5
6
H/2
P
H
Blocking Height (unit: m)
Blocking Height (unit: m)
Outdoor wind (unit: m/s)
Product is adjusted
to blowout toward
outside of the room.
Up to
10-20
º
C
Outdoor
wind
Outdoor
air
Ambient
air ingresses.
P: Pressure
H: Height
Indoor
Outdoor
warm air
Indoor
cool air
Cooling
Cool air
escapes
Curly wind
Cooling
Cooling
0
10
20
30
40
4
3
2
1
5
0
0
MK-50type
GK-35type(high power)
GK-35type(standard)
GK-30type
GK-25type
0
0
3
2
1
5
1
2
3
4
MK-50type
GK-35type(standard)
GK-30type
GK-25type
GK-35type
(high power)
The air flow can not hold off the air
naturally convecting in the room thus
allowing cool air to escape from it.
Therefore, the resultant air entering
from outside the room also allows any
heat to enter into the room.
An optimum magnitude exists of air
flow suitable to the effective blocking
travel down to the floor level around
the doorway.
If air conditioning, etc., allows temperature inside the
room and that outside the room to differ each other, the
pressure (P) around the doorway is distributed in such a
fashion as shown in the figure below. (The pressures are
one and the same in the central region (H/2), however,
further differ each other where the region is closer to
either the upper or the floor level.)
The difference in the pressures causes the wind to occur
thus allowing heat to enter into or escape from the room.
The wind is stronger as the difference in the
temperatures is significant; so is the quantity of heat
entering into or escaping from the room. An air curtain
spouts air flow to balance the pressures generated by the
difference in temperatures, thus preventing either the
ingressing or escaping of heat. Therefore, it is necessary
to select the model that suits the difference of
temperatures and the shut-out distance.
Note: When the air curtain is used for refrigerators or freezers, always install
it outside of them.
Taking into account the indoor/outdoor temperature difference
(holding off heat requirement)
Pressure distribution around the
doorway during summer season
<Strength of air flow>
Choosing a model taking into account
indoor/outdoor temperature difference
Too weak
Indoor/Outdoor Temperature Difference (K)
Key to Choosing an Optimum Model
Outdoor air may curve the air flow from the air curtain thus decline its performance. Such decline in performance
can be improved by the following methods.
The increased curly wind brings the cool
air out from the room. The resultant
increased air introduced from outside
the room therefore allows the more heat
to enter into the room. Also, more air
flow may be generated on the floor.
Moderate
Too strong
Jet flow is significantly bent allowing
ambient air to ingress from around floor
face.
The Product is adjusted to blowout
toward outside of the room thus
preventing ambient air from ingressing
into the room.
Too weak
Moderate
*The above figure is provided as a guide with the indoor temperature
assumed as 20
º
C
Choosing a model taking into account
The magnitude of outdoor wind
* Performance to oppose the
affect of outdoor wind, when
the Product is installed at its
maximum angle, is indicated.
* The above figure is posted
based on the values
calculated by applying the
average blowout velocity.
In order to prevent insects from breaking into the room, the air flow blown out from the air curtain must reach the
attainment point at a velocity at least that indicated in the table below. Choose an optimum model by consulting the
figure, posted on the page 11, denoting the average air velocity on the attainment point based on the air velocity
distribution.
Note: Insects such as flies which have high flying power may ingress into the room from the vicinity of the floor face where wind velocity is comparatively
low.
Assuredly install the Product. Otherwise, noises may resonate in harmony with surrounding walls thus augmenting
to an abnormally high level.
Note: It would be safe bet to choose, while sacrificing the blocking performance to some extent, a model whose capacity is slightly lower than that
indicated where noises may come to an issue.
* "A model which is ranked higher by one" means, e.g., Model GK-30 where installation height of 2.5m is indicated; GK-35 where 3.0m is indicated.
1
2
3
4
Applicable Insects
Minimally required wind velocity
(unit: m/s)
Winged ant, leaf beetles, mosquitoes, butterflies
more than 3-4
small moths, planthoppers, drosophilas
more than 4-5
dragonflies, houseflies
more than 5-6
large moths, large flies, large butterflies
more than 7-8
Taking into account the flying power of insects
Precautions when installing
Taking into account the strength of outdoor wind
(holding off outdoor wind requirement)
Please choose the model best suited to your applications primarily based on the shielding height (the height up to the Product installed), taking into account such
factors as temperature difference between inside and outside the room, impact of outdoor wind, insects flying power, or ambient noises. Selecting the optimum model
is the key to effective use of an air curtain.
Adjust the air outlet direction
Method
Concrete Means
Advantage
Precautions
Speed up the air velocity.
Adjust the angle of the Product when
mounting thus bringing the blowout
direction toward outside of the room.
Choose a model which is ranked
higher by one in shut-out distance
performance.
Effective where outdoor wind breezes
on a steady basis.
Effective where strong outdoor wind
breezes.
Direct the air outlet at right angle
when no outdoor wind is breezing.
Air flow on the floor and/or noises
may result.
The air flow coming out from the air curtain is curved and
then broken by lateral pressure. In order for an air curtain to
work more effectively, the generated air flow must reach
directly below it. If outdoor wind curves the air flow,
however, it is important to choose an air curtain of a model
suitable to the strength of the outdoor wind, while taking into
account the (1) angle, (2) width, and (3) air velocity.
Adjusting the angle of air outlet can optimize the angle of
the air flow thus improving its performance to oppose the
affect of outdoor wind. To widen the air flow or enhance its
velocity, a model can be chosen which is ranked higher by
one than that indicated in the figure to the right. A air flow
can also be widen by installing a multiple of Products to
improve the performance to oppose the affect of outdoor
wind.