How Ducted Dehumidifiers Work


Whether you’re using a commercial dehumidifier to protect electrical equipment or to improve the indoor air quality for your staff and customers, proper ventilation is key to maintaining the correct relative humidity level. An effective approach to improving ventilation and maintaining the right relative humidity is to use a ducted dehumidifier. But what is it and how does it work?

What is a ducted dehumidifier?

A ducted dehumidifier is a dehumidifier that is connected to a duct or ventilation shaft with either the supply air, return air, or both. The duct work can be connected to an existing HVAC system or ducted out on its own to an exterior area.

Are all dehumidifiers ducted?

Depending on the application, a dehumidifier doesn’t have to be ducted to do its job.  Only dehumidifiers with a strong enough fan to overcome the static pressure of the ductwork are capable of being ducted.

Why use a ducted dehumidifier?

Often the space that needs to be dehumidified is not the same space that houses the dehumidifier, the application requires a better distributed airflow, or there are multiple spaces needing dry airflow. By ducting the dehumidifier to these remote locations, the user has the freedom to install the dehumidifier where ever it is convenient, easily distribute dry air across a wide area, or can use a single dehumidifier to dry multiple spaces. Ducted dehumidifiers also have the added benefit of being able to condition fresh outside air to the space rather than just circulate stale indoor air.

How does a ducted dehumidifier work?

A ducted mechanical dehumidifier uses a chemical reaction to condense and remove water from the atmosphere and a desiccant dehumidifier uses heat to remove water vapor. The fan or impeller, depending on the unit, has the power to overcome static pressure that is caused by ductwork, allowing proper dispersion of the conditioned air.

Why Might You Need a Ducted Dehumidifier?

1. If you have an especially large space.

If your space is very large, such as an indoor ice rink or a water treatment facility, using a ducted dehumidification system may be the best option. By nature, the system can distribute the air evenly or target trouble areas.

2. If the area needing to be dried has limited power availability or space constraints.

If, such as in an indoor pool, the area needing to be conditioned doesn’t have available space to house the dehumidifier, ducting the unit from a utility closet gives the flexibility needed to manage the space properly.

3. If your space has poor ventilation or has multiple compartments.

Spaces that have poor ventilation often benefit from a ducted dehumidifier, as the system’s design allows for fresh air to circulate through the space. Using a ducted dehumidifier can help such areas by maintaining a healthy air quality. This is also beneficial in facilities like Self-Storage or float spas where there are multiple smaller rooms that need to be addressed.

Learn More from Therma-Stor

Want to learn more about ventilation and dehumidification? In our article The Importance of Ventilation in Controlling Humidity, we discussed several ways in which ventilation helps improve indoor air quality. To find out whether your space could benefit from a commercial ducted dehumidifier, contact the team at Therma-Stor today.