Reversible Axial Fans
Product overview
RAFAVENT AXIAL FAN SUBFAMILY
Bidirectional axial-flow fans for supply and extract duties where the required airflow direction changes during normal operation. Selection is based on the duty point required in both directions, not on diameter alone.
Symmetrical or purpose-designed reversible blades provide comparable forward and reverse operation. Direction-specific tolerance must be confirmed at final selection.
Rolled steel casing with flanged ends, welded motor support, dynamically balanced impeller, external terminal box and protective coating selected for the environment.
Horizontal or vertical duct installation, wall opening or equipment integration subject to bearing, motor cooling, access and structural review.
Electrical basis: 230 V single-phase where shown and motor size permits; 400 V, 50 Hz, three-phase for the remaining standard selections. VFD operation is recommended when both operating directions or multiple duty points require commissioning adjustment.
Materials: standard casing in coated carbon steel; galvanised, stainless-steel and project-specific corrosion-protection options are subject to conveyed-air and environmental review. Aluminium or engineered composite blades may be selected by diameter and duty.
Each table represents a separate preliminary curve envelope for the stated diameter. Select continuous duty away from shut-off, stall and free-delivery limits. Actual curves depend on blade pitch, blade count, hub ratio, tip clearance, motor blockage and test arrangement. The 90% airflow row is an interpolated preliminary point between the 75% and 100% envelope references.
Specify forward and reverse airflow and pressure separately; do not assume identical system resistance in both directions.
For emergency smoke duty, no temperature class or EN 12101-3 claim applies unless the complete supplied fan has the relevant certification.
Sound values are preliminary free-field estimates at 3 m and exclude duct breakout, structure-borne vibration, reflections, silencers and background noise.
Motor power is a selection range, not a guaranteed installed rating. Final rating includes absorbed-power margin, air density, temperature and control method.
Standard published series: Ø400–1000 mm. RAFAVENT has axial manufacturing capability up to Ø1700 mm for custom engineered projects; custom sizes require a separate structural and aerodynamic review and are not represented by the standard curves above.
Final dimensions, connection details, materials, motor data and project drawings are issued for the selected configuration after engineering review.