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Air Curtain History
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Air Curtain Benefits
Air Curtain Usage
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FAQ
Selecting a System

 
Common Questions About Air Curtains

Are there any situations that will cause an Air Curtain not to perform properly?
 
Can the Air Curtains be Mounted Outside as well as Inside?
 
What Type of Maintenance Does an Air Curtain Require?
 
Can an Air Curtain that is Smaller than the Door Operate Efficiently?
 
How Far Above the Door Level Should the Air Curtain be Mounted?
 
How Far Away From the Wall can an Air Curtain be Mounted?
 
On an Overhead Installation, What Happens to the Air When it Hits the Floor?
 
What Happens When a Forklift or Other Vehicle Goes Through the Air Curtain Airflow?
 
Does an Air Curtain Improve the Circulation in a Building?
 
Why Do Air Curtains Have Directional Vanes?
 
How Long Does it Take to Mechanically Install an Air Curtain?
 
If the Air that Leaves the Nozzle Doesn't Have Much Velocity, What Might the Problem be?
 
Is the Voltage Important when Ordering?
 
What is an Automatic Door Switch?
 
Do Air Curtains Meet OSHA Requirements?
 
What is the Design Criteria for the Miniveil Air Curtain?

Are there any situations that will cause an Air Curtain not to perform properly? up.gif (487 bytes)

Yes, there are a few situations that will cause an Air Curtain not to perform as desired. The main reason is if there is an excessive negative pressure in the building. No Air Curtain can withstand excessive negative pressure. Some make up air has to be provided in these cases, in addition to an Air Curtain. The other situations arise from faulty installation of the Air Curtain. The Air Curtain will not perform properly if it is drawing outside air, or if it is not adjusted properly.

Can the Air Curtains be Mounted Outside as well as Inside? up.gif (487 bytes)

Special Air Curtains can be made so that they can be mounted outside and use inside air. (Please consult the factory when these are needed). The equipment can be mounted on either side of the door, but for best performance, the air that passes through the Air Curtain should come from the inside. The reason being the air stream is deflected to the inside. Air taken from the inside is heated, the outside air is cold. The purpose of the Air Curtain is to prevent cold air from entering, if you are putting cold air through the Air Curtain, you are defeating the purpose and the Air Curtain will not perform as well as it could.

What Type of Maintenance Does an Air Curtain Require? up.gif (487 bytes)

NONE: (Note: With a special unit where belt drives are used the belts should be checked every 2-5 years, depending on the number of starts that the unit has to do. In normal applications the fans are self cleaning and should not require any maintenance for at least 10 years. The exception is the belt drives. For severe use these may have to be re-greased every 2-10 years. (More bearings are damaged from over greasing than not enough!) If we supply the magnetic starters, these are of a long life with energy efficient coils, these may require new contact points after some 100,000 operations. In normal life, with some 1000 starts per year, this means a practically indefinite life.

Can an Air Curtain that is Smaller than the Door Operate Efficiently? up.gif (487 bytes)

Any Air Curtain that does not cover the entire door will not operate efficiently. In order for the Air Curtain to prevent cold air or insects from entering it must cover the entire area of the door opening.

How Far Above the Door Level Should the Air Curtain be Mounted? up.gif (487 bytes)

An Air Curtain should be mounted just above the door jamb. If there is an obstruction that prevents the Air Curtain from being mounted just above the door the Air Curtain has to be moved out 1" for every 3" that the unit is mounted above the door. This is so that the air stream will clear the door jamb and no turbulence is created.

How Far Away From the Wall can an Air Curtain be Mounted? up.gif (487 bytes)

There is really no limit. However, side panels have to be installed so that they, together with the Air Curtain, will form a vestibule. If you are uncertain, or have any questions, please contact the factory. We can usually, without charge, provide you with a design or, for a nominal charge, fabricate the brackets and panels required.

