Fuel-Gas Vent Terminations

The type of venting materials used for fuel-gas vent terminations depends on the operating characteristics of the appliance being vented. Appliances can be characterized with respect to:

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Ball valves are less restrictive to flow than other valves. The handle clearly indicates whether the valve is open or closed. Ball valves do not control water flow.

Water circulating through a hot water circulation system becomes chemically inert and does not rust the piping. But water heaters have a constant supply of fresh water with lots of corrosion-causing oxygen. Because of this, water heaters are prone to corrosion. As a result, water heaters usually have an anti-corrosion rod or sacrificial rod installed. Sacrificial anodes are typically made of magnesium or aluminum. The rod is immersed inside the water heater tank, allowing the chemical reaction from the fresh water to attack it rather than the tank. In some areas, rods are replaced regularly.

Discharge, Loop and Air Gap

The dishwasher discharge hose should be connected to the waste tee or disposer inlet above the drain trap. It is recommended that the drain hose either be looped up and securely fastened to the underside of the counter, or be connected to an air gap.

A brick wall is not necessarily considered to be waterproof. Water can penetrate through a masonry crack that is hairline or as small as 1/100th of an inch (0.3 mm). And masonry exterior-covering materials (siding) is porous and can absorb moisture during a weather event.

Remote Distribution Panels

Although this topic is covered in other areas, because the emphasis is on safety, it's important to review.

Plumbing Vents

Depending on location, there are primarily two different types of plumbing vent flashing. The most common in northern climates is the neoprene or metal boot. In Florida and in many other southern states, a lead flashing, which also protects the plastic vent pipe from ultraviolet damage, is more common. The stack vent is provided for the waste stack. The stack vent is the extension of a soil or waste stack above the highest horizontal drain that is connected to the stack. This is the main commonly-observed pipe that is observed penetrating the sloped roof surface, and it may also be visible in the unfinished attic space. This is an inspection image of a stack vent pipe penetrating the roof covering surface.