What type of connection is required for mounting ASD fans to the piping?

The correct choice emphasizes the importance of using flexible couplings or a manufacturer's specified watertight connection for mounting Air-Stream Dehumidification (ASD) fans to the piping. This flexibility is crucial to accommodate any movement that may occur in the piping system due to thermal expansion, vibration, or other operational conditions. Flexible couplings provide the necessary adaptability while ensuring a proper seal, which prevents leaks and maintains system integrity.

Using rigid connections could create stress on the piping and the fan, potentially leading to failures or damage over time. Although welded connections provide a permanent seal, they lack the necessary allowance for movement, making them unsuitable for applications where flexing may occur. Mechanical clamps alone may not ensure a watertight seal, which is vital in maintaining the efficiency and safety of the system. Therefore, the preference for flexible couplings or specific watertight solutions makes sense in protecting the longevity and reliability of the connection between ASD fans and piping.