Fresh Air Duct Dehumidifier removes water vapour from ducted air to help control dampness, condensation and moisture exposure in occupied rooms, storage areas and production spaces. Its compressor refrigeration circuit cools the air so water condenses on the heat exchanger, then returns drier air to the duct system.
The cabinet can serve a planned fresh-air or recirculation arrangement, keeping the equipment out of floor-level work areas. Select extraction capacity for the incoming moisture load and check airflow, duct resistance and drainage together, so dry air reaches the intended rooms.
MODEL COMPARISON
Model specifications
Model selection
- ST-26G: The smallest cabinet and lowest airflow suit limited installation space and a modest moisture load.
- ST-56G: More airflow and extraction than the smallest model, while retaining a relatively shallow cabinet.
- ST-90G: A step up in airflow and available duct pressure for small production or storage areas.
- ST-158G: Higher extraction and airflow within the same external dimensions as the 90 G size.
- ST-8KG: A larger airflow option with 220 V or 380 V supply and lower weight than the 10 KG size.
- ST-10KG: More extraction in the same cabinet dimensions as the 8 KG size, with a higher power and support load.
- ST-15KG: Additional external static pressure provides more allowance for duct resistance than the 10 KG size.
- ST-20KG: Higher airflow and pressure for distribution to several outlets, subject to duct sizing.
- ST-30KG: Higher moisture capacity than the 20 KG size at the same static-pressure rating; allow for its taller cabinet.
- ST-40KG: The largest airflow and extraction capacity in this series for larger moisture loads and distribution systems.
FEATURES
Humidity control in a permanent ducted installation
Compressor moisture removal
A reinforced compressor motor, overload protection, vibration and noise control, and resistance to cold and heat support the refrigeration cycle within the listed operating conditions. The compressor design also addresses energy use during moisture removal.
Separate setting and control ranges
The controller allows a wider setting range than the humidity range it controls. Use the control range and accuracy when matching the unit to a room requirement.
Ducted air distribution
Supply and return routing can distribute drying across the working area while keeping the cabinet clear of aisles. Leave access to service panels and a continuous route for condensate drainage.
APPLICATIONS
Where ducted moisture control is useful
Warehouses and stockrooms
Limit moisture exposure around stored goods and packaging, allowing for humid outdoor air entering through doors and ventilation.
Production and packing rooms
Reduce persistent dampness around materials and work areas where the process requires controlled humidity.
Commercial interiors
Treat the moisture load in a ducted ventilation system when floor space needs to remain available for occupants and equipment.
Basements and utility spaces
Circulate drier air through rooms affected by humid air and condensation, with a suitable drain and service access.
INSTALLATION AND SELECTION
Match moisture removal to the air system
- Use room volume, outdoor-air quantity, moisture sources and target humidity to size extraction; floor area is only one input.
- Check the complete duct pressure loss, including bends, filters and outlets, against the selected model’s external static pressure.
- Allow space for the cabinet, maintenance access and condensate drain, and select the listed electrical supply for that model.
FAQ
Using a fresh-air duct dehumidifier
How does fresh-air use affect model selection?+
Outdoor air brings a changing moisture load. Size the unit for that air quantity and its temperature and humidity, together with the room load.
Does a larger airflow rating allow longer ducts?+
Duct length also depends on available static pressure, duct size and fittings. A model with more airflow but the same pressure rating does not automatically support a more restrictive duct network.