Which of the following is NOT a characteristic of proper venting?

The characteristic that is NOT associated with proper venting is that it can be made from any material. Proper venting requires specific materials that are suitable for the type of vent being installed. For instance, venting for gas appliances must be constructed from corrosion-resistant materials that can withstand the high temperatures and pressures that may occur in operation. Using inappropriate materials, such as standard ductwork or materials not rated for exhaust, can lead to system failures, leaks, or even dangerous situations like backdrafting of combustion gases.

In contrast, rising at a specific angle is important to ensure that the venting system allows for efficient flow away from the appliance and prevents condensation from accumulating. Proper air circulation is also crucial, as it helps to maintain balance within the system and ensures effective operation. Additionally, careful planning for multiple connections is necessary to avoid blockages and ensure that each segment of the vent is able to function correctly without interference.