EC Fan-Wall SolutionModernize ventilation & HVAC with the LONGWELL EC FanGrid
Replace a single ageing belt-drive fan with a parallel array of high-efficiency EC plug fans. Higher airflow, ~30%+ lower energy, built-in N+1 redundancy — installed straight into your existing air-handling unit.
Five reasons to retrofit with a LONGWELL FanGrid
Instead of one large fan doing all the work, the FanGrid shares the duty across many small EC fans running in parallel — the change that unlocks efficiency, redundancy and easy maintenance.
High efficiency
EC technology cuts ventilation energy by around 30% versus legacy AC fans — and more under strong variable-load profiles.
N+1 redundancy
Fans run in parallel; if one stops, the others automatically speed up. No single point of failure, no forced shutdown.
Modular plug & play
A tailor-made kit of identical EC plug-fan modules drops into the existing AHU — fast, low-disruption installation.
Lower noise
Optimised aerodynamics and precision balancing bring running noise down for better working and public environments.
Fast payback
Energy and maintenance savings typically return the investment in about 2–3 years.
Retrofit sectors
Any facility running legacy AHU fans can benefit — especially where uptime, air quality and energy cost matter most.
Data centres
Efficient, stable cooling for critical server halls; tight temperature/humidity control and higher uptime.
Office buildings
Better indoor air quality with markedly lower energy and noise — a healthier, more comfortable workplace.
Airports
Reliable ventilation and air circulation for high-traffic, complex spaces at lower operating cost.
Pharmaceutical plants
Meets strict cleanliness and temperature/humidity requirements to protect product quality.
Hospitals
High-grade filtration and controlled airflow that help reduce cross-infection risk.
Commercial & industrial
Flexible, tailor-made solutions for malls, factories and logistics centres.
A modular EC fan-wall, built to fit your AHU
The FanGrid ships as a tailor-made retrofit kit with every component included — engineered as a form-fit replacement that drops straight into your existing air-handling unit.
- Modular steel frame — identical EC plug-fan modules, arranged to match your AHU footprint.
- High-efficiency EC plug fans in parallel — airflow scales with fan count, pressure stays constant.
- Adaptable sealing plates for a clean, leak-free fit against the existing housing.
- Central control & regulation, integrable with your building management system (BMS).
Case studies
Representative retrofit projects. Figures describe the application scenario and typical results; they are not attributed to any named client.
| Project | Air volume | Installed power | Energy saving | Payback | Also improved |
|---|---|---|---|---|---|
| Office building retrofit | ≈ 75,000 m³/h | 3 × 11 kW | ≈ 35 %* | ≈ 2.5 yr | Markedly lower noise |
| Airport terminal ventilation | ≈ 120,000 m³/h | 4 × 15 kW | ≈ 30–40 %* | ≈ 2.8 yr | Balanced supply air |
| Data-centre cooling upgrade | — | EC plug-fan array | ≈ 35 %* | ≈ 2.3 yr | Fault rate ≈ 25% lower |
* All performance figures are indicative. Final selection is confirmed against the actual duty point (airflow / static pressure / voltage / control mode) and validated per project. Products are tested to AMCA 210/211 methods; third-party test reports available on request.
Efficiency & return on investment
Replacing old, inefficient fans with high-efficiency EC fans is the fastest way to cut ventilation energy and CO₂. The retrofit is a small fraction of the overall system cost and is typically recovered within two to three years.
* All performance figures are indicative. Final selection is confirmed against the actual duty point (airflow / static pressure / voltage / control mode) and validated per project. Products are tested to AMCA 210/211 methods; third-party test reports available on request.
N+1 redundancy & a clean swap for obsolete fans
No single point of failure
A FanGrid is an array of EC fans in parallel. If one fan faults, the remaining fans automatically increase speed to maintain airflow — the system keeps running, and service can be carried out without a shutdown.
Replaces obsolete fans
The modular design allows fast, low-disruption replacement of many legacy belt-drive and AC fan types. Each module is identical and independently serviceable — future expansion or upgrades are simple.
Engineered on proven EC platforms
Our EC fans are designed as form-fit replacements for imported units, so a FanGrid retrofit drops straight into existing equipment.
| Item | Detail | Status |
|---|---|---|
| EC platforms | LWBE3G backward-curved EC plug fans · LWAE3G axial EC fans | Form-fit |
| Reference performance | LWBE3G560-188PT-01 delivers 16,039 m³/h — 1:1 form-fit for the ebm-papst R3G560 size class | Verified |
| Air performance | Tested to AMCA 210/211 methods; third-party reports available on request | On request |
| Electrical safety | ETL control listing 5022563 (UL 507 + CSA C22.2 No. 113) | Listed |
| Management systems | ISO 9001 / 14001 / 45001 | Certified |
| Lead time | Samples 1–3 days · production 15–30 days (vs 14–22 weeks typical for imports) | Fast |
Talk to us about your retrofit
Send us your current fan model, air volume, static pressure, voltage and control method — our engineers return a tailored FanGrid selection, energy-saving estimate and quotation.
All performance figures are indicative. Final selection is confirmed against the actual duty point (airflow / static pressure / voltage / control mode) and validated per project. Products are tested to AMCA 210/211 methods; third-party test reports available on request.