Fresh air dehumidifiers
Ceiling units with a fresh air inlet that dehumidify while replacing stale indoor air.
Fresh air dehumidifiers in detail
Ceiling units with a fresh air inlet that dehumidify while replacing stale indoor air.
- Fresh air intake with simultaneous dehumidification
- Duct-connected supply for uniform temperature and humidity
- Service panel for filter and component access
- Pipe-connected condensate drainage
Enquiries are answered within one business day.
The 138 – 240 L/day range in this catalogue is not a menu of sizes: each frame changes the working surface, the airflow and the volume of water the unit has to handle, so the moisture load picks the frame rather than the floor area. DVX-138 at 138 L/day is the smallest published frame here and DVX-240 at 240 L/day is the largest. 2 models are published in the range, and each one is quoted against the condition it will actually see rather than the headline figure.
Duct static, filter pressure drop and the outdoor design condition belong in the calculation, not only the volume of the room behind the unit. A fresh-air unit treats the ventilation load first, and the room load is added to it.
If the answer is a different platform, the selection check says so, with the calculation that led there.
Ventilation load and sealed envelopes
A fresh air dehumidifier is sized on the outdoor design condition, not on the room: the moisture carried in by ventilation is calculated at the design temperature and humidity for the site, then added to the internal load before a frame is chosen. That is why the same room can need a different unit in two climates.
In a sealed or passive-house envelope the unit sits on the supply path, so the ventilation rate, the filter class and any heat-recovery section belong in the same drawing. Where the outdoor air is drier than the room for part of the year, the control sequence bypasses or modulates the coil rather than running it flat out.
Where fresh air dehumidifiers are used
A fresh-air dehumidifier treats the outdoor air as it enters, so the moisture is removed at the point of entry instead of spreading through the building. DVX units cover 138 and 240 L/day with a fresh air inlet and ducted supply, and sit on the ventilation path where a filter or heat-recovery section is added in a sealed or passive-house envelope.
Further reading
Fresh air dehumidifier questions
Why dehumidify the incoming air instead of the room?
Ventilation is usually the largest continuous moisture source in a sealed building. Removing it at the inlet leaves the room unit working against a much smaller internal load.
Does it also control temperature?
The unit is built for dehumidification; the temperature change depends on the coil and air path. Where a temperature band must also be held, a constant temperature and humidity unit is the better fit.
How is the fresh air volume decided?
From the ventilation requirement of the room or from occupancy and process exhaust, then checked against what the coil can remove at the design outdoor condition.
Can it work as a combined dehumidifier and ventilation unit?
Yes. The fresh-air inlet and the treated supply are the ventilation path itself, so the unit dehumidifies and ventilates in one step. Where heat recovery is required, it is specified as part of that air path.