Medium pressure axial fans and axial smoke extraction fans

/ Product catalogue / Smoke extraction / Axial smoke extraction fans / Medium pressure axial fans and axial smoke extraction fans

Complete solutions for axial fans

Installation example of axial fans on rooftop

Series

Fan installation into an air duct system

To ensure a uniform air flow the fan should be preceded by a straight duct section with a cross-section area equal to half of that of the fan. The length of the duct section should be 3 ÷ 4 D (D is the inner diameter of the fan). The length of the straight duct section downstream of the fan should be 1.5 ÷ 2 D. Reduction of the recommended duct length values results in a drop of the fan pressure and performance. To reduce noise and vibration use the VVGF flexible joints.

Fan installation with no upstream ducting

Axial fans without upstream ducting must be equipped with the VK-VO inlet cone to improve the air flow parameters.

Fan installation with no downstream ducting

If the axial fan is a terminal device of the ventilation system (i.e. there is no downstream ducting) the unit must be equipped with a diffuser to reduce the air flow velocity and the fan dynamic pressure. Reduction of the air discharge velocity results in a significant reduction of shock losses which are proportional to the square of velocity decrement.

The fan should not be equipped with a downstream contractor.

Installation near bends

To install the fan directly downstream of a bend (elbow) use a curved section with a large bending radius or an array of internal guide vanes.

Changing diameter installation

When changing from a smaller diameter to a larger one use a connector diffuser with the maximum opening angle of 12°.

Obstructed space installation

To ensure normal operation of the fan in an obstructed space make sure to provide for a sufficient distance between the inlet and outlet flanges and the floor, walls, bulky equipment and obstacles.

‹ › ×