Ventilation Fan for Generator and Engine Rooms

The process

Engine rooms need ventilation sized for the radiator heat and the combustion air, with silencers on the intake and exhaust openings where the site has noise limits.

The gas at the fan

Clean ambient air at site temperature. Density is close to standard and the fan is selected on efficiency and noise with no allowance for dust or corrosion.

Selection for this duty

Blade form	Backward curved or aerofoil for the best efficiency on clean gas
Material of construction	Mild steel
Drive and bearings	Direct coupled or belt driven; belt drive where the duty point may need tuning at site
Density at the fan	At about 35°C the gas density is close to 1.15 kg/m³, 95% of standard air. Pressure developed and power drawn fall in the same ratio, so the selection is made at this density and the motor is checked at cold start.

Moves air through a plant or building for fresh air supply, heat removal and fume dilution where the system is ducted. Low pressure, long hours, so efficiency and noise set the selection. Client-stated blade types for the Ventilation Fan in general: Backward inclined and forward curved.

Industries

Other fans in generator and engine rooms

Ventilation Fan in other processes

Services on this fan

Information needed to select or quote

1. Duty point. Volume flow and static pressure at the fan inlet, with the gas density and temperature or the conditions to derive it.
2. Operating conditions. Site altitude, normal operating temperature and continuous or intermittent duty.
3. Gas stream. Dust loading and particle size, corrosive species, moisture, upset temperature and any tendency of the material to deposit on the impeller.
4. Mechanical. Rotation viewed from the drive end, discharge orientation and motor power.