What is the maximum horizontal distance a vent can extend from its trap for a 1 1/4-inch pipe?

For a 1 1/4-inch vent pipe, the maximum horizontal distance that it can extend from its trap is 6 feet. This dimension is established by plumbing codes to ensure proper venting and to prevent issues such as siphoning or back-pressure that could impede the proper functioning of the plumbing system.

The distance is determined based on the diameter of the pipe, where larger diameter pipes can allow for longer distances due to their greater capacity to handle air flow and pressures. The 6-foot limit is a common standard within many plumbing codes, aimed at maintaining the necessary air flow through the venting system. This ensures that drainage will occur efficiently without the risk of traps becoming unsealed due to changes in pressure.

In summary, this maximum distance is critical in plumbing design to ensure that the system operates effectively, providing both drainage and proper ventilation to prevent odors and maintain sanitary conditions.