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Publishes both airflow units, and says the figure is free-blowing

DIGITUS four-fan roof module, 9.2 m³/min and 552 m³/h free-blowing, 60–65 dB, 13.8 W

The best-measured cooling unit in this hub and the only one that says what its airflow figure assumes: 552 cubic metres an hour, free-blowing, which is not the same as inside a closed cabinet.

DIGITUS black four-fan roof cooling module for a network cabinet

DIGITUS four-fan roof module, 9.2 m³/min and 552 m³/h free-blowing, 60–65 dB, 13.8 W

The best-measured cooling unit in this hub and the only one that says what its airflow figure assumes: 552 cubic metres an hour, free-blowing, which is not the same as inside a closed cabinet.

Fan count
Four — stated in the title and in the third bullet, which gives the count alongside the two airflow figures
Fan size
Not published on the listing — no diameter and no frame dimension appears in any bullet. The third gives the airflow and the count and no dimension for either fan
Stated airflow
9.2 m³/min, and 552 m³/h given as the free-blowing volume flow — both stated in the third bullet. The words free-blowing are the maker’s own and they qualify the figure: it is the throughput with nothing resisting it, rather than inside a closed cabinet
Airflow unit
Cubic metres, published twice — per minute and per hour. The other measured unit on this shelf publishes cubic feet per minute, so the two cannot be compared without converting one of them
Stated noise level
60 to 65 dB with four fans fitted — stated in the fourth bullet, which ties the figure explicitly to the number of fans running. The measuring distance is not published on the listing. It is the loudest figure on this shelf
Roof or rack-mount format
Roof — stated in the title and in the second bullet, which describes a roof fan module and says matching holes are present in the cabinet roof of the ranges named in the first
Rack units occupied
None stated, and a roof module consumes none: the second bullet places it in the cabinet roof rather than on the profile rails. No rack unit figure appears on the page
Airflow direction
Not published on the listing — nothing says which way the fans push and nothing says whether they can be turned in their frame. The second bullet places the module in the roof and stops there
Thermostat or speed control
A thermostat covering 0 °C to +35 °C — stated in the fourth bullet. It is one of two threshold ranges published on this shelf and the narrower of the two
Power connection
A rated power of 13.8 W, with an input of AC 50 Hz at 240 V, AC 60 Hz at 220 V or DC 48 V — all stated in the fifth bullet. No lead, inlet or plug type is published
Amazon reference
B00DNRPFQG (same reference on 6 Amazon marketplaces)
EAN
4016032332855
  • The only listing here that says what its airflow figure assumes, by naming it free-blowing
  • Publishes the airflow in two units, so no conversion is needed to read it
  • Sixty to sixty-five decibels, the loudest figure published in this hub

Best for: A DIGITUS cabinet of one of the named ranges, in a room where nobody has to sit next to sixty decibels.

≈ 92 €
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Specifications

Fan count
Four — stated in the title and in the third bullet, which gives the count alongside the two airflow figures
Fan size
Not published on the listing — no diameter and no frame dimension appears in any bullet. The third gives the airflow and the count and no dimension for either fan
Stated airflow
9.2 m³/min, and 552 m³/h given as the free-blowing volume flow — both stated in the third bullet. The words free-blowing are the maker’s own and they qualify the figure: it is the throughput with nothing resisting it, rather than inside a closed cabinet
Airflow unit
Cubic metres, published twice — per minute and per hour. The other measured unit on this shelf publishes cubic feet per minute, so the two cannot be compared without converting one of them
Stated noise level
60 to 65 dB with four fans fitted — stated in the fourth bullet, which ties the figure explicitly to the number of fans running. The measuring distance is not published on the listing. It is the loudest figure on this shelf
Roof or rack-mount format
Roof — stated in the title and in the second bullet, which describes a roof fan module and says matching holes are present in the cabinet roof of the ranges named in the first
Rack units occupied
None stated, and a roof module consumes none: the second bullet places it in the cabinet roof rather than on the profile rails. No rack unit figure appears on the page
Airflow direction
Not published on the listing — nothing says which way the fans push and nothing says whether they can be turned in their frame. The second bullet places the module in the roof and stops there
Thermostat or speed control
A thermostat covering 0 °C to +35 °C — stated in the fourth bullet. It is one of two threshold ranges published on this shelf and the narrower of the two
Power connection
A rated power of 13.8 W, with an input of AC 50 Hz at 240 V, AC 60 Hz at 220 V or DC 48 V — all stated in the fifth bullet. No lead, inlet or plug type is published
Amazon reference
B00DNRPFQG (same reference on 6 Amazon marketplaces)
EAN
4016032332855

