Reviewed installation for attic gas furnace and ac installation. Trunk system is bubble wrapped and could not see how well sealed the main trunk is. Flex ducts come off of system, most likely there is wall stack feeding the first floor. Covered all of the supply vents for registers and connected the fan to the return. Turned on system and ramped up the pressure to 25 Pascals. Measured duct leakage. Found several areas of leakage around cabinet and return connections. Sealed with tape. Remeasured at 181 cfm25.
