Casing
The all-metal fan casing provides a long lasting and robust construction. The units have been constructed from a single sheet of steel, with both motor and axial impeller mounted within the length of the unit casing. All casing parts are heavy gauge mild steel sheet hot dip galvanised to BS EN ISO 1461 after fabrication, or pre-galvanised sheet steel, and drilled to BS EN ISO 13351, roll formed and welded for added strength and durability, . The fans are suitable for external mounting as standard.
Motors
AC Motors are to be foot mounted totally enclosed metric type to IP55, with sealed for life bearings, standard industrial paint finish and Class F insulation to EN 60034-5, suitable for operating temperatures up to +50°C. Motors are to be wired via a weatherproofed cable to an IP55 protected terminal box mounted on the outside of the unit casing
Impellers
Adjustable pitch increased twist aerofoil impellers are provided with blades made from high quality pressure die cast aluminium (LM6), natural finish. Impellers are factory set at an angle to provide maximum performance. The hubs are manufactured from die cast aluminium alloy (LM24). Assembled impellers are to be dynamically balanced to ISO 14694 Grade G6.3.
Control
Speed control shall be via Variable Frequency Drive.
Quality Management
Units are to be designed and manufactured with procedures as defined in BS EN ISO 9001. All Revolution SLC units are to be tested to ISO 5801 (airside performance) and BS 848 Part 2 (sound performance).