How do you want your certifier to test each fan unit during recertification inspections?
Not only is this one of the most overlooked agenda items, but it is also often neglected during the construction of a cleanroom build. Not all fan units have test ports accessible from the room side, and even if they do, it is important to examine the process that goes into accessing those ports.
Based on our experience, the best solution is to have test ports installed in the ceiling adjacent to each fan unit during the construction of the space. The certifier can easily unscrew the test port cap (often by hand/tool-less) and “smoke” the port. These ports must be installed in the supply duct about five feet above each fan unit to provide a non-turbulent sample. The probes and length of air tube should be installed into the supply duct for each fan unit, often BEFORE the ceiling grid is installed. Later, the access port itself is installed into the ceiling, attaching the end of the air tube from the duct. It can be costly to install these ports after the fact.