On an Overhead Installation, What Happens to the Air When it Hits the Floor? up.gif (487 bytes)

As the air, both from the Air Curtain and the entrained air from the inside and outside, hits the floor it will divide and send some air outside, and some air inside. If the Air Curtain air was laminar at the nozzle, and this is important for proper operation, then the majority of the air that goes outside is from the outside entrainment. This is why our Air Curtains are very carefully designed. Particularly at the nozzle and at the flow diverters (these are the connection pieces between the fans and the nozzle).

What Happens When a Forklift or Other Vehicle Goes Through the Air Curtain Airflow? up.gif (487 bytes)

The Air Curtain will still effectively seal the doorway, as the air stream goes around the vehicle and seals the opening. The only exception is when an Air Curtain is mounted vertically on one side only. The opposite side is not covered completely for the short time that the vehicle is in the actual doorway.

Does an Air Curtain Improve the Circulation in a Building? up.gif (487 bytes)

Yes, an Air Curtain improves the circulation and destratifies a building. Our Air Curtains are specifically designed to even enhance this, as they have the air intake from the top of the unit. For very high buildings, it is advantageous to have some type of duct work 6' below the ceiling, and allow the Air Curtain to draw from this warm air and push it down to the floor level, where it is needed. In some instances it may be beneficial to operate the Air Curtain all the time even though the doors may not be open. Our Air Curtains are designed to withstand this, as they are designed to be able to operate continuously.

Why Do Air Curtains Have Directional Vanes? up.gif (487 bytes)

The airstream has to be angled towards the draft, usually 15-20, for optimum performance. This is how they are set at the factory. For special applications, for example ovens or fly and insect control, this setting may have to be changed.

How Long Does it Take to Mechanically Install an Air Curtain? up.gif (487 bytes)

It obviously varies with different types of units and the different circumstances. On average it takes 2-3 hours for the first one and 1-2 hours for the second one. This is assuming that there are two workers installing the unit and a fork-lift or some other means of lifting the unit is available.

If the Air that Leaves the Nozzle Doesn't Have Much Velocity, What Might the Problem be? up.gif (487 bytes)

The most probable cause is that the fans are rotating backwards. When this happens the unit will still blow air but only a small amount. The way to fix this is to rotate any two wires. The fans will then rotate the right way. Another cause might be that the units are wired for the wrong voltage. If this is the case contact an electrician or the factory for help.

Is the Voltage Important when Ordering? up.gif (487 bytes)

Yes, the voltage is very important when ordering. Without knowing the voltage needed the wiring cannot be done and the proper motors will not be installed. Unless we know the voltage that will be used we cannot build the units.

What is an Automatic Door Switch? up.gif (487 bytes)

An automatic door switch is a switch that is mounted on the wall in such a fashion that it closes an electrical circuit when the door starts to open. By doing this the Air Curtain will start automatically. These switches are almost always used.

Do Air Curtains Meet OSHA Requirements? up.gif (487 bytes)

All Air Curtains we ship meet or exceed the OSHA requirements. The sound levels for even the most powerful units are some 10 dbA below the allowed limits (90 dbA for 8 hours exposure).

What is the Design Criteria for the Miniveil Air Curtain? up.gif (487 bytes)

Laminar air streams.
High efficiency.
Very low noise.
High degree of safety.
Ease of installation.
Long operational life, including the controls we supply.
Maintenance free (as much as possible).
2 year warranty on all workmanship, parts and controls, from date of manufacture, provided such goods have not been subject to misapplication, misuse, negligence or repairs by unauthorized persons. (We have the longest warranty, as far as we know, of any Air Curtain manufacturer).
Maximum flexibility and adaptability.
High quality and low cost give the best value for the customer.
All motors are standard, off the shelf, industrial quality. We do not use custom made motors as these are difficult to service and replace, if ever necessary.
 

Miniveil Air Systems
340 Ward St. Port Hope, ON
CANADA   L1A 4A6
Telephone: 1-905-885-4015
Fax: 1-905-885-6478
Email: info@miniveil.com