Which of the following information is not necessary to send to the Department of Buildings (DOB)?

The type of pressure gauges is not necessary to send to the Department of Buildings (DOB) because the emphasis for reporting typically revolves around aspects that directly impact safety and compliance regulations. The location, operating temperature, and size of pressure tanks are crucial for ensuring proper operation, maintenance standards, and safety protocols. These details contribute to understanding the potential risks and the operational parameters of the system, which are central in evaluating compliance with the boiler and pressure vessel codes set forth by regulatory bodies.

In contrast, while pressure gauges are essential for monitoring system pressure, the specific type of gauge does not typically hold significance in terms of regulatory reporting requirements. The focus is more on the functionality of the gauges rather than their specific classification. Therefore, while having the proper gauges is important, their type does not hold the same level of necessity when reporting to the DOB.