AcoustiRACK Soundproofed Server Cabinets & Accessories
Freedom of Choice - AcoustiRACK™ low noise enclosures allow companies and individuals a greater freedom of choice when selecting new 19inch equipment, and
then to treat the noise generated. Equipment performance, and not the noise levels generated can become the primary factor influencing choice.
Noise Problems Solved - those with existing noisy equipment, or recently purchased servers that prove to be too loud to tolerate can host both older equipment and
new servers inside an AcoustiRACK™ sound insulated cabinet that will address the noise issues.
Improved Productivity - Numerous studies have shown that a quiet environment is conducive to improved cognitive function & decision making. Noise levels from
19" servers and networking/file storage equipment have been increasing steadily in recent years - some units produce sound energy levels that become intolerable
should you work close to them or in an adjacent room.
Health & Safety at Work - recent changes to directives & legislation show the general trend is one towards much lowered tolerance of workplace noise levels.
Quiet Rack Features
Proven to significantly reduce server & rackmounted equipment noise by up to 90%
Unique self-venting cabinet design (patent pending)
Suitable for a wide range of 19-inch rackmount equipment including blade server chassis (1000mm deep)
High quality build & specification (aluminium rigid frame with 1mm steel side panels & roof)
Quick & easy full access for maintenance to both front & rear of the cabinet (doors can be removed in seconds)
Available flat-pack for easy self-assembly (full instructions provided, allow 45mins, tools provided)
Optional assisted venting roof fan kit available (for heavy thermal loads)
Full range of 19" rackmount accessories available (including blanking plates, shelving, castors, cable management etc.)
WHY AcoustiRACK™? Introducing A Quiet Solution to Noisy Rackmount Equipment
An Increasingly Noisy Work Environment
For many of us the computer has become an integral part of today's workplace, and one that we have grown to increasingly depend upon.
The modern computer has evolved into something far removed from its predecessors; it is smaller, faster, more powerful and unfortunately noisier!
This technological increase in efficiency has many benefits but recent studies highlight one negative drawback – the persistent noise levels can significantly lower
human productivity. These studies prove that in a typical fast-paced office environment, background noise can increase work-related stress and reduce
Many workers find themselves sharing an office with noisy rackmounted equipment. The constant loud high frequency noise emitting from the server fans alone can
seriously impede concentration and the ability to get work done. Add this to the other typical office noises, such as ringing telephones and conversations and you
have a highly stressful work environment enough to drive anyone to distraction.
According to the new European Directive for Noise Reduction in the Workplace, if for a part of the working day employees have to raise their voices to carry out a
normal conversation when about 2m apart, then there could be a significant noise problem.
This new directive, introduced for all EU member states from February 2006 sets a new limit on acceptable levels of office noise. This new limit is significantly
lower than the previous national legislation for the majority of these member states. You can see the UK comparison below:
Previous UK Legislation New European Legislation
Lower Action Level 85dB(A) 80dB(A)
Upper Action Level 90dB(A) 85dB(A)
Limit Value None 87dB(A)
This reduction from 85dB(A) to 80dB(A) looks like a small difference in numbers, but actually represents a significant reduction in noise energy.
Below are some examples of typical noise levels:
The new European directive aims to encourage employers to use equipment designed to reduce noise emissions and to ensure that their workplaces comply with
the new directive.
High Noise Levels from Modern Rackmounted Equipment
Noise levels taken at close proximity to some high-end rackmounted equipment could easily exceed 80dB(A) and therefore require action by law. Even when noise
levels do not exceed this, the characteristics of the noise, such as it's monotony, frequency (pitch) and rhythmic pattern can be significant factors in causing
problems with concentration and work output.
In an ideal environment you would replace any noisy equipment with inherently quiet alternatives. However, in some cases this is not possible or practical. In these
cases the European Directive suggests that soundproofed enclosures should be used to isolate the noise source.
The AcoustiRACK™ Noise Reduction Solution
The AcoustiRACK™ range of soundproofed enclosures has been designed to dramatically reduce intrusive noise from 19" rackmount servers and equipment. Below
is a real account of what happened when an AcoustiRACK™ was installed in a noisy office environment:
What the AcoustiRACK™ Achieves
Tests show that the AcoustiRACK™ significantly reduces server noise by up to 90%.
The AcoustiRACK™ allows for rackmounted equipment to be chosen for performance rather than for quietness.
The AcoustiRACK™ also aids cooling, with its unique "self-venting" design with optional assisted venting roof for high-end equipment. It is suitable for a wide range
of rackmount equipment including blade server chassis (600 x 1000mm deep) and has a full range of 19-inch rack accessory equipment available.
