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Two-post relay racks[ edit ] Two-post racks provide two vertical posts. These posts are typically heavy gauge metal or extruded aluminum. Equipment can be mounted either close to its center of gravity to minimize load on its front panelor via the equipment's front panel holes.

Two-post racks are most often used for telecommunication installations. ATA road case racks[ edit ] 19" equipment that needs to be moved often or protected from harsh treatment can be housed in an ATA approved road case. Road cases are typically made from PVC laminated plywood sides, joined by extruded aluminum edging, steel corners, handles and latches.

Larger cases typically have wheels for easy transport. Road case racks come in different heights vol 19 mm 1u on the 1U vol 19 mm 1u and different depths.

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Non-isolated cases simply mount 19" mounting rails inside the case. To protect equipment from shock and vibration road rack cases use an inner and outer case.

These cases can be isolated by thick layers of foam or may use spring loaded shock mounting. Touring musicians, theatrical productions, and sound and light companies use road case racks. A variety of airflow patterns can be found, including front intakes and rear exhausts, vol 19 mm 1u well as side intakes and vol 19 mm 1u.

Low-wattage devices may not employ active cooling, but use only passive thermal radiation and convection to dissipate heat.

19-inch rack

For rack mounted computer servers, devices generally intake air on the front and exhaust on the rear. This prevents circular airflows where hot exhaust air is recirculated through an adjacent device and causes overheating.

Although open-frame racks are the least expensive, they also expose air-cooled equipment to dust, lint, and other environmental contamination. An enclosed sealed cabinet with forced air fans permits air filtration to protect equipment from dust.


Large server rooms will often group rack cabinets together so that racks on both sides of an aisle are either front-facing or rear-facing, which simplifies cooling by supplying cool air to the front of the racks and collecting hot air from the rear of the racks.

These aisles may themselves be enclosed into a cold air containment tunnel so vol 19 mm 1u cooling air does not travel to other parts of the building where it is not needed or mixes with hot air, making it less efficient. Raised or false floor cooling in server rooms can serve a similar purpose; they permit cooling airflow to equipment through the underfloor space vol 19 mm 1u the underside of enclosed rack cabinets.

The fans themselves can be difficult to replace.

In the case of network equipment, it may vol 19 mm 1u necessary to unplug 50 or more cables from the device, remove the device from the rack, and then disassemble the device chassis to replace the fans.

However, some rack equipment has been designed to make fan replacement easy, using quick-change fan trays that can be accessed without removing the cabling or the device from the rack, and in some cases without turning off the device so that operation is uninterrupted during replacement.

Computer keyboard and monitor mounted on a sliding tray in a rack The formal standards for a inch Basic dimensions of front panels, subracks, chassis, racks and cabinets IEC Part Subracks and associated vol 19 mm 1u units IEC Part Keying and alignment pin IEC Part Connector dependent interface dimensions of subracks and plug-in units IEC Part DIN Components on front panels; mounting conditions, dimensions DIN IEC see above vol 19 mm 1u IEC section A rack's mounting fixture consists of two parallel metal strips also referred to as "posts" or "panel mounts" standing vertically.

The posts are each 0.


The posts have holes in them at regular intervals, with both posts matching, so that each hole is part of a horizontal pair vol 19 mm 1u a center-to-center distance of The hole pattern thus repeats every 1. Holes so arranged can either be tapped usually UNF thread, or, less often, 6mm metric or have square holes for cage nuts.

Rack unit U [ edit ] Main article:

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