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is an Air Curtain?
Air Curtain is a device specifically designed to provide
a resistance to air flow through an opening, without
having any physical barrier there. Simply put, an Air
Curtain is a fan that is designed with an air outlet
that has a low turbulent air stream (high laminarity)
that can be angled towards the incoming air stream in
such a manner that the inflow of air can be prevented,
and thereby creates a seal. Different types of Air Curtains
can either be re-circulating types, or non re-circulating
Air Curtains emit air from a discharge grill on one
side of the door opening and collect the air on the
opposite side. It is then filtered, sometimes heated,
and then is returned to the discharge grille. These
units are essentially a modified heating system and
uses large amounts of air. They are usually associated
with high initial costs and high operating costs. Also,
because the air has to be filtered, the maintenance
costs are also quite high. The feature is that they
use low velocity air streams, which is desirable in
some commercial entrances. They are usually used in
supermarkets and store entrances.
Air Curtains are much more widely used. They are characterized
by much lower initial and operating costs. As they are
not re-using the air, it does not normally have to be
filtered and thereby they can be made essentially maintenance
free. They are also more effective, as the air streams
are narrower and of higher velocities. These are the
types that we manufacture.
Why use Air Curtains
Air Curtain are often used at interior doorways of industrial
and commercial facilities to seperate environments and
to proivide an invisible barrier for protection against
drafts, dust, dirt, odors and fumes.
Air Curtains are not designed for security purposes.
They are secondary doors that allow unristricted access
to the outside while conserving energy. Also, special
types of Air Curtains protect against flying insects,
dust and dirt.
of A Non-Recirculating Air Curtain
The Air Curtain
operates on a very simple law of physics. One force
will change direction if it is subjected to another
force. The force is air mass and the velocity at which
it travels. The outside wind has a certain mass and
a certain velocity, so does the air curtain stream.
If the Air Curtain force is equal and opposed to the
force form the draft through the door then the draft
is prevented from entering. If the draft is much stronger
than the Air Curtain it will break through and some
will enter. However, even in this circumstance, the
Air Curtain will prevent some of the outside wind from
entering at all times. If the Air Curtain is much stronger
than the draft some of the air will go outside. The
strength of the Air Curtain follows the formula: mass
times the velocity squared. Therefore an Air Curtain
that blows at twice the speed has four times the wind
stopping power at the same air volume.
can be mounted above, on one side, or on both sides
of a door. The most common way is to mount the Air Curtain
above the door. The feature with this is that the unit
is out of the way and is not likely to be damaged by,
for example, forklifts. It is also the most economical
way of installing an Air Curtain. The drawback is that
a small amount of air at the extreme bottom of the doorway
may enter due to the height of Air Curtain.
The Air Curtain
can also be mounted vertically on one side of the door.
There are some disadvantages to this however. If, for
example, a truck is parked in the door way then the
entire doorway is unprotected because the truck will
break the air stream. With the unit mounted on one side
of the door it is more likely to be damaged. Also, if
there is no equal force on the other side of the door
to stop the stream then the flow will follow the wall
for some distance and may disturb people who are standing
in the air stream.
way of mounting an Air Curtain is on both side of the
door with the air stream flowing towards each other.
This is the most comfortable way of installing an Air
Curtain as it eliminates the above drawbacks, except
of Motion of Air Curtains
Curtains creates an invisible barrier of air, generated
by high efficiency, direct driven centrifugal fans,
that compress the air inside the unit and release the
air through a directional nozzle with a pressure powerful
enough to stop strong winds.