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  Construction and Working of Exhaust Fan

Introduction to Exhaust Fan:

An exhaust fan is a fan that is employed to control the interior environment through venting out not wanted odours, moisture, particulates, smoke, and other contaminants that might be present in the air. Exhaust fans can as well be integrated into a heating and cooling system. General locations for exhaust fans involve bathrooms and kitchens, and these fans are generally very simple to install, thus they can be located in several other locations as well. The exhaust fans are as well termed fresh air fans. The major parts like motor, capacitor, cord are similar as that of table fans. The tests are as well mostly identical.

A typical use for an exhaust fan is in an environment such as a kitchen or a bathroom. These locations are apt to get filled with steam, and steam can help the development of mold that is not wanted. An exhaust fan can be employed to vent the warm, moist air to the outside, where it can disperse safely. Exhaust fans can as well vent cooking odors outside that is why they do not linger indoors, and while people cook smoky foods, the fan can assist keep the air in and around the kitchen clear.

For controlling the temperature, an exhaust fan can be employed in the hot months to push warm air outside, producing negative pressure in the house. This promotes air flow through drawing in air from the outside, and the outdoor air might be cooler, that contributing to cooling in the house. Bu using an exhaust fan can be an option to air conditioning, or a supplement to an air conditioning system.

These fans can as well helpful in garages and workshops to ventilate the space. Because these areas can occasionally obtain strong smells and people may work with potentially unsafe chemicals in them, exhaust fans can be employed for comfort and protection. An exhaust fan is particularly significant while people are working with things such as solvent that are not healthy or safe to inhale. Similarly, it is significant to vent fumes from paints, varnishes, and identical types of treatments. The technical data of the fan is expressed below.

 

Sl. No

 

Sweep

(mm)

 

Speed

(rpm)

 

Line current

 

Power input

(Watts)

 

Air delivery

(m3/h)

 

1

 

230

 

1350

 

0.29

 

45

 

700

 

2

 

300

 

1400

 

0.37

 

82

 

1900

 

3

 

380

 

1400

 

0.7

 

150

 

3610

 

Exhaust fans for Kitchen/Bathrooms:

Sl.No

Kitchen/Bathroom size(Length x width x height)

Recommended fan size(mm)

1

2.5 m x 2.5 m x 2.7 m

230

2

3.0 x 3.0 x 3.5

300

3

Area beyond this size

400

 

General Fault and Remedy:

Fault

Causes

Remedy

Noise

It is because of worn out bearings and absence of lubricating oil or grease.

Humming or induction moise is because of non-uniform air gap owing to the displacement of rotor.

The      bearings    have to be replaced if worn out; otherwise lubricate with proper lubricant.

Dismantle and reassemble correctly.

Low speed

It is because of defective or leaky capacitor.

Low voltage applied

Change the capacitor with one of the same value and voltage.

Test the voltage and adjust if possible.

Jamming of rotor

It is because of misalignment.

Dismantle and assemble appropriately           after          proper lubrication.

Not starting

Low applied voltage

Supply failure Open in winding. Condenser open or short. Open in regulator resistor or switch.

Test the voltage and adjust if possible.

Test the supply points at switch, regulator ceiling rose and the terminal of the fan.

Test for the continuity of auxiliary and main winding.

Test the capacitor with a

Megger.

Test for open or loose contact in the resistor or contacts.

 

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