Designing an 8U vertical Eurocard system is not only a matter of providing enough card slots. The enclosure must maintain controlled airflow, preserve access for service, accommodate the selected backplane and power architecture, and hold the mechanical tolerances required for reliable card insertion and retention.
The Vector Series 445 addresses these requirements with a vertical 6U × 160 mm front card cage inside an 8U rackmount chassis. Its cooling architecture uses two coordinated fan groups: three 120 mm axial fans below the front card cage and three additional 120 mm axial fans on the rear panel. This arrangement changes both thermal design and service planning compared with a chassis that relies on a single exhaust location.
Series 445 at a glance
| Parameter | Specification |
|---|---|
| Chassis height | 8U; 13.97 in. (354.81 mm) |
| Rack width | 19 in. (482.6 mm) |
| Overall depth | 21.6 in. (548.6 mm) for 160 mm depth cards |
| Card cage | 6U × 160 mm |
| Card cage configuration | Splittable into two 3U × 160 mm sections |
| Supported systems | 3U or 6U VME, VME64x, cPCI, or VPX backplanes |
| Mechanical compliance | IEEE 1101.1 and IEEE 1101.10 |
| Construction | Lightweight aluminum |
| Operating temperature | 0°C to 50°C |
| Non-operating temperature | −40°C to 75°C |
| Flammability | UL94V-0 |
| Cooling | Front-bottom intake and rear exhaust |
| Fan arrangement | Three 120 mm fans below the cage and three 120 mm rear exhaust fans |
| Power options | Plug-in 3U or 6U × 8HP × 160 mm supply, or embedded industrial supply |
The Series 445 is documented as a fully assembled, wired, and tested chassis. That system-level configuration is important when the enclosure is part of a larger production program rather than an isolated mechanical assembly.
A vertical cage for mixed 3U and 6U architectures
The front card cage accepts 6U × 160 mm boards and can be divided into two 3U × 160 mm sections. This provides a practical way to organize systems that combine board heights or separate functional groups within one enclosure.
The supported backplane families include:
- VME
- VME64x
- CompactPCI
- VPX
The cage design follows the mechanical envelope associated with IEEE 1101.1 and IEEE 1101.10. These standards define important aspects of Eurocard and front-panel integration, including board dimensions, card guides, front-panel interfaces, and related mechanical features. Compliance provides a defined mechanical basis for integrating standard boards, front panels, ejector hardware, and backplane assemblies.
The recessed front card cage also protects the board and panel area from direct exposure at the chassis face. In a deployed system, the recess can help preserve front-panel alignment and reduce the likelihood that protruding components or handles become the first point of mechanical contact during installation and maintenance.
The 21.6-inch chassis depth accommodates 160 mm depth cards while leaving space for the backplane, power entry, wiring, cooling structures, and rear-panel interfaces. The enclosure is 19-inch rackmountable according to EIA-310D, allowing it to be integrated into standard equipment racks and cabinets.
Why the two fan groups matter
The Series 445 cooling system is based on a front-to-rear airflow path:
- Air enters through the front-bottom intake.
- A removable bottom fan tray moves air upward and into the card-cage region.
- Air passes through the vertical board area and associated electronics.
- Three rear-panel axial fans exhaust the heated air.
This is not simply a higher fan count. The location of the fan groups affects how the chassis is thermally analyzed and serviced.
A single fan wall often establishes one dominant pressure zone. Components near the inlet may receive substantially cooler air than components near the outlet, while restrictions around card guides, front panels, backplanes, and power supplies can create localized pressure losses. In a vertical Eurocard system, those variations can become significant because cards occupy a large portion of the airflow cross-section.
The Series 445 separates the intake and exhaust functions physically. The lower front fan tray supports air delivery into the card cage, while the rear fan group maintains the discharge path. The result is a defined airflow direction through the system rather than a general circulation volume inside the enclosure.
This approach changes several design considerations.
Thermal mapping must include the complete path
Thermal validation should examine the inlet, card-cage region, backplane area, power-supply location, and rear exhaust. Measuring only the temperature near the front intake does not establish the temperature seen by downstream boards.
For a populated chassis, the system-level test should account for:
- Installed board count and power dissipation
- Front-panel aperture and card-guide restrictions
- Backplane loading
- Power-supply heat contribution
- Filter condition
- Fan operating condition
- Ambient temperature up to the specified 50°C operating limit
The specified operating range is 0°C to 50°C. The non-operating range is −40°C to 75°C. These are enclosure environmental specifications, not a substitute for board-level thermal qualification. Individual boards, power supplies, connectors, and components may have narrower limits.
