3.1502.2 Removing Supply and/or Return Registers from Garages

Topic: 
Attached Garages
Subtopic: 
Isolating From Living Space
Desired Outcome: 
Safe removal of supply and/or return registers
For supporting material, see Referenced Standards.
TitleSpecification(s)Objective(s)
3.1502.2a
Removal of run-outs feeding the register in the garage

Supply and/or return run feeding the register will be truncated as close to the trunk line as possible

If directly connected to the plenum, it will be truncated at the plenum

If connected to a Y or T branch system, it will be truncated at the Y or T

Minimize the surface area of duct

3.1502.2b
Patching of the hole in the duct system created by removal

All holes in sheet metal ducts will be patched with sheet metal and secured with sufficient screws to hold the patch flat without gaps

If patch is large enough to flex, it shall be cross-braced

Holes left in any Y or T will be capped with sheet metal caps and fastened with at least three screws

Ensure a secure and strong patch

3.1502.2c
Sealing of the patch

All patches will be sealed with mastic meeting UL UL Underwriters Laboratories 181 and in accordance with manufacturer specifications (and mesh tape where gap exceeds 1/4")

Ensure an airtight, durable patch

3.1502.2d
Removal of discarded ducts

All abandoned ductwork will be removed from work area

Provide a clean work site

3.1502.2e
Patching of the register hole in garage

Holes created by the removal of the register and boot will be patched and taped using material meeting local fire wall codes

Prevent a fire hazard

3.1502.2f
External static pressure testing

Units will be tested for external static pressure ( ESP ESP External static pressure ) before and after work

If there is a significant rise in ESP ESP External static pressure , air flow testing according to ANSI ANSI American National Standards Institute, www.ansi.org / ACCA ACCA Air Conditioning Contractors of America, www.acca.org Standard 5 or ANSI ANSI American National Standards Institute, www.ansi.org / ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org Standard 11 will be required, and airflow will be adjusted to meet design requirements

Ensure correct system performance