What is a required feature of a gas vent connector serving a gas fired water heater?

A gas vent connector serving a gas-fired water heater must have a continuous rise to ensure proper venting of gases. This design is crucial because it prevents the accumulation of gases that could pose a safety hazard. By maintaining a continuous upward slope, the system encourages the natural movement of flue gases, allowing them to exit effectively through the vent.

This rising characteristic not only aids in the efficient expulsion of combustion byproducts but also prevents backdrafts that could lead to dangerous situations such as carbon monoxide buildup in the living space. Ensuring that the vent connector has no horizontal sections or dips is essential for maintaining a safe and efficient venting system.

In contrast, other design options such as requiring the connector to be horizontal, insulated, or to have multiple bends can create potential issues with gas flow or increase the likelihood of condensation, and therefore are not considered best practices for the installation of gas vent connectors.