Hundreds of people enter a supermarket every day. So many consumers shop products and move frequently in the market and every time the door remains open. Entering a supermarket filled with people creates an anxious atmosphere in summer as well as winter. When the door is open, the interior air moves outside and the hot air that is outside gets inside. Apart from the hot air, dust and airborne particles are also circulated inside the establishment. These contaminants cause various diseases and infections
A cost-effective solution for this issue is an air curtain or air door. They work on a basic principle. A stream of high-velocity and temperature controlled air flow in a downward stream across an opening. For supermarkets, it is highly essential to maintain the temperature, especially to preserve the quality of fresh food and other perishable items.
Types of Air Curtain:
Basically, there are two types of air curtains, one is recirculating and the other one is non-recirculating. Recirculating curtains are mostly used in store and supermarket entrances due to their low-velocity air streams. A discharge grill is installed on one side of the entrance that emits air, which is then collected on the other side of the entrance where it is filtered. These air curtains have high initial and operating costs. They also tend to have high maintenance costs due to the filtration and sometimes heating processes.
Non-recirculating air curtains have lower operating & initial costs and preferred widely than recirculating airflow curtains. They also have no maintenance cost, since the air they emit is not filtered. They are more efficient and highly effective due to their high-velocity of air streams.
Important Factors to consider:
Before selecting an air curtain, there are certain important factors that you should consider. Some of these include,
-The entry/exit door width.
-The installation height between the floor and the discharge diffuser.
-The building's interior decor, power and voltage availability.
-Door characteristics like, manual, automatic, revolving, or always open.
-The number of doors within the same area of a building.
-Whether or not the building has stores that are connected by stairs or escalators, internal and external pressure differences, and the building's location to determine the required protection level.