What is the primary purpose of a gasket in bolted duct connections?

The primary purpose of a gasket in bolted duct connections is to prevent air leaks. Gaskets create a seal between two surfaces, ensuring that air or gas does not escape from the duct system. This sealing is crucial in maintaining the efficiency of heating, ventilation, and air conditioning (HVAC) systems by preventing loss of conditioned air and improving energy efficiency.

While a secure fitting is important for overall duct integrity, the gasket's main function is to address any potential gaps that might allow air to leak, ensuring a proper seal. Supporting the weight of the duct and enhancing aesthetic appeal are not functions of a gasket; these aspects are managed through the design and installation of the duct support system and overall ventilation strategy.