True or False: A bypass humidifier must always be installed on the supply.

A bypass humidifier can indeed be installed in various configurations, and it does not necessarily have to be placed on the supply side of the HVAC system. Typically, bypass humidifiers are designed to work in conjunction with forced air systems, utilizing the return duct for drawing air through the humidifier before it enters the furnace or air handler.

This configuration allows the humidified air to mix with the supply air effectively, ensuring that moisture is distributed throughout the home. Therefore, placing a bypass humidifier on the return side can be just as effective and is often more practical in certain installations. The statement that it must always be installed on the supply is incorrect, as different setups and specific installation requirements can vary based on the overall HVAC design and the specific needs of the space.

Additionally, the option regarding model specifications may lead to confusion, as the installation instructions will generally dictate the proper placement according to the manufacturer's guidelines, not just the model itself. Hence, the flexibility in installation locations is a key component of the correct understanding of bypass humidifier functionality.