Is it Okay to Install a Warm Bath Heater Without a Backdraft Damper?

If you choose a warm air bath heater for your bathroom, is it possible not to install a backdraft damper? What is the function of a backdraft damper?

Can a warm air bath heater be installed without a backdraft damper?

No, it cannot. A warm air heater consists of an air inlet and an air outlet. If a backdraft damper is not installed, it may lead to outdoor air backflow, which would affect the indoor temperature rise. With a backdraft damper installed, indoor air circulation can be improved, allowing the temperature to rise faster. Additionally, it also prevents odor from the bathroom from coming back inside, making it very useful. Some devices come with a built-in backdraft damper; if not, you will need to purchase one separately.

What is the function of a backdraft damper?

1. Whether installed in exhaust or flue ducts, a backdraft damper is necessary. The principle of a backdraft damper is simple—it has a spring-loaded flap that can only open outward. In kitchen exhaust ducts, a backdraft damper is needed so that, even if there is wind in the flue, it cannot be blown open.

2. This prevents the cooking odors and smoke from entering your home when cooking. When your kitchen range hood is turned on, the fan will open the damper to expel the smoke. The damper operates unidirectionally, thus avoiding backflow issues. Additionally, it can secure the flexible duct of the range hood, which is why developers are often required to provide one. If you believe the developer's damper quality is inadequate, you can replace it during renovations to achieve better smoke extraction.

3. Is a plastic or stainless steel backdraft damper better?

There are various materials for backdraft dampers, including plastic and stainless steel. Compared to plastic, stainless steel is more durable and classic, especially considering the environment where it will be used, such as a bathroom, which is prone to moisture and corrosion.

Furthermore, plastic dampers can age more easily and have a shorter lifespan, leading to the hassle of replacement. It is better to choose a stainless steel damper, which also has good fire resistance.

In summary：the above explains why it is necessary to install a backdraft damper with a warm air bath heater. Installing one has many benefits—it prevents outdoor air from backflowing into the room and provides better insulation.