Is it true that flexible connections may be used to provide access to an in-line fan?

The assertion that flexible connections may be used to provide access to an in-line fan is not true; rather, the use of flexible connections in this context is restricted according to the NFPA 96 standard. The standard emphasizes that while flexible connections can be beneficial in reducing vibrations and allowing for movement, they are generally not permitted for providing access to equipment such as in-line fans due to concerns related to fire safety and operational integrity.

In-line fans must be secured properly to ensure that they function correctly and safely. Relying on flexible connections for access could introduce potential hazards, including the risk of disconnection during operation or fire events, which could compromise the ventilation system's effectiveness. Therefore, fixed duct connections are preferred to guarantee a stable, safe, and reliable installation that aligns with safety standards and practices in commercial cooking operations.