Filter fan unit
Double-skin casing with staged particulate filtration and a fan selected for clean and final filter resistance.
Indoor Air Treatment
Engineered indoor-air treatment packages for filtration, recirculation and project-critical applications. Selection is based on the real system pressure budget and the exact documented filter package.
Recirculation module
Indoor recirculation package with service access, differential-pressure monitoring and project-specific controls.
HEPA / critical package
Final-stage high-efficiency filtration only when the exact filter class, housing sealing and test method are documented.
Preliminary model envelope
| Model | Airflow m³/h | Available static pressure Pa | Motor kW | Sound dB(A) @ 3 m | Typical scope |
|---|---|---|---|---|---|
| RF-IAU-2500 | 1,500–3,000 | 250–500 | 1.5–2.2 | 54 | Compact filter/fan package |
| RF-IAU-5000 | 3,000–6,500 | 300–650 | 3–5.5 | 60 | Medium-duty air-treatment package |
| RF-IAU-10000 | 6,000–12,000 | 400–800 | 7.5–15 | 68 | Large double-skin package |
| RF-IAU-20000 | 12,000–24,000 | 500–1,000 | 18.5–30 | 76 | Project-engineered modular package |
Filtration design inputs
| Item | Engineering requirement |
|---|---|
| Contaminant / particle target | Define by application; no health claim is assumed |
| Outdoor / return-air ratio | Required at minimum, normal and maximum duty |
| Filter stages | Prefilter, fine filter and optional final HEPA stage as documented |
| Filter classification | Requested ISO 16890 group or HEPA class only for the exact selected filter |
| Pressure drop | Clean, recommended change and final allowable ΔP for every stage |
| Casing / bypass | Housing leakage and filter bypass acceptance criteria |
| Monitoring | Differential-pressure gauge/switch and BMS alarm requirement |
| Maintenance | Access side, replacement clearance, drain and condensate provisions |
System pressure budget
| Pressure component | Selection basis |
|---|---|
| Ductwork and fittings | From coordinated system calculation |
| Coils / heat exchangers | At design airflow and fluid condition |
| Filters | All stages at clean and final resistance |
| Silencers and terminals | Include actual selected components |
| Control devices | Dampers, louvers and other accessories |
| Selection reserve | Project-defined; must not hide missing data |
ΔP system = ducts + coils + filters (clean/final) + silencers + terminals + control devices + reserve
Required project data
| Input | Required detail |
|---|---|
| Air duty | Airflow, external static pressure, operating hours and diversity |
| Air condition | Temperature, humidity, particle loading, corrosive or hazardous content |
| Electrical / controls | Supply, starter or VFD, sensors, BMS protocol and alarm logic |
| Construction | Indoor/outdoor location, casing, access, drainage, coating and sound limit |
| Evidence package | Exact filter datasheet, certificates, leakage/test requirement and acceptance criteria |
RAFAVENT
Engineering boundary: Values above are preliminary calculated, non-certified selection envelopes. Filter classification belongs only to the exact documented filter. RAFAVENT makes no infection-control, virus-removal, sterilization, UV-C dose, ionization or ozone claim without valid evidence for the exact component and complete system. UV-C or ionization, if requested, is project-specific and not standard.
Send the airflow, pressure budget, filter stages and acceptance criteria for a project-specific selection.