On the listing

A roof fan module for DIGITUS Unique and Unique Light network cabinets and Unique Server-N server cabinets, with matching holes present in the cabinet roof, in black; four fans, an airflow of 9.2 m³/min and a free-blowing volume flow of 552 m³/h; a thermostat covering 0 °C to +35 °C and a noise level of 60 to 65 dB with four fans fitted; and a rated power of 13.8 W with an input of AC 50 Hz at 240 V, AC 60 Hz at 220 V or DC 48 V.

Free-blowing, which is the honest word

Two words in the third bullet make this the best-documented cooling unit in this hub.

Five hundred and fifty-two cubic metres an hour, free-blowing.

A fan tested with nothing in front of it moves more air than the same fan bolted into the roof of a closed cabinet, because a cabinet is a series of obstructions — entries, vents, equipment, cable bundles — and each of them is resistance the fan has to push against. The figure that results in a real installation is lower, and how much lower depends on the cabinet rather than on the fan.

Every fan specification anywhere has this problem. What is unusual is a listing that says so. The other measured unit on this shelf publishes a range and never qualifies it; the five remaining listings publish no airflow at all.

Reading it correctly does not make the number less useful. It makes it comparable, which is the whole point.

Two units for one figure

The same bullet publishes cubic metres per minute and cubic metres per hour: 9.2 and 552.

They are the same measurement multiplied by sixty, which sounds redundant and is not. Makers use both, and a buyer holding two datasheets in different units has to convert one of them before the comparison means anything. Publishing both removes the step, and it removes the most common error on this shelf.

The one comparison that still needs work is with the other measured unit here, which publishes cubic feet per minute. Metric and imperial are not the same scale, and the numbers look nothing like each other.

Sixty to sixty-five decibels

This is the loudest figure in this hub, and it is published rather than hidden.

The fourth bullet ties it explicitly to the condition producing it: 60 to 65 dB with four fans fitted. That qualification is the same instinct as the free-blowing one — a number given with the circumstance that produced it.

What it means in practice is that this is not a unit for a cabinet in a study or a bedroom wall. It is a unit for a plant room, a garage, a cupboard behind a closed door. The thermostat helps, because 0 to +35 °C means the fans are not running when the cabinet is cool, but when they run they will be heard.

No measuring distance is published, which is the gap both noise figures on this shelf share.

Watts, and a DC input

The fifth bullet publishes a rated power of 13.8 W and three input options, one of them 48 V DC.

The wattage is the figure nobody else on this shelf gives, and it answers a question about running a unit continuously that airflow cannot. The DC option is unusual in a domestic context and entirely ordinary in a rack that has a 48 V supply in it already.

The cabinets it is drilled for

The compatibility is the constraint, and the first two bullets are clear about it: Unique and Unique Light network cabinets, Unique Server-N server cabinets, matching holes present in their roofs.

A roof module goes through a cut-out. If the cut-out is not there or is a different shape, the module has nowhere to sit. This page describes the alignment for the ranges it names and says nothing about anything else, which is a limit rather than a fault — but it is the first thing to check.

Before ordering

Confirm the cabinet is one of the named ranges, or measure the roof aperture and ask. Read the airflow as a free-blowing figure and expect less in a closed cabinet. And listen to the room before committing: 60 to 65 dB is the loudest thing on this shelf, and it is published for a reason.

Availability

Priced from 92 € to 145 € across the German, French, Italian and Spanish Amazon stores the day this page was checked.

It is stocked on the British Amazon store as well, in that country’s own currency. The range above leaves those out: it counts euro stores and no others.

In the American Amazon catalogue with no live offer against it: the reference exists, nobody is filling it.

Every figure in this section is what Keepa held on the day this page was last updated. Stock and prices move without warning.

Prices quoted in this text were read on 10 September 2026. The live price is at the top of the page.

More rack cooling fans

  • Aiten Data black 19-inch 1U cooling panel with four fans and a digital display

    aiten data 19-inch 1U panel, four 12 cm ball-bearing fans, digital thermostat, 485 × 305 × 45 mm

    Four twelve-centimetre fans on ball bearings, which is the only fan dimension published anywhere in this hub, with a digital stage control and every outer measurement printed.

