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/ Product catalogue / Smoke extraction / Axial smoke extraction fans / Medium pressure axial fans and 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
VPVO
Medium pressure axial fans with air capacity up to 120 000 m³/h
VPVO 1400/1600
Axial pressurization fans. Standard sizes 1400 and 1600 mm
VDO
Axial smoke extraction fans with air capacity up to 114 000 m³/h
VDO 1400/1600
Axial smoke extraction fans. Standard sizes 1400 and 1600 mm
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.