Gastronorm sizes are the standardised container footprints defined by EN 631, the European standard governing professional kitchen equipment. The base module, GN 1/1, measures 530 × 325 mm. Every other GN code is either a fraction of that footprint (GN 1/2, GN 1/3, GN 2/3) or a multiple of it (GN 2/1). Critically, EN 631 governs external dimensions only. Internal volume varies by manufacturer depending on wall thickness and corner radii, so never assume litre capacity from footprint alone. Before ordering pans or racks, verify depth clearance and rim seating against your oven’s runner spacing.
530 × 325 mm is the GN 1/1 external footprint per EN 631 — the single dimension every other GN code derives from.
Table of Contents
- What are the standard gastronorm sizes?
- How does the GN system work in a professional kitchen?
- How to check oven compatibility before you buy GN pans
- Choosing the right GN pan depth, material and accessories
- Products from Thecommercialovenstore that match common oven specs
- Common mistakes when buying GN pans and how to avoid them
- Key takeaways
- Why getting GN compatibility right matters more than most buyers expect
- GN pans that fit your oven, ready to order from Thecommercialovenstore
- Useful standards and reference sources
What are the standard gastronorm sizes?
The table below maps each GN code to its external footprint per EN 631, typical orientation, and common kitchen use. These are fit dimensions — the numbers your oven aperture and runner spacing must accommodate.
| GN code | External footprint (mm) | Typical orientation | Common use |
|---|---|---|---|
| GN 2/1 | — | Landscape | Large batch cooking, banqueting |
| GN 1/1 | 530 × 325 | Landscape | Universal: roasting, steaming, baking |
| GN 2/3 | 355 × 325 | Portrait | Combi oven, bain marie, service counter |
| GN 1/2 | — | Portrait | Buffet service, prep, holding |
| GN 2/4 | 530 × 162 | Landscape (narrow) | Narrow inserts, garnish trays |
| GN 1/3 | — | Portrait | Salad bars, condiment stations |
| GN 1/4 | — | Portrait | Small portions, sauce inserts |
| GN 1/6 | — | Square-ish | Condiments, small sides |
| — | — | Portrait | Garnishes, tight buffet slots |
Less common sizes include GN 2/8 (324 × 132 mm), GN 1/12 (162 × 88 mm), GN 2/24 (132 × 108 mm) and GN 1/18 (108 × 88 mm) — mostly used in specialist buffet or display equipment.
The tiling logic is worth understanding. Two GN 1/2 pans fill one GN 1/1 aperture; three GN 1/3 pans do the same. That interchangeability is the whole point of the system.
One warning that trips up UK buyers: do not mix GN pans with US “hotel” pans. A US full-size pan measures approximately 508 × 305 mm — 22 mm narrower and 20 mm shorter than GN 1/1. That gap is enough to cause wobble in runners designed for GN, and in some cases the pan simply will not seat at all.
How does the GN system work in a professional kitchen?
The GN system’s real value is workflow continuity. A chef can move a GN 1/1 pan directly from a refrigerator shelf to a Rational or Unox combi oven runner to a service counter without transferring food. No re-plating, no extra handling, fewer cross-contamination points. That direct transfer is only possible because the external footprint is identical across all GN-compatible equipment.
Operationally, this matters most during peak service. Standardising on GN means your lids, racks and covers all fit regardless of which manufacturer made the pan. It also simplifies stock: one set of GN 1/1 lids covers every GN 1/1 pan in the kitchen, whatever its depth or material.
From a procurement standpoint, GN standardisation prevents vendor lock-in. If you buy GN-compatible ovens, you can source pans and racks from any compliant supplier. That flexibility matters when you are scaling a site or replacing worn accessories mid-service.
Rational and Unox both build their combi oven runner systems around GN 1/1 spacing, which is why specifying GN compatibility when purchasing any new oven is straightforward. The Rational i Combi Pro 10 GN1/1 accepts ten GN 1/1 pans simultaneously, with runner spacing designed to the EN 631 footprint.
Pro Tip: When purchasing multiple ovens for a new site, confirm that all units share the same runner spacing. Even within a single brand’s range, a 10-level GN 1/1 combi and a smaller 6-level model can have slightly different rail profiles. Standardising runner spacing across every oven from day one means your pans, grids and racks are interchangeable across the whole kitchen.
How to check oven compatibility before you buy GN pans
Ordering twenty GN 1/1 pans and discovering they rock on the runners is an expensive mistake. Run through these steps before committing to a bulk purchase.
- Measure the internal aperture. Record width × depth in millimetres. For GN 1/1 compatibility, the aperture must accommodate 530 × 325 mm plus any rim overhang.