    Fan count
    Four — stated in the title and in the second bullet, which describes four fans of 12 cm diameter with ball bearings
    Fan size
    12 cm in diameter, with ball bearings — stated in the second bullet. It is the only fan dimension published on this shelf, and the bearing type is named nowhere else either
    Stated airflow
    Not published on the listing — no figure appears in any bullet. The second gives the fan diameter and the bearing type instead, which describe the fans rather than what they move
    Airflow unit
    Not published on the listing, because no airflow figure is given for a unit to attach to
    Stated noise level
    Not published on the listing — no decibel figure and no measuring distance appears anywhere on the page
    Roof or rack-mount format
    Rack-mounted — the first bullet gives a standard width of 19 inches and a height of 1U, and the third describes side anchorages for easy fixing to rack cabinets
    Rack units occupied
    One — stated in the first bullet. The fifth gives the height as 45 mm, which is a rack unit
    Airflow direction
    Not published on the listing — nothing says which way the fans push, and nothing says whether they can be turned in their frame. None of the seven listings on this shelf publishes a direction
    Thermostat or speed control
    A digital display with which the stages can be controlled, and an internal temperature sensor — both stated in the second bullet. No threshold range and no number of stages is published on the listing
    Power connection
    220 V at 50 Hz with a European plug — stated in the second bullet. It is the only listing on this shelf to name the plug type
    Amazon reference
    B08K98WW7T (same reference on 5 Amazon marketplaces)
    EAN
    6940533543527
    • Publishes the fan diameter, 12 cm, which no other listing in this hub does
    • Names the bearing type, which is what decides how a fan ages
    • No airflow figure and no noise level, on a panel with four fans of a stated size

    Best for: A 19-inch rack where the fan size matters for replacement later, and the buyer can spare a rack unit for the panel.

    ≈ 108 €
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  • DSIT black four-fan cooling unit for a deep server cabinet

    DSIT four-fan unit with thermostat for 800 mm cabinets, 410 × 40 × 40 mm

    Four fans and a thermostat sold for a specific cabinet depth, with a fourth bullet that does something no other listing in this hub does: it tells you when the product will work less well.

    Fan count
    Four — stated in the title as a fan package of four fans with a thermostat, and named again in the first bullet, which consists of the single word fans
    Fan size
    Not published on the listing — no diameter appears. The fifth bullet gives the unit as 410 × 40 × 40 mm in width, depth and height, which describes the assembly rather than a fan
    Stated airflow
    Not published on the listing — no figure appears in any bullet. The fourth qualifies the unit’s effectiveness instead, saying it decreases with a server cabinet that has perforated doors
    Airflow unit
    Not published on the listing, because no airflow figure is given for a unit to attach to
    Stated noise level
    Not published on the listing — no decibel figure and no measuring distance appears anywhere on the page
    Roof or rack-mount format
    Not published on the listing — the title calls it a fan unit suitable for server cabinets of 800 mm depth, and no bullet says whether it mounts in the roof, on the profile rails or anywhere else
    Rack units occupied
    Not published on the listing — no rack unit figure appears, and the mounting format that would imply one is not stated either
    Airflow direction
    Not published on the listing — nothing says which way the fans push. The fourth bullet is the only statement anywhere on this shelf about where the air ends up, and it is a warning rather than a direction
    Thermostat or speed control
    A thermostat — stated in the title as part of the package. No threshold range, no display and no control detail is published on the listing
    Power connection
    A connecting cable is included, described in the third bullet as 3-port, Del-109. No voltage, no plug type and no lead length is published
    Amazon reference
    B017M06LSA (same reference on 5 Amazon marketplaces)
    EAN
    8719172411638
    • States a condition in which the unit works less well, which nothing else in this hub does
    • Four fans and a thermostat together, at the lower half of this shelf
    • No mounting format anywhere, so nothing says where in the cabinet it goes

    Best for: A deep floor-standing cabinet of around 800 mm where four fans and a thermostat are wanted and the seller can be asked the rest.

    ≈ 113 €
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  • Extralink black four-fan 19-inch cooling panel with a digital temperature display

    EXTRALINK four-fan 19-inch panel with thermostat, digital display, threshold -40 to 50 °C

    The only cooling unit here that publishes the range its thermostat can be set across, and the only one with a fuse named in the description rather than left inside the case.