For example, in recent tests we registered sound pressure levels 3m from an Intel Blade Server at nearly 70dB(A), which is the equivalent to typical noise levels at
1m from a vacuum cleaner. In addition to the noise level, the server's high whine and constant drone create a highly stressful environment where it is difficult to
By housing the server in an AcoustiRACK™ 42U the sound pressure level registered nearly 60dB(A), a significant drop meaning it is possible to hold a normal
conversation with someone 1m away. Not only was the noise dramatically reduced, but the high frequency whine was eliminated, reducing the high-stress
environment even further.
Thermal Design & Thermal Loading Recommendations
This page explains how the passive cooling design of the cabinet works, gives some thermal load guidelines and summarises our recommendations on how to best
configure equipment inside the AcoustiRACK™ to optimise cooling.
How does Cooling Work in the AcoustiRACK™?
The equipment mounted inside the cabinet creates a low pressure area immediately behind the front door acoustic baffle, and a high pressure area immediately in
front of the rear door sound baffle. Cool air is therefore drawn into the cabinet from the front, warmed by equipment, and expelled from the back of the cabinet around
the rear door baffle.
Where necessary, for very heavy thermal loads, this process can be enhanced by installing the Assisted Venting Roof Tray as an optional accessory (see the
AcoustiRACK™ Accessories page for more details). The Assisted Venting Roof enhances the low pressure behind installed 19-inch servers/equipment and helps
expel warm air built up in the upper parts of the cabinet to the outside.
The passive air venting design of the AcoustiRACK™ is driven by cooling fans inside the installed equipment or servers. This means the cooling potential of the
soundproofed cabinet is related, in part, to the cooling efficiency of the various installed equipment, and the location/configuration of the equipment inside each
As such, the thermal capacities given below must only be considered as guidelines to maximum thermal loading. The thermal capacity for each quiet cabinet is
going to be as unique as the selected servers/equipment installed, and influenced by a number of other factors including arrangement, capacity, and the immediate
Maximum Thermal Capacity Guidelines
24U AcoustiRACK™ 42U AcoustiRACK™
Product Code AR-24U600x1000-G AR-42U600x1000-G
Maximum Capacity* without Assisted Venting Roof 3.0kW 3.5-4.0kW
Maximum Capacity* WITH Assisted Venting Roof 4.0kW 4.5-5.0kW
This information is only a guideline for the systems being constructed and is not intended to be a substitute for system builder verification, validation, and testing on
the reliability and effectiveness of a thermal solution. See the section 'Calculating Thermal Load' (below) for helpful comments on calculating thermal loads.
*The maximum capacity figures are based on the assumptions that the Thermal Recommendations (below) have been satisfied, namely that room temperature does
not exceed 25°C, the AcoustiRACK™ is fitted with front blanking plates blocking vertical gaps between equipment, equipment is mounted at the front of the cabinet,
and no obstruction to free air movement into and out from the cabinet exist.
To achieve the best cooling efficiency inside the AcoustiRACK™, with or without the Assisted Venting Roof Tray, we recommend the following:
(i) Use of Blanking Plates for Empty Space
Ensure gaps between equipment in the front of the cabinet are filled using sound-proofed blanking plates wherever possible - this reduces re-circulation of warm air
inside the cabinet. Blanking plates are available in 4U, 2U and 1U sizes, and add additional noise reduction because they are sound-proofed on the inside of the
plate (using 7mm acoustic materials). Blanking plates are available as a reasonably priced optional accessory, because they are necessary for optimal thermal
performance (see the AcoustiRACK™ Accessories page for more details).
(ii) Mount Equipment towards the Front of the Cabinet
Ensure 19-inch equipment is mounted towards the front of the cabinet - which will also prevent air recirculation, and therefore maximize the cooling potential of the
enclosure. The front vertical 19-inch steel brackets should be located in the front-most position (the first set of holes - as they are fitted upon delivery), and the rear
brackets moved forward to adjust for different equipment depth if necessary.
(iii) Air Conditioning/Room Temperatures
Ensure room air temperature does not range above 25°C if at all possible. Temperatures inside any air-cooled rackmount cabinet are directly related to the intake air
temperature and therefore are dependant on the efficiency of any room/building air conditioning.
(iv) Allow Adequate Venting Space
Ensure the location of the AcoustiRACK™ does not inhibit free air circulation in front, behind and above the cabinet. AcoustiRACK™ cabinets can be co-located side-
by-side to form a row of 19-inch low-noise enclosures. Locate the AcoustiRACK™ enclosure in a space that does not have a heat-source nearby (such as a radiator).
We recommend allowing more than 250mm free air space above the roof of the unit, unless there is a roof air conditioning facility (such as an air extraction
unit/duct) directly above the cabinet. We recommend allowing more than 1m free space in front of and behind the quiet cabinet.
