All-Aluminum Media Engineered for Enhanced Reheat Capacity
The I4-D Passive Dehumidification Wheel provides superior moisture transfer through optimized Type III desiccant coating and corrosion-resistant all-aluminum construction. Designed specifically for high-humidity environments, this specialized wheel works in series with enthalpy wheels to achieve lower absolute humidity levels while reducing mechanical dehumidification loads—delivering measurable energy savings in applications where moisture control is critical.
Why I4-D Passive Dehumidification?
Enhanced Moisture Removal
Type III desiccant coating optimized for passive dehumidification applications delivers superior moisture transfer compared to standard enthalpy wheels. When paired with an enthalpy wheel in a series configuration, the I4 Passive Wheel achieves significantly lower supply air humidity levels without increasing mechanical cooling loads.
Corrosion-Resistant Construction
100% aluminum and stainless-steel construction withstands high-moisture environments that deteriorate standard wheel materials. This premium construction ensures long-term reliability in natatoriums, coastal facilities, and other corrosive applications.
Airloop™ Seal Technology
Industry-leading labyrinth seal reduces air leakage by 20% or more compared to competitive wheels, minimizing cross-contamination and reducing fan energy consumption—critical in dehumidification applications where parasitic losses impact total system efficiency.
Technical Specifications
Core Features
- Optimized Type III desiccant coating for enhanced moisture transfer
- Airloop™ labyrinth seal technology (lowest leakage in industry)
- Pacesetter controller* for precise RPM control
- 100% aluminum and stainless-steel construction
- Corrosion-resistant design for high-humidity environments
- Available in I4R field-installed configuration
- 2-year complete parts and labor warranty
*Standard feature
Available Configurations
- Standard I4 Passive: Factory-assembled wheel for new construction
- I4R Passive: Sectional design for field installation in retrofit applications
- Active Matrix Technology (3 performance levels)
Available Options
- Top, bottom, and side aluminum panels (frame enclosure)
- Epoxy coating on media for corrosive environments
- Permanently greased bearings
- Wide range of sizes to meet specific airflow requirements
How Dual-Wheel Configuration Works
Air Flow Path (Summer Mode):
- Enthalpy Wheel: Outdoor air passes through enthalpy wheel, transferring heat and moisture to exhaust stream
- Passive Dehumidification Wheel: Pre-conditioned air passes through passive wheel for additional moisture removal
- Cooling Coil: Further conditioned air enters mechanical cooling with a reduced load
- Return Path Enhancement: Passive wheel pre-cools exhaust air before enthalpy wheel, improving heat transfer efficiency
Result: Lower supply-air humidity, reduced compressor runtime, and significant energy savings compared to single-wheel or no-recovery systems.
Performance Advantages in Dual-Wheel Systems
Summer Operation:
The enthalpy wheel first reduces sensible heat and latent moisture from incoming outdoor air. The passive dehumidification wheel then removes additional moisture, achieving lower absolute humidity levels. On the return-air side, the passive wheel cools exhaust air before it reaches the enthalpy wheel, enhancing pre-cooling effectiveness and improving overall system efficiency.
Winter Operation:
Passive wheel disabled; enthalpy wheel alone provides heat and humidity recovery, ensuring energy savings during heating season without over-drying supply air.
Year-Round Efficiency:
This dual-wheel configuration optimizes dehumidification when needed while maintaining energy recovery performance across all operating conditions.
Ideal Applications
High-Humidity Environments:
- Natatoriums and aquatic centers
- Coastal climate facilities
- Indoor water parks
Moisture-Sensitive Operations:
- Food processing facilities
- Pharmaceutical manufacturing
- Museums and archive storage
Dual-Wheel Energy Recovery Systems:
- Applications requiring both energy recovery and superior dehumidification
- Facilities with high latent loads
- Systems where mechanical dehumidification costs are significant
Downloads
Brochures, Specification Sheets & Manuals
Get a Quote
If you need a quote, a selection or information, our sales department will be pleased to hear from you.