- Check rail/runner spacing. Request the runner spacing drawing from your oven supplier. The runners must match the pan’s rim width; a few millimetres of mismatch causes the pan to tip under load.
- Verify depth clearance. Measure the distance between runners (shelf-to-shelf clearance) and compare it to your intended pan depth. A 100 mm pan in a 65 mm clearance slot will not close the door.
- Confirm rim seating and corner radius. Catering engineers consistently flag this: incorrect rim geometry causes wobble and uneven heat transfer. Ask the supplier for the rim resting profile and check it matches the oven’s support rail.
- Check door swing clearance. On pass-through or roll-in configurations, confirm the door opens fully with a loaded pan at the front runner.
Specs to request from your supplier: runner spacing drawing, internal aperture dimensions (W × D × H), maximum permitted pan depth per level, and the recommended GN depths for that specific oven model. Copy this list into your purchase order as a checklist.
Pro Tip: Cut a piece of cardboard to exactly 530 × 325 mm and slide it into the oven runners before ordering any pans. It costs nothing and immediately reveals whether the aperture, runner spacing and door clearance are correct for GN 1/1. Scale down to GN 2/3 (355 × 325 mm) if you are testing for smaller inserts.
Choosing the right GN pan depth, material and accessories
Depth is the decision most buyers underestimate. The footprint gets you into the oven; the depth determines what you can actually cook and how much you can hold.
| Depth | Approximate GN 1/1 capacity | Recommended use |
|---|---|---|
| 20 mm | low volume | Presentation, thin bakes, pizza bases |
| 40 mm | moderate volume | Baking, roasting, general prep |
| 65 mm | medium volume | Everyday cooking, steaming, batch prep |
| 100 mm | higher capacity | Bulk roasting, braising, holding |
| 150 mm | large capacity | Large batch storage, cook-chill |
| 200 mm | very large capacity | Bulk storage, transport |
The 65 mm depth is the most versatile everyday choice; 20–40 mm suits presentation and baking, while 150–200 mm is for bulk storage rather than oven use.
Material comparison:
- Stainless steel — durable, dishwasher-safe, handles high oven temperatures without warping. Slower to heat than aluminium, which suits holding and braising. Passivation (a light acid treatment) restores the protective oxide layer after heavy use or harsh cleaning chemicals.
- Aluminium — heats quickly and evenly, making it popular for baking and pastry. Lighter than stainless, but more prone to denting and not suitable for acidic foods over long periods.
- Non-stick coated — reduces food adhesion for delicate items like fish or egg dishes. Check the manufacturer’s maximum temperature rating before oven use; most coatings are rated to 260–280 °C, which suits most combi oven programmes.
Corner radius and rim lip geometry matter more than most buyers realise. A pan with a tighter corner radius sits differently on a runner than one with a wider radius, even when both are nominally GN 1/1. Internal dimensions vary by manufacturer because EN 631 only fixes the external footprint. For portion-controlled cooking, verify the actual internal volume with the supplier rather than estimating from the depth table above.
For cleaning: stainless steel pans tolerate commercial dishwashers well; aluminium pans should be hand-washed or run on a low-temperature programme to prevent oxidation; non-stick pans should never be scoured.
Products from Thecommercialovenstore that match common oven specs
These four SKUs from the Thecommercialovenstore catalogue illustrate how GN codes translate to real purchasing decisions:
- TG705 40mm Stainless Steel Pan GN 2/3 (355 × 325 mm, 40 mm depth) — fits the GN 2/3 runner slot in Rational and Unox combi ovens; suited to baking, roasting and bain marie service. Three of these tile into a GN 2/1 aperture.
- TG935 6 Eggs Pan GN 1/1 (530 × 325 mm) — a GN 1/1 pan with six egg-poaching cups; pairs with any GN 1/1 combi oven runner, including the Rational i Combi Classic 10 GN1/1. Depth is shallow, so confirm runner clearance before stacking.
- GRP806 Stainless Steel Grid GN 1/1 (530 × 325 mm) — a flat grid that sits on GN 1/1 runners; used for roasting, grilling and blast-chilling where airflow beneath the product matters.
- GRP715 Pollo Grid GN 2/3 (355 × 325 mm) — a chicken-roasting grid in the GN 2/3 footprint; fits the same runner slot as the TG705 pan and is designed for combi oven roasting programmes.
Contact Thecommercialovenstore for model-matching support if you need to confirm which depth or rim profile suits your specific oven configuration.
