What is required for vent connector joints or collars?

For vent connector joints or collars, the requirement is to use screws. This is because screws provide a mechanical fastening that ensures a secure and tight connection, which is crucial in maintaining system integrity and preventing leaks. Properly secured vent connections are essential for effective venting and safe operation of heating appliances, as any looseness or failure can lead to hazardous conditions such as backdrafts or the escape of combustion gases.

Other methods like welded connections or adhesive connections may not be suitable in this context as they can be less accessible for maintenance and adjustments, and in some cases, might not provide the necessary flexibility or resilience needed for vent systems. Clamps can be used in certain circumstances but are not the primary method required for securing joints in vent connectors, as they may not provide the same level of reliability and robustness as screws in this application.