What would be the total allowance for a ¾" hammer lock?

The total allowance for a ¾" hammer lock is calculated based on the specific details of how hammer locks function and the space required for a secure installation. In the case of freeze-up or expansion, it's important to ensure that there is enough clearance in addition to the diameter of the lock itself.

A hammer lock is designed to provide a positive hold on the ductwork, requiring some space beyond just the size of the lock for proper installation and operation. Since the hammer lock itself is ¾", the additional allowances required for it, including ensuring that there is room for adjustments and potential expansions or contractions of the material, would bring the total to 3 inches. This total includes the lock and the necessary allowances to accommodate installation and ensure effective operation in HVAC systems.

Understanding this concept is critical for ensuring that installations adhere to best practices and avoid issues related to improper allowances that could affect the integrity and efficiency of the HVAC system.