be created for the work done at each location	Verify scope of work Gain access to duct connections
	3.1602.10b Reduce excess flex duct length	Excess flex duct will be removed between the takeoff at trunk and floor register boot	Improve air flow
	3.1602.10c Duct connection repairs	Hard and flex duct branch connections will be rebuilt or repaired using compatible materials and will be mechanically fastened and sealed Ends will be sealed	Ensure lasting durable connections Minimize air leakage Maximize air flow and distribution
	3.1602.10d Repair work access	Access hole in the trunk/branch duct will be repaired and sealed Insulation will be reinstalled Bottom liner/belly will be repaired	Repair work access Minimize heat transfer
	3.1602.10e Combustion Appliance Zone ( CAZ CAZ Combustion appliance zone ) testing	CAZ CAZ Combustion appliance zone testing will be performed where combustion appliances are utilized	Identify unsafe equipment operating conditions
	3.1602.10f Performance testing	Pre- and post-retrofit duct leakage will be performance tested using a duct blaster or pressure pan, and results will be documented and reported to the homeowner and/or program	Document post-retrofit duct leakage test has been performed