If you’ve ever looked at a bain marie, hot cupboard, or hot holding servery specification and wondered “What does GN actually mean?” — you’re not alone.
GN sizes are one of the most common terms used in commercial catering equipment, yet they’re rarely explained properly. Understanding them makes it much easier to choose the right bain marie, bain marie hot cupboard, or hot holding equipment for your kitchen or food service area.
This guide explains Gastronorm (GN) sizes clearly and practically — the same way we explain them to customers at Nordstar, supplying commercial catering equipment across Northern Ireland and the Republic of Ireland.
What Are GN Sizes?
GN stands for Gastronorm, a European standard sizing system used throughout the commercial catering industry.
GN sizing defines the length and width of food pans and containers, ensuring compatibility across:
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Bain maries
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Bain marie hot cupboards
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Hot cupboards
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Hot holding counters
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Ovens and serveries
The key benefit is simple:
GN-sized pans fit GN-sized equipment — even when different manufacturers are involved.
This standardisation is why professional kitchens can mix and match equipment without layout or compatibility issues.
The Reference Size: GN 1/1
All GN sizes are based on a single reference size:
GN 1/1 = 530 × 325 mm
This is considered the full-size GN pan. Every other GN format is a fraction of this footprint, designed so multiple smaller pans can fit neatly into the same space.
Understanding GN 1/1 is essential when comparing bain maries, hot cupboards, or hot holding capacity.
Common GN Sizes Used in Commercial Kitchens
These are the GN formats you’ll see most often in commercial bain maries and hot holding equipment:
GN 1/1 (Full Size)
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530 × 325 mm
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Used in bain maries, hot cupboards, ovens, and counters
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Standard reference for capacity and layout planning
GN 1/2
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325 × 265 mm
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Two GN 1/2 pans equal one GN 1/1
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Ideal for splitting food types or reducing waste in hot holding
GN 1/3
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325 × 176 mm
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Very common in buffet service and bain maries
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Popular for sauces, sides, and front-of-house serving
GN 1/4
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265 × 162 mm
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Typically used for condiments or smaller portions
GN 2/3
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354 × 325 mm
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Less common, but useful in certain servery layouts
GN 2/1
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650 × 530 mm
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Mainly found in large ovens and bulk cooking environments
GN Pan Depth: Why It Matters for Hot Holding
GN sizing isn’t just about surface area — depth directly affects capacity and food quality.
Common GN pan depths include:
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20 mm
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40 mm
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65 mm
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100 mm
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150 mm
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200 mm
Deeper GN pans:
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Hold more food
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Take longer to heat evenly
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Can affect food quality in hot holding if overfilled
Shallower pans are often preferred in front-of-house bain maries, where presentation, access, and temperature consistency are more important than volume.
Why GN Sizes Matter When Buying Bain Maries & Hot Cupboards
Understanding GN sizes helps avoid costly mistakes when specifying hot holding equipment.
Compatibility
GN standards mean you’re not tied to one manufacturer. Existing GN pans can usually be reused when upgrading bain maries or hot cupboards.
Capacity Planning
Commercial bain maries and hot cupboards are often described by how many GN 1/1 pans they hold, making comparisons between models far more accurate.
Flexibility
A single GN 1/1 space can be configured as:
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1 × GN 1/1
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2 × GN 1/2
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3 × GN 1/3
This flexibility is crucial in busy catering environments where menus change regularly.
GN Sizes in Bain Maries and Hot Cupboards
In real-world terms:
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Bain maries are specified by GN pan capacity and layout
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Hot cupboards are described by GN shelf size and spacing
Typical examples include:
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“Holds 3 × GN 1/1 pans”
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“Accepts GN 1/1, 1/2 and 1/3 containers”
Once you understand GN sizing, these specifications provide clear, useful information rather than technical jargon.
Front-of-House vs Back-of-House GN Use
Front-of-house serveries
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Smaller GN sizes (1/3, 1/4)
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Shallower depths
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Focus on presentation and easy access
Back-of-house kitchens
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GN 1/1 pans
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Deeper containers
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Focus on batch holding and efficiency
Choosing the right GN size and depth helps maintain food quality throughout service.
Common GN Sizing Mistakes
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Assuming all GN depths will fit without checking shelf spacing
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Mixing non-GN pans with GN equipment
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Overfilling deep GN pans in hot holding
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Assuming deeper pans always give better performance
These small details can have a big impact on day-to-day kitchen efficiency.
Why the Gastronorm System Is Still Used Today
The Gastronorm system has lasted for decades because it works. It keeps commercial kitchens modular, equipment interchangeable, and layouts flexible — even as operations expand or change.
It’s one of the reasons modern bain maries, hot cupboards, and hot holding counters integrate so seamlessly into professional kitchens.
In Summary
GN sizes aren’t complicated — they’re just often poorly explained.
Once you understand:
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The GN 1/1 reference size
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How GN fractions work
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Why pan depth matters
you’ll find it much easier to choose the right bain marie, bain marie hot cupboard, or hot holding equipment with confidence.
If you need advice on GN layouts, capacity planning, or choosing hot holding equipment for your operation anywhere in Northern Ireland or across Ireland, understanding GN sizing is always the first step.
Click here to see all our range of bain marie hot cupboards, ready for dispatch the next day!
Check out our sister website for a broader range of catering equipment here www.jacksonscateringequipment.co.uk