Overview
EXINDA is an ERV engineering manufacturer focused on decentralized Energy Recovery Ventilation (ERV) systems for North American residential and multi-family buildings, with HVI-tested and CSA/UL-compliant products engineered for ASHRAE 62.2 ventilation requirements and widely deployed in retrofit and low-plenum construction projects through distributor and contractor networks. This case study examines the real-world implementation of the Exinda 95 CFM Ultra-slim ERV within a multi-family residential development in Washington.
PROJECT AT A GLANCE
A multi-family residential apartment development located at 1529 24th Avenue, Washington, USA required a decentralized mechanical ventilation system to meet modern indoor air quality and energy efficiency requirements in a space-constrained building envelope.
The project includes 43,354 sq ft of total building area and 107 residential units, requiring individual in-unit ventilation systems to ensure balanced fresh air distribution across all apartments.
EXINDA 95 CFM ultra-slim ERV units (90–95 CFM class) were selected for decentralized ceiling installation to accommodate tight ceiling plenum conditions while maintaining full ventilation compliance.
Project Summary
| Category | Specification |
|---|---|
| Project Type | Multi-Family New Construction |
| Location | 1529 24th Avenue, Washington, USA |
| Building Size | 43,354 sq ft |
| Units Served | 107 Units |
| Ventilation Strategy | Decentralized In-Unit ERV System |
| Airflow Design | 90–95 CFM per unit |
| Equipment | EXINDA 95 CFM ultra-slim ERV |
| Installation Type | Ceiling-mounted decentralized system |
| Key Constraint | Low ceiling plenum + limited installation space + cold climate operation |
| Compliance Target | ASHRAE 62.2 |
DESIGN CHALLENGE
Engineering Constraint
The building presented significant mechanical design limitations due to restricted ceiling plenum height and limited routing space for ducted ventilation systems. Conventional centralized ERV configurations were not feasible without impacting architectural ceiling heights and structural coordination.
In addition, the project required reliable winter operation under cold climate conditions, where ventilation systems must remain stable during sub-zero outdoor temperatures.
Engineered specifically to satisfy the balanced ventilation ventilation rate mandates of ASHRAE 62.2 for multi-family residential buildings operating under North American mechanical code requirements.
Eliminates common multi-family drop-ceiling condensation risks and installer mismatch issues via an integrated auto-balancing ECM system that requires no complex condensate drain piping.
COMPETITOR DESIGN CONTEXT
Typical multi-family ventilation systems in similar Washington-region developments rely on centralized ERV systems or standard-height ducted ceiling units, which often require additional ceiling space, longer commissioning time, and manual airflow balancing.
For projects specifying Panasonic FV series, Broan ERV systems, or RenewAire residential ERVs, EXINDA offers a compact engineering alternative with equivalent airflow performance and certified compliance parameters.
ENGINEERING SOLUTION
The EXINDA system was implemented as a decentralized in-unit ventilation solution using ultra-slim ERV units designed for shallow ceiling cavities.
Each residential unit operates independently, eliminating the need for shared duct risers and reducing system balancing complexity.
Key System Features
- Ultra-slim 9.7-inch chassis for shallow ceiling installation
- 90–95 CFM adjustable airflow range per unit
- Integrated ECM motor with auto-balancing airflow control
- Exhaust defrost function for cold winter operation
- Decentralized in-unit ventilation architecture
- High-efficiency energy recovery core (heat + moisture transfer)
- UL1812 safety and CSA439 performance certified system
The exhaust defrost function ensures stable operation in cold climates, preventing performance degradation during low outdoor temperatures, making the system suitable for Washington-state winter conditions.
TECHNICAL COMPARISON
| Parameter | Conventional ERV System | EXINDA 95 CFM Ultra-Slim ERV |
|---|---|---|
| Installation Depth | 12–15 inches | 9.7 inches |
| Airflow Control | Manual balancing required | Auto-balancing ECM system |
| System Architecture | Centralized duct system | Decentralized in-unit system |
| Cold Climate Operation | External defrost dependency | Built-in exhaust defrost system |
| Ceiling Modification | Required | Not required |
| Commissioning Effort | High | Reduced |
INSTALLATION OUTCOME
Structural Impact
The ultra-slim design enabled full integration within existing ceiling cavities, eliminating the need for structural ceiling modification across all 107 residential units.
Construction Efficiency
Auto-balancing airflow technology significantly reduced field commissioning and balancing effort, improving installation speed and consistency.
Cold Climate Performance
The integrated exhaust defrost system ensured stable airflow and heat recovery performance during winter conditions, maintaining ventilation reliability in low-temperature environments.
Ventilation Performance
Balanced airflow was achieved across all units, supporting compliance with ASHRAE 62.2 indoor air quality requirements.
ENGINEERING INSIGHT
Apartment ventilation systems in Washington-region multi-family developments must address three simultaneous constraints: shallow ceiling cavities, cold climate operation, and code-driven ventilation requirements.
Decentralized ultra-slim ERV systems provide a direct engineering solution by combining compact form factor, automatic airflow balancing, and integrated winter defrost functionality.
WHY EXINDA
EXINDA ERV systems are increasingly selected in North American multi-family projects due to their ability to:
- Fit shallow ceiling plenum conditions without structural modification
- Support ASHRAE 62.2 compliant ventilation design
- Maintain stable operation in cold winter climates
- Reduce commissioning and airflow balancing complexity
- Enable scalable decentralized ventilation design for multi-unit housing
CONCLUSION
This Washington multi-family project demonstrates that EXINDA 95 CFM ultra-slim ERV decentralized ERV systems can successfully resolve installation constraints in new construction environments with limited ceiling space and cold climate operation requirements.
By integrating auto-balancing airflow control and exhaust defrost functionality, EXINDA enables reliable, code-compliant ventilation performance without structural compromise.
