Two wire shelves with identical width and depth can behave very differently once installed and loaded. Wire spacing, frame design, support positions, fixings and surface finish all influence how a shelf performs in its intended application.
When choosing wire shelves for refrigeration or retail, start with the products they will carry, the equipment they will fit and the way they will be used. These details provide the basis for a design that can be quoted, manufactured and checked on a sample.
1. Define the application: what will the shelf carry?
Drinks bottles, cardboard packs and small containers need different types of support. Product weight matters, but so do the size and shape of the base, the display arrangement and how frequently staff replenish the shelf.
Before starting the design, establish:
- Which products will be displayed, and what are their dimensions?
- What is the maximum required load per shelf?
- Will the load cover the whole surface or be concentrated in specific areas?
- Will the shelf be horizontal or inclined?
- Are front stops, dividers or a price label holder required?
These details help determine whether the proposed wire layout will provide suitable support and convenient handling. The overall shelf dimensions alone cannot answer that question.
2. Wire shelf load capacity: assess the complete assembly
Wire diameter affects stiffness, but it does not determine load capacity on its own. The span between supports, perimeter frame, reinforcement, welded joints and attachment to the cabinet or display must also be considered.
A load specification should describe both the weight and its distribution. Evenly spaced packs load a shelf differently from heavy products concentrated in the centre or along the front edge.
For example, “30 kg per shelf” leaves several questions unanswered. Is the load uniformly distributed? Which brackets support the shelf? What deflection is acceptable? This is an example of information to clarify, not a load rating for a particular SHELMO product.
The required capacity should be verified for the specified design and support conditions. Brackets and fixings also need to be included in the assessment because they form part of the load-bearing assembly.
3. Wire spacing: product stability and everyday handling
Choose wire spacing with the smallest product base in mind. Excessive gaps may allow small packs to tilt or make products difficult to slide into position during replenishment.
The drawing should clearly state whether the spacing is measured between wire centres or as the clear gap between adjacent wires. These are different dimensions, even when the numerical value is the same.
The direction of the wires relative to product movement also matters. Check the arrangement using actual packs, particularly those with small feet, shaped bases or flexible packaging.
Closer spacing increases material use and may affect manufacturing cost. Select it to suit the intended product range and required stiffness.
The geometry and wire spacing defined in the drawing guide how the component is manufactured.
4. Refrigeration shelves: account for airflow
Inside refrigerated equipment, the shelf is part of a wider system. Its design and the arrangement of products must be compatible with the equipment manufacturer’s airflow requirements.
An open wire surface leaves gaps between the wires, but it does not guarantee uniform cooling. Packaging, additional shelf liners, excessive stocking or blocked supply and return air openings can restrict circulation.
When changing a shelf, check its position, depth and interaction with the cabinet’s other components. Maintain the clearances and loading arrangements specified for the particular equipment model.
5. Material and finish: match the operating conditions
Moisture, operating temperature, cleaning methods and contact with packaging all influence the choice of material and finish. Colour is only one part of the specification.
Depending on the project, the options to assess include:
- Carbon steel with a polyethylene coating: check the requirements for temperature, cleaning, resistance to damage and coating thickness.
- Powder-coated steel: allows the colour to be matched to the retail equipment. The specific coating system must also suit the operating environment.
- Stainless steel: select the grade and surface finish according to the conditions of use and the cleaning agents involved.
- Zinc or chrome plating: assess suitability against the technical requirements of the individual project.
If the shelf will come into direct contact with unpackaged food, state this in the enquiry. That use requires a separate assessment of the suitability of the material and finish.
6. Fixings and dimensions: check the finished component
The shelf must fit the actual support points. Alongside width and depth, specify the positions of hooks or tabs, bend geometry, bearing surfaces and the clearance needed for installation and removal.
Mark critical dimensions and their tolerances on the drawing. Also clarify whether the dimensions apply before coating or to the finished shelf. Coating thickness can affect fit, particularly around closely matched hooks, slots and guides.
For retail displays, check compatibility with price label holders, dividers and front stops. The front edge should retain products while allowing customers to remove them comfortably.
Wire shelf selection: what to check for each application
| Application or condition | Key design features | Checks before production |
|---|---|---|
| Heavy products, such as drinks bottles | Frame, reinforcement, support span and fixings | Required load, load distribution and acceptable deflection of the complete assembly |
| Small packs or products with narrow bases | Spacing and direction of the supporting wires | Stability of the smallest pack and ease of positioning and moving products |
| Refrigerated equipment with forced-air circulation | Shelf geometry, position and interaction with cabinet components | Required clearances, unobstructed supply and return air openings, and loading instructions |
| Moisture and frequent cleaning | Material, coating system and surface finish | Suitability for the operating temperature, cleaning agents and washing method |
| Displays with dividers and price label holders | Front edge, product stops and accessory attachment points | Accessory compatibility, price visibility and convenient product removal |
| Replacement shelf for existing equipment | Finished dimensions, hooks and support points | Fit after coating and sufficient clearance for installation and removal |
A single shelf may need to meet several of these requirements. Assess the complete design in the intended equipment and with the actual products it will carry.
7. Sampling: test the shelf in its intended application
Before starting a production batch, install a sample in the target cabinet or display. Use actual packaging and the agreed loading arrangement.
Check the fit of the fixings, product stability, behaviour under load, access for cleaning and finish quality. For refrigerated equipment, also assess compatibility with the specified airflow requirements.
A wire shelf sample helps identify necessary changes before the full batch is manufactured. Any accepted changes should then be included in the production drawings and specification.
What should you include in a wire shelf enquiry?
To support an efficient project assessment, provide:
- A technical drawing, or photographs of an existing shelf with dimensions.
- Details of the cabinet or display and how the shelf is supported.
- The product type, required load and load distribution.
- Critical dimensions, tolerances and fixing geometry.
- The required material, finish and operating conditions.
- The quantity, sample requirements and requested delivery date.
At SHELMO, we manufacture wire shelves for refrigeration and retail to customer drawings and specifications, in small and medium production runs. We help clarify technical details and can manufacture a sample before batch production begins.
Specifying a shelf for new equipment or updating an existing design? Send your drawings for a quotation. If some parameters are still open, identify them in your enquiry and describe the intended application.
FAQ: choosing wire shelves
How do I specify the required load capacity of a wire shelf?
State the maximum product weight, load distribution, support positions and acceptable deflection. Capacity must be verified for the specific shelf design, brackets and fixings. Wire diameter alone is not enough to determine it.
How should I choose the wire spacing?
Base the spacing on the size and shape of the smallest product base. Check stability and ease of movement. State whether the drawing specifies the distance between wire centres or the clear gap between adjacent wires.
Does a wire shelf guarantee correct airflow in refrigerated equipment?
No. Cabinet design, shelf position and product arrangement also matter. Follow the equipment manufacturer’s clearance and loading requirements, and keep supply and return air openings unobstructed.
Should I choose PE-coated or stainless steel wire shelves?
The choice depends on temperature, moisture, cleaning methods and product contact requirements. Assess the specific coating or stainless steel grade under the intended operating conditions. No single option suits every application.
Can I order a sample before batch production?
Yes. SHELMO can manufacture a sample based on the drawings and agreed specification. It allows you to check fit, finish quality and shelf performance in the intended application before batch production starts.