    Fan count
    Four — stated in the title as a fan panel with four fans for a floor-standing server cabinet
    Fan size
    Not published on the listing — no diameter and no frame dimension appears in any bullet. The second calls the unit both strong and quiet without measuring either
    Stated airflow
    Not published on the listing — no figure appears. The first bullet says the unit secures optimal air circulation in a 19-inch cabinet, protects the equipment and increases its service life, all without a number
    Airflow unit
    Not published on the listing, because no airflow figure is given for a unit to attach to
    Stated noise level
    Not published on the listing — the second bullet describes the unit as quiet and no decibel figure and no measuring distance follows it
    Roof or rack-mount format
    Not published on the listing as one or the other — the title names a fan panel for a 19-inch network cabinet and a floor-standing server cabinet, and no bullet says whether it sits in the roof or on the profile rails
    Rack units occupied
    Not published on the listing — no rack unit figure appears anywhere, and the mounting format that would imply one is not stated either
    Airflow direction
    Not published on the listing — nothing says which way the fans push, and nothing says whether they can be turned in their frame
    Thermostat or speed control
    A thermostat with a digital temperature display, stated in the title and in the second and third bullets, with thresholds settable from -40 to 50 degrees according to the fourth. It is the widest threshold range published on this shelf and the only one given as a span
    Power connection
    Not published on the listing — no lead, inlet, voltage or plug is named. The fifth bullet offers a 36-month warranty instead
    Amazon reference
    B09ZVJY6VC (same reference on 5 Amazon marketplaces)
    EAN
    5903148914718
    • Publishes the threshold range the thermostat covers, which only one other unit here does
    • A built-in fuse, named in the title and nowhere else in this hub
    • No airflow figure at all, on a four-fan panel

    Best for: A floor-standing cabinet where the thermostat needs setting precisely and the buyer already knows how the panel will be mounted and powered.

    ≈ £140 / 132 €
    Check price on Amazon

Others worth having spare

  • HB-DIGITAL black 19-inch 1U rack shelf with raised edges

    HB-DIGITAL 19-inch 1U shelf, 270 mm deep, 480 × 265 mm usable, no load figure published

    One of only two shelves here to publish a usable surface — 480 by 265 millimetres — and the only one that calls itself heavy-duty in the title and then never says what it carries.

    Rack units
    One — stated in the title and in the third bullet, which says the 1U shelf maximises the available space and improves air circulation
    Mounting depth
    270 mm — stated in the title
    Cantilever or four-post support
    Not published on the listing — the second bullet claims universal compatibility with 19-inch rack frames and a quick installation without special tools, and no bullet says whether the shelf is carried at the front alone or at both ends
    Stated load rating
    Not published on the listing — no weight figure appears anywhere. The title calls the shelf heavy-duty steel sheet and the first bullet describes a robust construction giving a stable and secure platform, without naming a load. Six of the seven shelves here publish a figure
    Vented or solid surface
    Not published on the listing — no perforation and no vent is named. The third bullet credits the shelf with improving air circulation without saying how, and the fourth describes the usable dimensions rather than the surface
    Sliding or fixed
    Not published on the listing — no bullet says whether the shelf bolts in place or runs on slides. The second describes a quick installation and the fifth a solid steel construction with a black coating
    Usable surface dimensions
    480 mm usable width and 265 mm usable depth — stated in the fourth bullet, which offers the shelf for network hardware and audio-visual equipment alike. Two of the seven shelves here publish a usable figure and this is one of them
    Fixings supplied
    Not published on the listing — no screws, cage nuts or washers are listed. The second bullet says the installation is quick and needs no special tool, which describes the effort rather than the contents
    Amazon reference
    B0DDTGFMGM (same reference on 6 Amazon marketplaces)
    EAN
    4063328058241
    • Publishes a usable width and a usable depth, which five of the seven shelves here never do
    • Two hundred and seventy millimetres of depth, more than the two cheaper shelves offer
    • Called heavy-duty in the title with no load figure anywhere on the page

    Best for: A cabinet where the shelf has to be measured before it is bought, and the weight going on it is modest and already known.

