Air curtains that keep the cold in with the door open.
Air curtains for store entrances, cool room doors, freezer openings, docks and service windows, sized to the opening and set up on site.
- 2.0 m/s
- Jet speed at 150 mm above the floor, ASHRAE 90.1
- 20 degrees
- Minimum discharge angle towards the opening
- About 7 m
- Highest openings the industrial families cover
Nextage supplies and manages the install of air curtains across Australia for store entrances, cool room and freezer doors, loading docks and service windows. An air curtain blows a sheet of air across an opening that has to stay open, so cold air stays in and warm air stays out without a door. Each unit is sized to the width and height of the opening and set up on site, because a jet that does not reach the floor at the right speed and angle does little.
The problem
- Cool room doors propped open let cold air fall out across the floor.
- Entrance doors held open let the air conditioning out and the weather in.
- A curtain that was never set up after fitting runs all day and barely works.
What's included
- A measure of each opening: width, height and what passes through it
- The unit family and size that suits that opening
- Mounting, power and controls organised with the electrician
- Commissioning: jet speed and angle set on site with a meter
- Before and after photos
Public liability insurance. Certificate on request.
Range
Air curtain families
A dock door and a service window are different problems, so the family is chosen for the opening.
Entrance, unheated
Air only, for air conditioned shopfronts, mounted over the door.
Entrance, heated
Electric or hot water heating in the air path, for cold climate entrances.
Cool room doors
Higher jet speed, stepless speed control and adjustable vanes, the retail back of house workhorse.
Freezer openings
Higher pressure units, sometimes two with opposed jets, for sub zero doors.
Industrial and docks
Three phase families for roller shutters, dock doors and warehouse openings up to about 7 m high.
Insect control
Built for the jet speeds NSF/ANSI 37 asks for at food premises openings.
Service windows
Compact units for pass throughs and small back doors.
Recessed
Units that sit in the ceiling void with only the grille showing.
Stainless and washdown
For wet, salty or food processing areas.
Vertical
Jamb mounted units for openings with no head height above.
Specification
What sets one up properly
The figures an air curtain is judged against.
The service page shows the readings from a cool room door we measured, and what changed once the jet was set.
- Jet speed
- At least 2.0 m/s at 150 mm above the floor (ASHRAE 90.1)
- Angle
- Discharge at least 20 degrees towards the opening
- Test standards
- ANSI/AMCA 220 or ISO 27327-1
- Food premises
- NSF/ANSI 37 jet speeds for insect control
- Sizing
- To the opening width and mounting height
- Commissioning
- Speed and angle set on site with a meter
- Building code
- Not named in NCC J5D5; the certifier decides
Supply and install
Supplied, ordered and fitted for you.
No products to order, fixings to buy or trades to chase. One call, and it arrives fitted.
Tell us the site and roughly how many. We come back to you within 2 business days.
We measure
A site walk sets what goes where, and how many.
We order
The right product, size and quantity, delivered to site.
We organise
Access, inductions and timing around your trading hours.
Installed by licensed trades, photographed by us
Installed by licensed trades we manage, with before and after photos when it is done.
Often fitted in the same visit
A good fit
- Cool room and freezer doors that stay open while staff work
- Store entrances held open in trading hours
- Docks, roller shutters and service windows
- One door, or the same unit across a whole fleet
Not a fit
- An opening that can simply be kept shut with a self closing door
- Meeting NCC J5D5 on its own: air curtains are not named in it, so ask your certifier
Photos
An air curtain, measured
An air curtain over a cool room door, and the readings taken at that door with and without it running.
FAQ
About air curtains
What does an air curtain do?
It blows a sheet of air across an open doorway so cold air stays in and warm air stays out, without a door being shut. It suits openings that have to stay open while people and stock move through.
How do you size an air curtain?
To the width of the opening and the mounting height, so the jet still reaches the floor. ASHRAE 90.1 asks for at least 2.0 m/s at 150 mm above the floor with the discharge angled at least 20 degrees towards the opening.
Does an air curtain meet the NCC?
NCC J5D5 lists airlocks, self closing doors, rapid roller doors, revolving doors and the like. Air curtains are not named in it, so your certifier decides whether one is accepted.
Can one go on a freezer door?
Yes, with a higher pressure family built for sub zero openings, sometimes two units with opposed jets, and a plan for where the moisture goes.
Which brand do you fit?
The unit is chosen for the opening from the families on this page, and the proposal names the model.
Do you supply air curtains for warehouse and loading dock doors?
Yes. The industrial families cover roller shutters, dock doors and warehouse openings up to about 7 m high. They run on three phase power and the fixing is engineered for the opening, so each door is measured first.
Do air curtains keep flies out?
Only a unit built for it. NSF/ANSI 37, the standard for air curtains at food premises openings, sets a jet speed of about 8.13 m/s at a service door and 3.05 m/s at a customer entrance. A comfort unit runs well under that, so tell us if the brief came from a food safety audit or a pest report.
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Tell us the store and the openings. We'll measure them and come back to you.