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An air curtain or air door is a device used to prevent air or contaminants from moving from one open space to another. The most common use is a downward-facing blower fan mounted over an entrance to a building, or an opening between two spaces conditioned at different temperatures.
- The air curtain is NOT an air conditioner
An air curtain is a powerful fan that creates an invisible high speed air barrier over the entrance to isolate the interior and exterior air environment and maintain temperature separation. It DOESN'T raise or lower the temperature of the air that goes through.
The air curtain generates a continuous broad stream of air circulated across a doorway of a conditioned space. It reduces penetration of insects and unconditioned air into a conditioned space by forcing an air stream over the entire entrance. The air stream layer moves with a velocity and an angle such that any air that tries to penetrate the curtain is entrained.
There are several factors to consider when choosing an air curtain: Width, Max Mounting Height, Power Type & Usage, Airflow and finnally Noise level.
This is the first thing you need to check before anything else when shopping for an air curtain. Keep in mind that the air curtain should be wide enough to cover the entire entrance.
Most brands offer standard 36" models for residential use, wider models (up to 72") for commercial use and even wider models (up to 144") for industrial use.
Most residential and commercial air curtain models have a Max Mounting Height limit of 8 feet, which is enough for most standard doors. But if your entrance is extra tall, you should consider choosing a more powerful model with stronger airflow.
Most residential and commercial air curtain models are designed to meet the general power specs in the U.S., which is 120 V / 60 Hz. Industrial models require higher voltage and multiple power phases. Make sure that you have an appropriate power source nearby for the air curtain to plug in.
The higher the better. Stronger airflow is more efficient in blocking flying insects from entering and preventing conditioned air from escaping, thus save more money than using a model with weak airflow.
The noise generated by the fast-spinning fans inside the air curtain sometimes can be annoying, so we would want it as low as possible. Noise level of 55 dB and below are considered as quiet.