Air curtains are devices that are aerodynamically designed
to provide strong airflow resistance through entrances or openings that have no
physical barrier. A curtain creates a door seal that prevents external inflow
of air by positioning its air-outlet, which has a low turbulent air stream,
against the incoming air stream.
Air curtains, also known as air doors, are ideally placed
above or at the side of the doorways of commercial buildings such as offices,
restaurants, shops. These devices can cover up to 6m doors where they release
warm air from top to bottom in order to maintain warm, conditioned air within
the building. They prevent the exchange of cold and hot air and get rid of
draft. During summer, these devices effectively maintain cool air within the
building by preventing the entry of warm external air, thus providing a
comfortable environment.
These curtains keep the environment clean by creating a
strong turbulence that repels flying insects and pollutants such as dust,
pollen, and traffic fumes from getting into the business premise. If you are
running a restaurant business, you would most certainly want to keep away these
insects.
The curtains effectively save energy since they do not allow
inflow of external air or outflow of internal air by creating an
"invisible door" barrier. Businesses can therefore save on hefty
electricity bills using these high-tech devices especially in cases where a
well-sealed door cannot be put in place since it would hinder the smooth flow
of foot traffic in and out of the premise.
Recirculating curtains have two grills, discharge and
receiving grills that can be placed on opposite sides of the door entrance. The
discharge grill releases air, which is then collected by the receiving grill.
The air is then filtered, and in some cases heated and then returned to the
discharge grill to be reused again in a continuous way. The system uses large
amounts of air, which is filtered separately. As such, this design has high
initial operating, and maintenance costs. The advantage of re-circulating air
curtains is that they give low velocity air flows that are desirable in certain
businesses such as supermarkets and stores.
The most widely used curtain design is the non
re-circulating system. These designs have lower initial operating costs, with
nearly no maintenance costs since the air used is not filtered. The system does
not reuse air and as such, there is no continuous airflow. The air pulled into
the system goes into the fan housing where it is accelerated and then equally
dispersed through the discharge nozzle's entire length. The air streams
produced by this system are narrower and have high velocities, which make them
very efficient.
The first benefit of installing a curtain in your business
premise is that it saves energy. This is because the system reduces the costs
incurred from a heating and air-conditioning system by controlling air
transfer. Another benefit is that it allows safe and faster traffic flow into
the business premise due to open entrances. The types of curtains also increase
employee and customer comfort within the business premise through the
elimination of draughts. Finally, curtains prevent the entry of insects and
contaminants into the building.
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