What is an Air Curtain?

An air curtain is an innovative device that helps maintain a comfortable environment within buildings by creating an invisible barrier over a doorway or entrance. This invisible air barrier effectively separates the indoor air from the outside air, preventing unwanted exchange and contributing to significant energy savings. Air curtains are essential for energy-efficient buildings.

How Do Air Curtains Work?

Air curtains work by producing a controlled stream of air that is directed downward over the opening. This high-velocity air stream creates an invisible barrier between the inside and outside environments. By doing so, air curtains prevent infiltration of unconditioned air, dust, and even flying insects into the interior space. The use of air curtains is a practical solution for maintaining interior climate control.

Types of Air Curtains: Heated vs. Ambient

There are two main types of air curtains: heated air curtains and ambient air curtains. A heated air curtain includes a heating element that warms the air as it passes through, providing additional comfort by supplying warm air at the entrance. In contrast, an ambient air curtain does not heat the air, and the air exits at room temperature.

Both types of air curtains are effective at creating an invisible barrier and preventing the mixing of indoor and outdoor air. The choice between a heated or ambient air curtain depends on the specific requirements of the building and the desired level of comfort.

Advantages of Using Air Curtains

Installing an air curtain offers numerous benefits for commercial and industrial settings:

• Energy Savings: By reducing the loss of conditioned air, air curtains contribute to significant energy savings on heating and cooling costs.
• Comfort: They maintain a consistent indoor temperature, preventing drafts and ensuring comfort for occupants.
• Pest Control: Air curtains act as a barrier to flying insects, keeping them from entering the building.
• Air Quality: They prevent dust, fumes, and pollutants from infiltrating indoor spaces.
• Unobstructed Entry: Unlike physical doors, air curtains allow for easy access while maintaining environmental separation.

Applications of Air Curtains

Air curtains are versatile and can be used in a variety of settings:

• Retail Stores and Restaurants: To maintain interior climate and enhance customer comfort.
• Warehouses and Loading Bays: To prevent the loss of conditioned air and improve energy efficiency.
• Cold Storage Facilities: To minimise temperature fluctuations and reduce energy consumption.
• Hospitals and Clean Rooms: To maintain sterile environments by preventing contamination.

Air curtains are often installed over a doorway to prevent the loss of conditioned air when the door is open.

Cold stores

Ambient air curtains also provide utility for cold stores; where the ability to keep the door sealed while people and goods enter and exit are proven to save significantly on cooling costs.

Large cold stores use secondary methods after the door to preserve as much heat as possible; secondary doors impair movement and slow down transportation; plastic films are unsafe, inefficient and unhygienic. Ambient air curtains provide the best of both with seamless movement and efficient sealing.

Smaller cold stores may also make use of air curtains, as air curtains are a much simpler and smaller addition than other secondary sealing methods.

Air Curtains vs. Air Doors

An air curtain is sometimes referred to as an air door or Over door heater. Both terms describe the same technology that creates a protective barrier over an entrance or opening. The air curtain or air door plays a crucial role in controlling the exchange of air through the doorway.

Understanding Air Velocity and Performance

The effectiveness of an air curtain depends on the velocity of the air stream. A properly designed air curtain must generate sufficient air speed to reach the floor and create a seal against the pressure of the outside air. The correct velocity ensures that the air curtain performs optimally.

By installing an air curtain, businesses can enjoy enhanced comfort, improved energy efficiency, and better control over their indoor environments. Whether opting for a heated or ambient model, an air curtain serves as a cost-effective solution to maintain desired temperatures and keep out unwanted elements. The use of air curtains is a smart investment for long-term energy savings.