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Exhaust fan is a mechanical ventilation device that helps to
draw out stale and impure air from your home and bring in fresh
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fans are typically ducted to the exteriors of your house, through which bad
indoor air can effectively be removed from your living space.
Pollutants
such as pesticides, harmful gases, smoke, pet dander, lead,
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into indoor air due to daily activities such as cooking, smoking, burning fuel,
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also release excess moisture in the air and make indoor air extremely humid. If
not ventilated adequately, these added pollutants and increased moisture levels
can decrease the quality of indoor air greatly, thereby leading to various
problems such as:
Health problems including asthma, allergies, nose
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breathing disorders. In fact, according to the Environmental Protection Agency,
a large percentage of the over 20 million annual asthma cases in the US alone
can be attributed to bad indoor air quality.
- Split, warped and rotted
furniture due to excess humidity.
- Cracked and peeling paint on the walls.
- Formation of
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severe health problems.
Wall exhaust fans are very effective at any
building ventilation. Without proper ventilation, the air inside your home can
get filled with harmful contaminants and disease causing
pathogens.
Exhaust ventilators are classified into various types, mainly
depending on the type of mount and the location where you need to install the
fans. The different types are:
1. Ceiling Mounted Exhaust Fans: As the
name suggests, ceiling exhaust fans are those which are installed in the
ceiling. Such fans expel stale air from your home upwards through the roof. The
fan is connected to ducting, which is exhausted outside the home via an external
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2.
Inline Exhaust Fans: Unlike ceiling exhaust fans that are installed directly
into the ceiling, inline exhaust fans are typically mounted in-between ducting,
hence the name inline fan. For instance, if you wanted to ventilate an area that
did not have clearance or space for a ceiling mount fan, you would make use of
inline exhaust fans to ventilate such areas. The exhaust fan would be placed in
between the ductwork and the stale air would travel through the ducts and
ultimately be expelled from your home. Since inline fans are not mounted
directly to the ceiling, they are very quiet. When installing an inline fan, to
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at least eight feet long from the intake port on the ceiling to the inline fan.
Inline exhaust fans are ideal for exhausting areas or rooms where you
cannot, or do not wish to install the exhaust fan directly. Since these types of
exhaust fans are mounted in remote areas, they are also referred to as remote
mounted exhaust fans. Inline exhaust fans can either be single-port (exhausting
from a single area) or multi-port (exhausting from multiple areas).
3.
Wall Mounted Exhaust Fans: These exhaust fans are installed on walls. Since they
are installed on exterior walls of the home and not on interior walls, the stale
air has a direct route to the outside of your home and thus no duct work is
required in installing these exhaust fans.
4. Combination Exhaust Fans:
Exhaust fans are also available as combination units. You have the choice of a
fan-light combination where the exhaust fan provides illumination as well, or
heat-fan-light combination wherein you get a heater, light and ventilating fan
all in a single device.
5. Exterior Remote Mounted Exhaust Fans: While
most other exhaust fans are installed inside your home and push stale air out,
exterior remote mounted fans are installed outside your home and pull out stale
indoor air instead of pushing it out. The main benefit of these exhaust fans is
that regardless of however noisy they
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home.
6. Kitchen Range Exhaust Fans: These fans are mounted inside the
range hood over your kitchen stove. Such fans not only help to rid your kitchen
of stale air but also help to expel bad odors and reduce moisture levels in your
cooking area.
These several types of exhaust fans can be used for
complete ventilation of your bilding including intermittent local ventilation
for baths, kitchens, dryer rooms; continuous whole building ventilation, and for
exhausting hard-to-air spaces such as crawl spaces, attics, and
basements.
Thus, by using exhaust fans to ventilate your building
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avoid of all these problems.
When sizing an exhaust fan that does not
open directly to the outside but is ducted, it is important to ensure that the
exhaust fan has the capability to move stale air throughout the duct and
ultimately to the outside. Here, we first need to understand what static
pressure and equivalent duct length is.
Inside every duct, there is a
constant pressure being exerted at any point from all directions. When an
exhaust fan moves air through the duct, the air counters resistance from this
pressure which is known as static pressure. Thus, an exhaust fan has to have the
ability to overcome the static pressure in a duct so as to effectively duct
stale air to the outside of your home. This can be done by calculating the
equivalent duct length of any duct.
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