Fans by Fantech Electronic Catalogue

2016

Figure 1.6. - Obstruction at fan outlet

Don’t obstruct fan outlet.

When the discharge is too close to a wall the obstruction

generates noise and increases discharge losses.

Allow a gap of at least one fan diameter between fan outlet and

obstruction and fit a diffuser on the discharge.

1.0 AXIAL FANS (Cont.)

Figure 1.5. - Pressure recovery

Look for opportunities for static pressure recovery at axial exhaust fan outlets.

To determine the system resistance the discharge losses have

to be added before selecting the fan.

Discharge losses are highest in this arrangement and are

equivalent to one velocity head.

With a correctly designed discharge diffuser the pressure

recovery in the diffuser will reduce the system total pressure.

Included angle of diffuser to be 15° or less.

Discharge losses reduced substantially in this arrangement.

INSTALLATION DO’S AND DON’TS

P-4