Choosing an industrial computer enclosure starts with the equipment’s heat-removal strategy, not with a preference for a solid or perforated cover. A fan-cooled enclosure needs a defined airflow arrangement. A conduction-cooled assembly needs controlled thermal interfaces and a route from the heat source to the environment.
Neither approach can be qualified from a sheet-metal drawing alone. The OEM must supply the operating conditions, component configuration and acceptance criteria. The fabricator can then quote the industrial computer enclosure and its controlled mechanical interfaces against those inputs.
Ask what the enclosure must carry
In a conduction-cooled arrangement, identify whether the sheet-metal shell is only protective or also part of a thermal path. A separate machined plate or finned component may carry the thermal function. That part needs its own specification and supply responsibility.
For fan cooling, identify the selected fans, intake and discharge locations, filters and internal obstructions. An empty enclosure opening does not determine system airflow. Cables, boards, guards and filters can all change the assembled condition.
| Design input | Conduction-cooled arrangement | Fan-cooled arrangement |
|---|---|---|
| Critical mechanical interface | Contact surfaces, mounting pressure and thermal-stack geometry | Fan mounts, openings, seals and airflow partitioning |
| Purchased components | Thermal interface materials and heat-transfer parts | Fans, filters, harnesses and controls |
| Service concern | Re-establishing the approved contact stack | Filter replacement, fan access and cable clearance |
| Validation | Complete thermal configuration at specified conditions | Complete thermal configuration at specified conditions |
Define the contact stack for conduction
When heat passes through a mechanical joint, the engineer should specify the relevant contact area, surface condition, interface material and fastening arrangement. Avoid replacing this with a blanket instruction to make every surface exceptionally flat.
Identify the dimensions that establish compression or contact and the surfaces that need masking. Finish changes can affect the contact arrangement and must be reviewed by the responsible engineer. A supplier should not remove coating from a thermal or bonding area based on an informal assumption.
The contact stack should also be serviceable. If a cover is removed, explain which interface materials must be replaced and how the approved assembly condition is restored. A maintenance procedure that changes contact pressure can alter the thermal configuration even when the enclosure still closes correctly.
Define the flow path for fan cooling
Specify intake, discharge and any internal separation needed by the system design. Review short bypass paths around a fan carrier, gaps at removable panels and interference from cable bundles. These are mechanical inputs to the thermal assessment, not substitutes for it.
Rittal’s enclosure-cooling resources distinguish several climate-control approaches. The appropriate choice depends on the equipment and ambient conditions; a general product category is not a cooling rating for a custom enclosure.
Keep environmental protection and maintenance visible
A sealed-looking housing can still experience internal condensation under changing conditions. A filtered inlet can require regular access and replacement. Neither “fanless” nor “filtered” is a complete environmental specification.
Use the condensation RFQ checklist to describe temperature changes, humidity and installation. For fan-cooled equipment, agree filter access and the operating condition used for thermal evaluation. Include the required mounting orientation because it can affect service space and the equipment’s thermal behavior.
Give purchasing a comparable scope
The RFQ should separate fabricated enclosure parts, heat-transfer components, fans, filters, installation and validation. Include the released CAD, material and finish, contact or opening details, component references and planned quantities.
A useful supplier response identifies the mechanical scope it can manufacture and the unresolved system inputs. Comparing only enclosure dimensions and unit price may hide the cost of thermal interfaces, filter access or purchased-component assembly. Resolve those boundaries before approving a pilot build, then validate the complete equipment under the OEM’s defined conditions.
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