Short answer: Door and drawer collisions are found by overlaying every moving envelope during the busiest task sequence, not by checking whether each appliance fits while closed.
Oven doors, fridge drawers, dishwasher hoods or room doors collide during service. The common misconception is that if each closed appliance fits, the aisle works. This article turns that assumption into specific checks that can be recorded on the drawing, survey or commissioning sheet.
Model-specific rule: Avoid universal aisle dimensions; test the operation and applicable workplace/fire requirements. Where gas, electricity, refrigeration, guarded components, hot oil, pressure or safety controls are involved, use the appropriately competent engineer and never bypass a safety device.
Test simultaneous openings
During service, an oven door, refrigerated drawer and room door may all move at once. A drawing should show the combined pinch point, not three separate successful checks.
- Overlay appliance and room-door arcs.
- Extend drawers and racks fully.
- Include staff position and tray width.
Follow the hot tray
The critical path often begins with an open oven or fryer basket and ends at a landing point or pass. Any collision that forces twisting, waiting or walking around another operator reduces safe throughput.
- Mark the hot-load route.
- Keep landing space inside a short controlled movement.
- Prevent the route crossing dirty returns.
Check the altered layout
A later refrigerator, thicker wall finish, handle change or table upstand can remove the tolerance that existed on the design drawing. Repeat the collision check after final equipment selection.
- Use final model dimensions.
- Include wall finishes and stainless upstands.
- Recheck substitutions before delivery.
What the site evidence may show
| Observation | Hidden issue | Next check |
|---|---|---|
| Doors clear individually | Two openings overlap | Run simultaneous-use scenarios |
| Aisle width appears adequate | Operator stands inside door arc | Add body and load position |
| Design model clears | Substitute has different hinge/handle | Recheck exact selected model |
A practical verification sequence
- Confirm the exact duty and model. Record what the appliance or space must achieve at peak service and use the current model-specific installation information.
- Draw the complete interface. Include moving parts, service/removal access, connections, adjacent equipment and the real operator or trolley position.
- Measure under a representative condition. Static, empty or isolated tests can hide the issue. Record the operating state, value, unit and test point.
- Correct and prove. Repeat the same test after any change and retain the evidence with commissioning or O&M information.
Checks to record:
- Door arcs.
- drawer extension.
- rack/trolley length.
- aisle pinch point.
- opposing equipment openings.
- fire-door swing..
Overlay every moving envelope at the same time and test the busiest sequence: hot tray removal, trolley passing, fridge access and dirty rack return. The result should be a measurable decision rather than a generic note such as “allow sufficient space” or “services by others”.
Common mistakes to avoid
- Checking openings one at a time.
- Ignoring room and fire-door swings.
- Measuring cabinet depth without handles.
- Assuming left- and right-hinged variants are interchangeable.
Frequently asked questions
Do all doors need to open together?
Test credible peak-service combinations, especially where hot loads, clean racks or escape routes are involved.
Can a door stop solve the problem?
Only where appropriate and compliant; it must not create another operational or fire-safety problem.
When should the check be repeated?
After exact models, hinges, wall finishes and adjacent fabrications are confirmed.
Related Kitchen Install Guide reading
- Commercial Kitchen Site Survey Checklist
- Commercial Kitchen Equipment Duty Categories
- How Much Space Should Be Left Around Kitchen Equipment?
Record the installation detail before handover
Use the KIG 318 Commercial Kitchen Installation Checklist to record equipment interfaces, measured conditions, outstanding actions and acceptance evidence.
Sources and further guidance
- HSE: Workplace health, safety and welfare (L24)
- HSE: University kitchen ergonomic case study
- Winterhalter: PT Series passthrough dishwasher
Last reviewed: 14 August 2026. This article provides general commercial-kitchen design and installation information. It does not replace the exact manufacturer instructions, a site-specific design, risk assessment or work by competent specialists. Stop use and obtain competent help where equipment or services may be unsafe.