    ≈ 18 €
    Check price on Amazon
  • Koscom Connect black perforated 19-inch 1U pull-out rack shelf

    KOSCOM CONNECT 19-inch 1U sliding shelf, 483 × 350 × 45 mm, rails adjustable 350–505 mm, 5 kg

    A tray that comes out of the cabinet instead of staying in it, which is the whole argument for it — and a five-kilogram limit, which is the price of the mechanism.

    Rack units
    One — stated in the fourth bullet, which gives the dimensions as 48.3 × 35 × 4.5 cm for a 1U pull-out tray
    Mounting depth
    For cabinets from 450 mm depth — stated in the first and fourth bullets, the latter giving the range as 450 mm up to 600 mm. The third adds that the spacing of the profile rails is adjustable in depth from 35 to 50.5 cm
    Cantilever or four-post support
    Not published on the listing — the third bullet says the tray installs on the profile rails of the rack with an adjustable rail spacing, and no bullet names a post count or says whether the rear is carried
    Stated load rating
    Maximum 5 kg — stated in the second bullet. It is by a wide margin the lowest figure on this shelf, where the fixed trays run from about 15 kg to 110 kg
    Vented or solid surface
    Vented — the second bullet describes high-grade perforated sheet, stable and able to withstand high loads while allowing passive cooling
    Sliding or fixed
    Sliding — stated in the title and in the first bullet as a pull-out tray, offered for components that cannot be rack-mounted and for easier access. It is the only sliding shelf in this hub
    Usable surface dimensions
    Not published on the listing — the fourth bullet gives 48.3 × 35 × 4.5 cm as the dimensions of the tray, which are outer figures. No separate surface measurement appears
    Fixings supplied
    Not published on the listing — no screws, cage nuts or washers are listed. The third bullet says the tray installs easily on the profile rails and names no hardware
    Amazon reference
    B0D96B839H (same reference on 6 Amazon marketplaces)
    EAN
    4043089462211
    • The only shelf in this hub that pulls out, which is the difference between reading a label and moving a cabinet
    • The rail spacing adjusts across 155 mm, from 350 to 505 mm
    • Five kilograms, a third of the 15 kg a fixed tray here carries

    Best for: A cabinet holding something that has to be reached rather than merely stored — a small drive, a console, a labelled patch record.

    ≈ £45 / 35 €
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  • HMF black 19-inch 1U rack shelf with front mounting flanges

    HMF 19-inch 1U shelf, 300 mm mounting depth, 483 × 300 × 44 mm, 16 kg, cage nuts included

    The shelf that describes its own installation most precisely — fixing points on the front face, at one rack unit — and publishes its own weight alongside the load it will carry.

    Rack units
    One — stated in the title and in the fourth bullet, which puts 1 HE in brackets after the description of the fixing points
    Mounting depth
    300 mm — stated in the title as the installation depth, and in the first bullet as a requirement: the shelf suits 19-inch cabinets offering at least 300 mm of mounting depth
    Cantilever or four-post support
    Neither term is used, and the fourth bullet describes the arrangement plainly: a quick installation on the profile rails thanks to fixing points on the front face. A shelf carried at the front alone is what the cantilever entry in this table describes, and the listing does not use the word
    Stated load rating
    About 16 kg — stated in the fifth bullet alongside the dimensions and the weight. The word about is the maker’s own
    Vented or solid surface
    Not published on the listing — no perforation, no vent and no airflow claim appears in any of the five bullets. The third describes stable steel sheet with a scratch-resistant black powder coating
    Sliding or fixed
    Fixed — stated in the first bullet as a shelf for fixed installation, and confirmed by the fourth, which describes it bolted to the profile rails
    Usable surface dimensions
    Not published on the listing — the fifth bullet gives 483 × 300 × 44 mm as the width, depth and height of the shelf, which are outer dimensions. No separate figure for the flat surface appears
    Fixings supplied
    Cage nuts — named in the fifth bullet as the accessory. No screws and no washers are listed alongside them
    Amazon reference
    B09F1DQCSD (same reference on 5 Amazon marketplaces)
    EAN
    4010537659929
    • Describes the fixing arrangement in plain words, which five of the seven shelves here never do
    • Publishes its own weight, 1.44 kg, as well as the load it carries
    • Nothing says whether the surface is perforated, and this is a cabinet part

    Best for: A 19-inch cabinet of at least 300 mm depth holding a modest, awkward object that needs a stable platform and nothing more.

    ≈ 21 €
    Check price on Amazon

All rack cooling fans