Air Curtain Sizing Calculator — India's Engineer-Grade Selection Tool
Enter your door width, mounting height and application, and get an instant recommendation: the correct air curtain model, required air velocity at the floor, airflow in CMH, motor power and the number of units needed. Built by Chronovex Industries (ISO 9001:2015, founded 2009) using the same selection standards our installation teams apply across India.
Size Your Air Curtain
How This Calculator Works
An air curtain must throw a continuous, uniform jet of air from the top of the doorway down to the floor with enough velocity left at floor level to resist the cross-draft. The required discharge velocity rises with mounting height, and the unit length must cover the full door width.
Target floor velocity by application:
- Comfort: 2.0 m/s — air-conditioning retention at entrances.
- Industrial: 2.5 m/s — dust, fume and temperature separation.
- Cold storage: 3.5 m/s — strong barrier against heavy cold-air spill.
- Fly control: 3.0 m/s — turbulent jet that insects cannot cross.
Standard commercial air curtains are made in 0.9 m, 1.2 m, 1.5 m and 2.0 m lengths; wider doors use multiple units mounted side by side.
Key Facts About Air Curtain Sizing
- The air curtain length must equal or exceed the door width — a unit shorter than the opening leaves an unsealed gap on one side.
- Discharge velocity must be high enough that roughly 2 to 3.5 m/s of air still reaches the floor; taller doors need stronger units.
- For doors above about 3.5 m high, an industrial down-blast or recirculating air curtain is recommended over a standard commercial unit.
- Cold storage and freezer doorways need the highest velocity class to stop heavy cold air from spilling out and forming frost.
- For fly and insect control in food and pharma units, a continuous high-turbulence jet across the full opening is what keeps insects out, not just airflow volume.
Frequently Asked Questions
How do I know which air curtain size I need?
Enter your door width and the height at which the unit will be mounted, then choose your application. The calculator matches your opening to a standard unit length and tells you how many units are needed and the airflow class required.
What is the difference between a commercial and an industrial air curtain?
Commercial units suit entrances up to about 3 to 3.5 m high for comfort and energy saving. Industrial units deliver higher velocity and airflow for tall factory gates, dock doors and cold rooms where a stronger air barrier is required.
Can one air curtain cover a wide gate?
Standard units come in 0.9, 1.2, 1.5 and 2.0 m lengths. For wider openings, multiple units are mounted side by side with no gap between them, and the calculator computes how many you need.
Do you install across India?
Yes. Chronovex manufactures in Noida, UP, and provides onsite installation and service across a 14-state pan-India network. Share your pincode for a site-specific quote.
What warranty do you provide?
Chronovex air curtains carry a standard manufacturer warranty on the motor and electricals. Exact warranty terms are confirmed with your quotation.
