What is the minimum size for a relief vent when battery venting laboratory sinks?

The minimum size for a relief vent when battery venting laboratory sinks is 2 inches. This size is specified to ensure adequate drainage and to prevent potential siphoning or backpressure issues that could arise from multiple sink fixtures being connected to a single venting system.

Larger vent sizes help in maintaining proper air flow and prevent the creation of vacuum conditions that might hinder the drainage performance of sinks, particularly in laboratory settings where the fixtures may frequently be used simultaneously. A 2-inch vent is generally sufficient to handle the volume of air required for adequate venting of multiple sinks, thus promoting proper drainage and maintaining the integrity of the system.

Smaller vent sizes, such as 1 inch or 1.5 inches, do not provide the necessary capacity for effective venting in this scenario and could lead to performance issues. A 2.5-inch vent, while larger than necessary, might not be commonly required for typical battery venting configurations, thus making 2 inches the standard for this application according to current plumbing codes.