Technical Foundation
What Is a Air Curtain?
An air curtain is a fan-powered unit mounted above a doorway that discharges a uniform, high-velocity sheet of air downward across the full opening, creating an aerodynamic barrier that resists the mixing of indoor and outdoor air without physically closing the door. Effectiveness depends on air velocity reaching the floor at sufficient strength to counteract cross-drafts and the pressure differential across the doorway (from stack effect, HVAC pressurization, or wind), commonly specified as a minimum terminal velocity at floor level, not just the discharge velocity at the unit.
Air curtains are sized to the full width of the doorway — undersized units leave gaps at the door edges where infiltration bypasses the air stream entirely — and to the doorway's traffic pattern and pressure conditions, with heated units adding a resistance or gas heating element to temper incoming cold air on entry doors in cold climates. Cold storage air curtains use a different design optimized for maintaining a temperature barrier on a freezer or cooler doorway, where the goal is retaining conditioned air rather than tempering outdoor infiltration.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Doorway Width Coverage | Unit width must match or exceed door opening | Undersized units leave uncovered edge gaps where air can bypass the barrier |
| Discharge Velocity | Air speed at the unit's outlet, e.g. 2,000+ FPM | Must be sufficient to reach the floor at adequate velocity to resist infiltration and cross-drafts |
| Mounting Style | Surface mount, recessed (flush ceiling) mount | Recessed mounting suits finished spaces where a surface-mounted unit would be visually or physically obstructive |
| Heating Option | Unheated, electric resistance, or gas-fired | Heated units temper incoming cold air on entry doors in cold climates, reducing HVAC load |
| Duty Rating | Light commercial, industrial/high-traffic, cold storage | Industrial and cold storage units are built for continuous duty and more demanding pressure/traffic conditions |
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Applications
Where Air Curtains Get Used
Air curtains are specified anywhere a doorway needs to stay functionally open for traffic while limiting the air exchange, temperature loss, or contamination that an open door would otherwise allow.
Retail Entrance Doors
Unheated or lightly heated air curtains maintaining comfort near frequently opened storefront entrances.
Loading Docks & Warehouse Doors
Heavy-duty industrial air curtains reducing conditioned air loss through large, frequently open dock doors.
Cold Storage & Refrigerated Warehousing
Cold storage-rated air curtains maintaining the temperature barrier at walk-in cooler and freezer doorways.
Restaurant & Food Service Kitchens
Air curtains at back-of-house doors reducing insect intrusion and conditioned air loss.
Manufacturing Facility Doorways
Industrial air curtains at production floor doors separating conditioned or filtered air from outside contamination.
Pharmaceutical & Cleanroom Environments
Air curtains supplementing pressure differential control at transition doorways to limit particulate migration.
FAQ
Air Curtains Questions, Answered
How do I size an air curtain for my doorway?
Match the air curtain's width to the full doorway opening width (not just the typical traffic path), and select a unit whose air velocity at floor level meets or exceeds the manufacturer's recommendation for the doorway's specific pressure conditions — factors like building stack effect, HVAC pressurization, and prevailing wind exposure at the door all affect how much velocity is actually needed to maintain an effective barrier.
Do I need a heated air curtain, or is unheated sufficient?
Heated air curtains temper incoming outside air as it's drawn across the barrier, which is worthwhile on entry doors in cold climates where unheated air curtain use would otherwise let noticeably cold air spill into the conditioned space during each door opening. For doors in mild climates, interior transition doorways, or purely infiltration-control applications (like separating a warehouse from a cold storage area), unheated units are usually adequate and less costly to operate.
Why is my air curtain not effectively blocking drafts even though it's running?
Common causes include an undersized unit that doesn't cover the full door width, insufficient discharge velocity for the doorway's actual pressure differential, or the unit being mounted too far back from the door plane so the air stream disperses before reaching the floor — verify the unit's rated velocity and coverage width against the specific doorway's conditions rather than assuming any air curtain will work at any door.
What's the difference between a standard air curtain and a cold storage air curtain?
Cold storage air curtains are specifically engineered to maintain a temperature separation at a walk-in cooler or freezer doorway, often with different airflow patterns and construction optimized for retaining cold conditioned air rather than tempering warmer outside air like a typical building entrance unit. Using a standard commercial air curtain on a freezer doorway may not maintain the barrier effectiveness needed to prevent temperature loss and frost buildup.
Can an air curtain replace a physical door entirely?
Air curtains are generally used alongside a door, running when the door is open, rather than as a full replacement for a physical barrier — they significantly reduce (but don't eliminate) air exchange, insect intrusion, and temperature loss during the time a door is open, and most codes and practical building operation still require a functioning physical door for security, full insulation, and code compliance.
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