Specifications

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a compression stud device. This design permits the fan to be used either as a stationary or an
oscillating model.
Supply cord: A 3 core, flexible sheathed conductor of length about 2 m is used which has an
earthing conductor along with other two conductors. A cord grip is also inserted at the entrance
point of cord into the body.
Fan regulator: It is built within the table fan. There are so many types of regulators i) Resistance
wire type ii) Choke or inductor type iii) Capacitor type and iv) electronic type. Generally coiled
resistance type regulator is used in table fan.
Working of Table fan: The working of fan is that they do not actually reduce the temperature of
the room but due the circulation and wind motion they result in surface cooling and give a breezy
feeling. Electricity is used to empower the fan motors and due to the scientific design of fan
blades we get the breeze, a man made phenomenon, similar to wind creation. The fan blades
create a draught and the warmer air goes in. When that air is pushed away with a force, we get
better air circulation.
Fig.13.6 - Exhaust fan
13.6 Exhaust Fan :
An exhaust fan is a fan which is used to control the interior
environment by venting out unwanted odors, particulates,
smoke, moisture, and other contaminants which may be
present in the air. Exhaust fans can also be integrated into a
heating and cooling system. Common locations for exhaust
fans include bathrooms and kitchens, and these fans are
usually very easy to install, so they can be situated in many
other locations as well. The exhaust fans are also called fresh
air fans. The main parts such as motor, capacitor, cord are
same as that of table fans. The tests are also mostly identical.
The typical exhaust fan is shown in Fig.13.6
A classic use for an exhaust fan is in an environment like a kitchen or a bathroom. These
locations tend to get filled with steam, and steam can promote the development of mold, which
is not desirable. An exhaust fan can be used to vent the warm, moist air to the outside, where it
can disperse harmlessly. Exhaust fans can also vent cooking odors outside so that they do not
linger indoors, and when people cook smoky foods, the fan can help keep the air in and around
the kitchen clear.
For temperature control, an exhaust fan can be used in the hot months to push warm air
outside, creating negative pressure inside the house. This promotes air flow by drawing in air
from the outside, and the outdoor air may be cooler, contributing to cooling in the house. Using
an exhaust fan can be an alternative to air conditioning, or a supplement to an air conditioning
system.
These fans can also be useful in garages and workshops to ventilate the space. Since
these areas can sometimes acquire strong smells and people may work with potentially