A forward-curved fan is typically used for transferring large volumes of air with a minimal wheel diameter. These fans are capable of moving a significant amount of air at lower speeds and are commonly used in HVAC systems due to their efficiency in providing high airflow with low noise levels.

The typical sequence for cleaning an HVAC system is return, air handler, and then supply. This sequence ensures that contaminants are removed in the direction of airflow, starting from where air enters the system (return) to where it is distributed (supply). Cleaning the air handler in between ensures that the central component of the system is cleaned before air moves through the supply ducts.

When a properly wired condensate pump fails, it will turn off the HVAC system. This safety feature prevents water damage or overflow by stopping the HVAC system if the pump or its associated components are not functioning correctly.

The most effective way to test the function of a condensate pump is to fill the condensate pan with clean water. This method allows the pump to operate under normal conditions, ensuring that it can properly activate and pump out the water as it would in a real-world scenario. Unplugging and plugging in the pump, disconnecting the condensate drain line, or filling the pump with water directly do not simulate normal operational conditions and might not effectively test the pump's functionality in actual use.