Calculating Thermal Load
This section aims to give comment on calculating thermal load, and provide some helpful links to key web resources.
Technical information regarding maximum thermal loads is given in the majority of servers and 19-inch equipment documentation. It is noteworthy that the pace of
change is high in the processor and memory market, and some thermal data may be out-of-date for some chassis given recent advances in chip and memory power.
IBM - Servers & Workstations x86 Series
IBM - Blade Centre
DELL - Blade Servers & Rack Servers
HP - Servers and Systems
Intel - Servers & Workstations
Intel - Blade Server Systems
The total thermal load of a system is made up from heat directly dissipated from power-hungry components (such as central processing units - CPUs) and heat
generated by losses that occur whenever electrical power is converted or transformed. The main processors in a system will normally account for the largest
proportion of the total thermal load.
High-end CPUs can dissipate up to 110W per chip, so in a typical dual-processor server system this would equate to 220W for those infrequent periods of 100% CPU
load. Although the thermal load at idle is variable between different processors, it is not uncommon for idle thermal dissipation to be up to 60% of the thermal
guideline at 100% CPU load.
Overview of Server Processor Maximum Thermal Loads
Chip Manufacturer/Model CPU Speed Thermal Guideline (Max. Thermal Load) Bus Speed Cache Size Manufacturing Process
Intel® Dual-Core Xeon® 3.0 – 3.76GHz 95-130W 667-1066MHz 4Mb 65nm
Intel® Xeon® 3.0 – 3.8GHz 110W 800MHz 2Mb 90nm
2.8GHz 77-110W 533-800MHz 1-2Mb 90-130nm
2.6GHz 60-71W 400MHz 512Kb 130nm
2.4GHz 65-77W 400-533MHz 512Kb-1Mb 130nm
2.0GHz 58W 400-533Mhz 512Kb 130nm
AMD Dual-Core Opteron™ 2.6GHz 95-110W n/a 2Mb 90nm
AMD Opteron™ 2.8GHz 93-104W n/a 1Mb 90nm
2.6GHz 93-104W n/a 1Mb 90nm
2.4GHz 55-85W n/a 1Mb 90-130nm
2.0GHz 55-89W n/a 1Mb 90-130nm
See Intel and AMD websites for figures relating to exact processor models. Links to specifications for the most popular server/workstation processors are given
Other contributions to thermal load occur from losses in the transformation of AC into DC power, and also in the voltage regulation modules (VRMs) on the system
board that provide power to CPUs and other processors. Electrical power will eventually be transformed and, to a large extent disseminated as heat in a given
system, so the total thermal load can be estimated from the electrical load.
Therefore, a fairly accurate estimation of the total thermal load for a system can be obtained by adding together the electrical power consumption of CPUs and other
significant components, such as graphics processors (GPUs – not common in server systems), memory (DIMMs), and hard disk drives (HDDs).
Of note, is the recent emergence of Fully Buffered Memory Modules (FB-DIMMs) that have a much higher heat dissipation requirement than memory modules have
previously required. Other components such as Hard Disk Drives (HDDs) can also make a significant contribution, particularly when they are present in high
numbers as in storage systems.
The thermal load of a system is dynamic – it will vary with time given the processing load and other activities such as HDD read-write cycle activity.
AcoustiRACK Simply the best soulution
Proven to Significantly Reduce Server & Rackmount
Unique Self-Venting Cabinet Design (Patent Pending)
Suitable for a wide range of 19" Rackmount Equipment including Blade Server Chassis
High Quality Build and Specification
Quick & Easy Full Access for Maintenence
A New Range of Blade-Compatible Soundproofed Rackmount Cabinets.
Listen to the Difference:
Soundproofed Rackmount Cabinets
self-venting 19-inch rackmount cabinets
reduces server noise by up to 90%*
traps and absorbs unwanted noise
free air movement cooling mechanism
available in 42U or 24U sizes
"The AcoustiRACK was so effective that the client had not realised that the units were already turned on!"
- Blacking Plates Available for 1U, 2U, & 4U
- Venting Roof Includes 6 Acousti Dust Proof Fans
AcoustiRACK Soundproofed Rackmount Server Enclosures ULTIMATE NOISE REDUCTION
AcoustiRACK™ is a range of Soundproofed Rackmount Cabinets designed to enclose noisy 19" rack-mounted equipment, such as servers,
networking and audio equipment. The AcoustiRACK™ acoustically treated enclosures are self-venting cabinets that have been designed to trap &
absorb unwanted noise generated inside whilst allowing free air movement and heat exchange with the outside of the unit for cooling.
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|AcoustiRack Soundproofed Server Cabinets
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