FavoritePlease sign in to add this to your favorites. Topic: Supply Subtopic: Special Considerations Desired Outcome: Safe removal of garage supply vents Manufactured HousingPrintCopy to ExcelEmail TitleSpecification(s)Objective(s) 6.6188.2a Removal of supply/return in garage Supply run feeding the register will be truncated as near to the supply plenum as possibleIf directly connected to the plenum, the supply run will be truncated at the plenumIf connected to a Y or T branch system, the supply run will be truncated at the Y or TReturn grille located in garage will be removed in the same manner as supply Minimize duct leakage 6.6188.2b 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 gapsHoles 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 6.6188.2c Sealing of the patch All patches will be sealed with mastic meeting UL UL Underwriters Laboratories 181 and in accordance with manufacturer specifications Ensure an airtight patch 6.6188.2d Removal of discarded ducts All abandoned ductwork will be removed from work area Provide a clean work site 6.6188.2e 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 codes Prevent a fire hazard 6.6188.2f External static pressure testing Units will be tested for external static pressure ( ESP ESP External static pressure ) before and after workIf there is a significant rise in ESP ESP External static pressure , air flow testing will be required Ensure correct fan performance 6.6188.2g CAZ CAZ Combustion appliance zone testing CAZ CAZ Combustion appliance zone testing will be performed where combustion appliances are utilized Identify possible conditions that can cause unsafe equipment operating conditions Previous Detail Back to 6.6188 Special Considerations Back to Top