Service access becomes part of the thermal design
The front-bottom fan tray is removable, and the chassis includes a removable, cleanable air filter. These features make routine airflow maintenance possible without treating the chassis as a sealed, permanent assembly.
The filter should be considered a service item. As particulate loading increases, airflow resistance also increases. That can reduce the air volume delivered through the card cage and change the pressure balance between the intake and exhaust fan groups. A maintenance procedure should therefore define inspection intervals, cleaning methods, and acceptance criteria.
The rear fan group must also remain unobstructed. Rack placement, adjacent equipment, cable bundles, and cabinet exhaust conditions can affect the ability of the rear fans to discharge heated air. A chassis-level airflow specification does not eliminate the need to evaluate the installed rack or cabinet environment.
Power integration and monitoring
The Series 445 supports either a plug-in or embedded power architecture. The plug-in option accepts a 3U or 6U × 8HP × 160 mm supply based on PICMG 2.11 Revision 1.0. An embedded industrial-type power supply can be used where the system requires a different electrical or mechanical arrangement.
The power decision affects more than available wattage. It influences:
- Internal heat generation
- Cable routing
- Service access
- Backplane interface location
- Mechanical balance
- Cooling requirements
- Replacement strategy
A power supply installed within the chassis becomes part of the same thermal path as the card cage. Its losses must be included in the system heat-load calculation, particularly when the enclosure is populated with high-power processing, switching, or data-acquisition boards.
The Series 445 also supports system-voltage monitoring locally through LEDs and remotely through RJ-45 or RS-485 interfaces. This allows the monitoring method to be matched to the equipment architecture. Local indicators support bench and rack service, while remote interfaces can connect chassis status to a control or maintenance system.
Configuration control for test-ready systems
A vertical card cage, backplane, power supply, fan system, monitoring interface, and wiring harness should be treated as one controlled configuration. Changes to any one of these elements can affect the others.
For example, changing the backplane may alter:
- Slot population
- Connector loading
- Signal routing
- Power distribution
- Card spacing
- Airflow blockage
- Cable routing
The Series 445 supports custom backplane design, different power-supply options, and mechanical modifications. These options are most effective when released through a controlled system definition that identifies the board set, backplane revision, power configuration, fan arrangement, monitoring implementation, and mechanical drawings.
A fully assembled, wired, and tested chassis can provide a test-ready starting point for system integration. Rather than receiving unrelated mechanical and electrical components that must be assembled and debugged at the next integration site, the system can be evaluated as a defined enclosure-level configuration. This can reduce integration uncertainty and help prevent avoidable re-spins caused by mismatched mounting, connector, wiring, or cooling assumptions.
For legacy refresh programs, the same principle applies. Existing VME or VME64x electronics may continue to require a current mechanical platform, revised power implementation, or updated monitoring. The chassis must preserve the established board and backplane interfaces while accommodating the practical requirements of present-day production and service.
Engineering considerations before release
Before releasing a Series 445 configuration, the engineering review should confirm:
- Whether the cage will be used as one 6U section or two 3U sections
- The selected VME, VME64x, cPCI, or VPX backplane
- Board depth and front-panel dimensions
- Total card-cage power dissipation
- Power-supply format and heat contribution
- Required monitoring interfaces
- Filter access and maintenance clearance
- Rear exhaust clearance in the target rack
- Cable routing around fans and rear connectors
- Operating temperature limits for the complete assembly
- Wiring, test, and configuration documentation
The Series 445 provides a defined mechanical and thermal platform for vertical Eurocard systems, but system performance still depends on the final configuration. The enclosure, backplane, power supply, cards, wiring, and rack environment must be evaluated together.
The design principle
Dual-sided airflow changes the chassis from a container with fans into a managed thermal path. Intake delivery, card-cage pressure, rear extraction, filter condition, power-supply losses, and service access all become part of the system design.
For an 8U vertical Eurocard enclosure, the relevant question is not only whether fans are present. It is whether the airflow path is defined, maintainable, and validated with the final board and power configuration. The Series 445’s split card-cage architecture, removable intake fan tray, rear exhaust group, serviceable filter, and configurable power and monitoring options provide the mechanical basis for making that evaluation systematic.
View the Vector Series 445 specifications and review Vector’s chassis and system enclosure families.
Explore compatible backplane solutions and plug-in power-supply specifications.