Desiccant Dehumidifier
A desiccant dehumidifier removes moisture by adsorbing it onto a slowly rotating desiccant wheel rather than condensing it on cold coils, so it keeps drying in cold spaces and reaches humidity levels refrigerant units cannot. The catalog lists 125 models from brands including Munters, Quest, Ebac, Santa Fe, Dri-Eaz and Abatement Technologies.
Cat classes
Pick a size class — capacity and reach differ across the range.
How it works
Process air passes through one sector of a desiccant rotor, which strips its moisture and delivers dry air. A separate heated reactivation airstream passes through the opposite sector, driving the collected moisture off the wheel and out a wet-air duct to the outdoors. The wheel turns continuously between the two streams. Because no condensation is involved, performance holds in cold spaces and at low humidity — the regimes where refrigerant units fade — at the cost of the reactivation heat energy.
Types & variants
- Portable restoration desiccants
- Compact rotor units for structural drying alongside air movers.
- Large trailer and skid desiccants
- High-volume units ducted into buildings for major drying projects.
- Industrial process desiccants
- Fixed units holding low dewpoints for production and storage.
- Low-grain refrigerant hybrids
- Combined technologies balancing energy use across conditions.
Key specifications
| Specification | Typical range | What it means |
|---|---|---|
| Process airflow | Documented up to 3,531 cfm across listed models; the extreme low end of the range reflects accessory items | The volume of air dried per pass — the primary capacity figure. |
| Water removal rate | Documented per model listing | Moisture extracted per day at rating conditions. |
| Reactivation duct provision | Documented per model listing | The wet airstream must duct out of the dried space. |
| Power requirement | Documented per model listing | Reactivation heat makes desiccants power-hungrier than refrigerant units of similar airflow. |
How the industry sizes it
Desiccant dehumidifiers are sized by process airflow and water removal against the space volume, moisture load and target humidity. They are chosen over refrigerant units for cold spaces, deep-drying targets and dense materials; on large losses, trailer units duct dry air in and wet air out of the structure.
Applications
- Structural drying after major water losses
- Cold-space drying where refrigerant units stall
- Deep drying of hardwood, plaster and dense assemblies
- Industrial humidity control for production and storage
- Corrosion prevention during coatings and blasting work
Safety & operation
- Reactivation ducts run hot and must exhaust outdoors — venting wet air inside re-wets the building.
- Large units draw substantial power; circuits and connections are verified by qualified persons.
- Ducted deployments maintain clear egress and secured duct runs in occupied buildings.
- Electrical equipment in flooded structures waits for verified isolation before deployment.
Standards & certifications
- ANSI/IICRC · S500
- Standard for professional water damage restoration, governing drying practice.
- AHAM · DH-1
- Dehumidifier performance rating standard.
Frequently asked
Desiccant or refrigerant (LGR) — how is the choice made?
Why does a desiccant need two duct runs?
Do desiccants work in unheated buildings in winter?
Related equipment
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Sources
Every specification is verified against the manufacturer's published data, with the source linked for reference.
All models
118 models · Page 2 of 3 · Every spec cited to source
