Purpose
JFUO and JFRO are designed for jet-fan ventilation of underground and enclosed car parks. In normal operation they dilute and remove exhaust fumes based on CO sensors; in a fire they push smoke towards the exhaust shafts and keep a smoke-free zone for evacuation and fire-fighting. A jet-fan system can create "virtual" smoke zones without smoke curtains or ducts.
Design
The casing is a single oval-section silencer, so the fan takes minimum height and needs no separate attenuators. The cast aluminium impeller has blades with adjustable pitch, set at standstill to the required thrust.
A key feature for operators is service access: the motor–impeller unit slides out of the casing, so maintenance does not require taking the fan down from the slab. The design is patented by the manufacturer.
When to choose JFUO / JFRO
- headroom under beams is limited, but a centrifugal JFC is not needed;
- low noise matters, as in residential complexes — the long L casing reduces sound levels;
- flow reversal is required — choose JFRO.
For more thrust per fan, consider the round JFUC / JFRC; for minimum height, the centrifugal JFC.
Technical data
| Thrust | 24–68 N |
|---|---|
| Airflow | 2,448–9,504 m³/h |
| Temperature rating | F300 (300 °C, 120 min), F400 (400 °C, 120 min) |
| Sizes | 300, 370; casing L — 2,250 mm, S — 1,200 mm |
| Motor | Two-speed, 2,880 / 1,440 rpm, IP55; 1.1/0.25 to 2.2/0.5 kW (300 °C version) |
| Materials | Casing — Sendzimir-galvanised steel, powder coating optional; impeller — cast aluminium alloy |
| Mounting | Under the slab, horizontal; detachable ceiling bracket included |
| Thrust JFUO | 28/7 N (size 300) to 68/17 N (370), high/low speed |
| Thrust JFRO | 24/6 N (300) to 53/13 N (370) |
| Casing height × width | 343 × 530 mm (300) — 415 × 600 mm (370) |
| Sound pressure level | 64/48 — 78/61 dB(A) at 3 m, 45° |
| Weight | 56–108 kg |
| Impeller balancing | G6.3 to ISO 1940-1 |
| Certification | EN 12101-3; CE under Regulation (EU) 305/2011; MPA Braunschweig supervision |
Versions
- JFUO — uni-directional: inlet guard, discharge guide vanes
- JFRO — fully reversible: guide vanes on both ends
- L — long 2,250 mm casing (lower noise), S — short 1,200 mm casing
- Twin-motor, twin-impeller duty/standby version on request
Accessories
- Detachable ceiling bracket (included)
- Isolator switch, including a high-temperature type tested with the fan to EN 12101-3
- Powder coating in a colour of your choice
