Purpose
EKN/DKN are fans for rectangular ducts in ventilation and air-conditioning systems. The sound-insulated EKNS/DKNS are chosen where low noise matters.
Design
The forward-curved impeller is mounted on an external-rotor motor and balanced to G2.5. The motor has thermal contacts and a low starting current and can be controlled over 100 % of its range by an auto-transformer or an electronic controller. The EKN/DKN casing is galvanised steel with 20 mm flanges; EKNS/DKNS use an aluminium profile frame with insulated panels.
When to choose
- a duct fan is needed for a rectangular duct;
- a sound-insulated casing is required — EKNS/DKNS;
- for comparison, see the backward-curved EK / DK series.
Technical data
| Sizes | EKN — 200–315, DKN — 200–450 |
|---|---|
| Motor | External rotor, 2, 4, 6 or 8 poles, thermal contacts (PTC on Ex versions); 100 % speed control by auto-transformer or electronic controller; low starting current |
| Materials | EKN/DKN — galvanised steel casing with 20 mm flanges; EKNS/DKNS — aluminium profile frame with reinforced polyamide corners, galvanised panels with glass-fibre insulation; steel or plastic impeller balanced to G2.5 |
| Mounting | Any position; standard 20 mm flanges |
| Airflow | approx. up to 9,000 m³/h (upper end of the selection charts) |
| Pressure | approx. up to 1,200 Pa |
| Power supply | EKN — 230 V 1~, DKN — 400 V 3~ |
Versions
- EKN — single-phase motor, DKN — three-phase
- EKNS / DKNS — sound-insulated casing
- Explosion-proof versions
Accessories
- JK volume-control damper
- SDK/SDKN silencers
- TFK bag-filter section
- EVK/EVKN flexible connections
- NE, RTD, RPE speed controllers
Manufacturer documentation is available on request — name the series in the enquiry form.