A fan tray can meet its drawing dimensions on a bench and still behave differently after fans, cables and chassis supports are added. Increasing sheet thickness is one possible response, but it is not a complete stiffness specification. The location of supports, return flanges and openings often determines which part of the tray can move.
An OEM RFQ should describe the installed condition before asking a fabricator to recommend a metalwork route. For custom fan-tray fabrication, separate three questions: will the tray fit, will it support its components, and how will the assembled equipment respond to its operating environment?
Start with the support and mass map
Mark every attachment to the chassis, including rails, rear supports and any surfaces that only locate the tray during insertion. Identify which interfaces carry load after latching. A large opening or a long unsupported span can make two trays with identical outside dimensions behave differently.
Provide the mass and location of each installed component, including harnesses, guards and brackets. Note whether the tray is horizontal, vertical or used in multiple orientations. An unloaded inspection fixture cannot represent every installed load condition.
| Input | Useful RFQ detail | Why it changes the review |
|---|---|---|
| Supports | Attachment locations, rail contacts and latch preload | Defines the effective unsupported spans |
| Installed components | Mass, center locations and fastener interfaces | Shows where the structure carries load |
| Operating excitation | Fan operating range and system vibration specification | Allows the responsible engineer to assess response |
| Acceptance | Allowable movement, test configuration and functional checks | Separates a design objective from a verified result |
Choose a reinforcement that addresses the deformation
A folded edge return may help a long tray edge. A local bracket may address movement near an attachment. A cross-member can shorten a span, but it can also interfere with airflow, fan replacement or cable routing. Ask the design team to identify the observed or predicted deformation before choosing a reinforcement.
Avoid placing a stiffener solely where there is empty CAD space. Its load path must connect to the areas that need support. Check weld or fastener access, finish coverage and whether the added part changes the tray’s insertion envelope.
If the concern is screw preload distorting a fan mounting face, a broad stiffener elsewhere may not solve it. Define flatness or installed movement at the relevant interface and agree how the tray will be supported during measurement.
Treat isolators as selected components
Elastomer grommets and isolators have installation, load and environmental limits. Their use can affect fan alignment, fastener retention and movement during transport. A softer interface is not automatically a better overall solution.
Specify the exact component and its intended compression or mounting arrangement. The engineer responsible for the assembly should evaluate whether the isolator is appropriate for the excitation and operating conditions. Do not substitute a visually similar part without approval.
Write a test request that can be quoted
“Vibration resistant” does not define a reproducible acceptance test. Identify the applicable method, severity, axes, duration, operating state and representative installed hardware. The IEC 60068-2-6 standard overview concerns sinusoidal vibration; referring to it is not a substitute for specifying the test conditions needed by the equipment program.
State what will be examined before, during and after testing. Depending on the project, the responsible team may assess fastener retention, permanent deformation, functional operation or connector condition. These are separate from a dimensional first-article report.
Keep production inspection practical
After design validation, translate the released solution into controllable production characteristics: material, formed dimensions, reinforcement location, attachment hardware and any agreed assembly checks. A production drawing should not imply that every tray undergoes a vibration test unless that requirement is actually ordered.
Use an inspection fixture for the agreed mechanical interfaces, and retain environmental validation as a separately defined activity. This makes it possible to quote repeatable metalwork without confusing manufacturing inspection with complete-system qualification.
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