Common mistakes when buying GN pans and how to avoid them
Mixing GN and US hotel pans is the most frequent error in UK kitchens that have imported US equipment. The 22 mm footprint difference means hotel pans rock or drop through GN runners. Always verify the standard before ordering.
Ordering the wrong depth for your runner clearance is the second most common problem. A 100 mm pan in a 65 mm slot will prevent the oven door from closing. Check shelf-to-shelf clearance first, then choose depth.
Assuming internal volume from footprint leads to under-portioning or overflow. Because EN 631 only standardises external dimensions, two GN 1/1 pans at the same depth from different manufacturers can hold noticeably different volumes. Request the actual internal dimensions from the supplier.
Ignoring corner radius and rim geometry is the mistake catering engineers flag most often. A pan that technically fits the aperture but has a mismatched rim profile will wobble under load, creating uneven heating and a safety risk. Request a rim resting profile drawing and compare it to your oven’s runner cross-section.
Pro Tip: Order a single sample pan before committing to a full set. Seat it on the runners, load it to working weight, and check for movement. Five minutes of testing saves a bulk return.
Key takeaways
GN 1/1 (530 × 325 mm per EN 631) is the base module; every other GN code is a fraction or multiple of it, and depth, rim profile and material must all be verified against your specific oven runners before ordering.
| Point | Details |
|---|---|
| GN 1/1 is the base module | All GN codes derive from the 530 × 325 mm EN 631 footprint; confirm this against your oven aperture. |
| Depth determines use | The depth commonly used for everyday purposes is versatile; shallower depths are suited for baking and presentation. |
| EN 631 fixes external dimensions only | Internal volume varies by manufacturer; verify litre capacity where portion control matters. |
| Check rim and corner radius | Mismatched rim geometry causes wobble and uneven heat transfer on oven runners. |
| Thecommercialovenstore for model matching | SKUs including TG705 (GN 2/3) and GRP806 (GN 1/1) are available with model-matching support for Rational and Unox ovens. |
Why getting GN compatibility right matters more than most buyers expect
The GN system looks simple on paper — fractions of a rectangle, a handful of depths. In practice, the decisions that cause the most grief in professional kitchens are not about footprint at all. They are about rim geometry, runner profile, and the gap between what a spec sheet says and what actually seats securely under load.
Most articles on this topic stop at the size chart. What they underplay is that EN 631 is a dimensional standard, not a fit guarantee. Two pans that are both nominally GN 1/1 can behave very differently on the same set of runners if one has a wider rim flange or a tighter corner radius. That is not a manufacturing defect; it is just the reality of a standard that governs external footprint and nothing else.
The practical implication: the size chart gets you to the right postcode, but the rim drawing gets you to the right door. Before any bulk purchase, get the runner cross-section from your oven supplier and compare it to the pan’s rim profile. It takes one email and saves a return shipment.
GN pans that fit your oven, ready to order from Thecommercialovenstore
Getting the right GN pan for a Rational or Unox combi oven does not have to mean hours of cross-referencing spec sheets. Thecommercialovenstore stocks GN-compatible pans and grids — including the TG705 GN 2/3 stainless pan and the GRP806 GN 1/1 grid — alongside the ovens themselves, so you can confirm runner compatibility in a single conversation.
Flexible payment through iwocaPay means you can spread the cost of a full pan set or a new oven without tying up working capital. Whether you need a single sample pan to test fit or a complete accessory kit for a new Rational i Combi Pro 10 GN1/1, the team can match products to your exact oven model and runner specification. Visit Thecommercialovenstore to browse the catalogue or get in touch for a model-matching recommendation.
Useful standards and reference sources
- EN 631 / Gastronorm standard — Wikipedia: Gastronorm sizes: the primary reference for GN external dimensions and the tiling system.
- GN size chart with depths and capacities — Gastronorm.it: GN system standard sizes: a detailed chart covering all standard depths and approximate capacities.
- Catering engineer guidance on rim and corner radius — Cairn Catering Engineers: Gastronorm pan sizes: practical notes on fit, rim seating and the GN vs US hotel pan distinction.
- GN pan size guide with tiling examples — Hospitality Connect: GN pan size guide: tiling logic, depth recommendations and capacity guidance.
- Procurement and compatibility overview — Cooksmill: What size is a Gastronorm pan?: commentary on GN standardisation and procurement flexibility.
When using these references in procurement documentation, quote the exact external dimensions (e.g. “GN 1/1: 530 × 325 mm per EN 631”) and request runner spacing drawings from your supplier alongside any order. That combination of standard dimensions and actual runner geometry is what prevents fit failures before they happen.