Engineering, Project Management & Manufacturing site

From small cabinet to big shelters turnkey solutions


Celantel S.r.l. was established in 2000 by Enzo Celant as a continuation of a bet, which began more than forty years ago, focused in the field of the passive air conditioning of electronic equipment housings.
This continuous path enabled Celantel to face the most various problems introducing innovative and completely new solutions, as the passive cooling, in order to complete the most challenging projects arising in the market, starting from BAM project USSR (arctic shelter) and Ford Project Morocco(desert shelter).
The Company, with management and engineering offices in Vimercate (MB), can rely on a staff of 12 experts: ex-colleagues with proven ability and high competences. Whereas the manufacturing and testing activities are performed in two different sites: Parma for the actively and passively cooled shelter and Carnate (MB) for the racks and the metallic passive cabinets.
Celantel trusts, for its future, on the results of the research activities, engaging significant resources to the achievement of ambitious goals. All Celantel passively cooled products are patented. To date, Celantel has manufactured and supplied more than 1.000 shelter for the Middle East, Africa and Australia geographical areas.


Devices able to control the temperature without any energy consumption and maintenance.

The idea of the Passive Shelter - Reliability and Advantages
The idea for this invention arose, during the 70’s, from the staff of Mr. Celant in Telettra, to face the necessity to provide the remote telecommunication stations of air conditioning systems that did not need any extra electrical power in addition to the one assigned to the equipment.
This brought to the development and the realization of devices, integrated to the shelter, able to transfer outside the heat generated inside the equipment housing, without energy consumption and maintenance, granting and increasing of the whole reliability.
Following this trail, Celantel has developed and implemented projects that allowed to increase their performances and their ease use, with a consequent impact on the costs and the application fields range.

No energy consumption, necessary for the air conditioning, (or highly reduced).

Considerable increase of the global reliability due to the absence of mechanical moving parts and fluids under pressure. No maintenance required thanks to the sealed and "elastic" hydraulic circuit, refills free.

The devices are housed in a room without direct air entrance and with a temperature control without sudden jumps.

Passive cooled cabinet & Passive cooled Shelter.

Operating criteria - The Thermal Diode and the Thermal Condenser
In order to make the air conditioning independent from any energy source, it is unavoidable to draw to the energy made available by the environmental climatic conditions. As a matter of fact the passive system employs the thermal energy available during the night, moving and collecting it inside and releasing it during 24 hours.
Celantel uses a patented device having two peculiarities: it is perfectly sealed so that it doesn’t need any refilling during the operational stage and it is modular type. A fluid is employed as thermal vector and store function.
Every passive shelter is divided into two stages:
-The tank/Internal heat exchanger.
-The external heat exchanger.

The tank/internal heat exchanger has the function to control the internal thermal energy and thanks to a suitable accordion shape and a position, that is functional to the thermal flows, allows the expected heat absorption. In certain circumstances, the store function is integrated by adding specific products i.e. Phase Change Materials (PCM).
Typically positioned on the top of the shelter or at the top of the cabinet, such as to make easier the cleaning, the external heat exchanger is configured in order to maximize the heat exchange through the conduction toward the environment and through the radiation toward the outer space, introducing in this way a nocturnal sub cooling effects.

The passively cooled shelter follows the operational procedures of a diode (thermal), allowing the internal heat transfer toward the external and not vice versa.
The heat generated by the internal systems, added up to the contribution due to the environmental stress, is accumulated in the tank through the internal tank/exchanger, warming in this way the liquid stored inside.
The fluid inside the external exchanger cools down, starting the circulation process in the closed circuit (natural convention), till its complete regeneration.
Project Criteria
The calculation method is essentially based on the difference between the minimum external night temperature and the maximum inside temperature allowed by the electronic devices.
This calculation uses a complex algorithm developed by Celantel that, depending on the specific temperatures of the concerned places, which are certified by the global databases, or according to the project requirements, it allows an accurate evaluation of all the manufacturing parameters of the passively cooled shelter, providing the graphics of the performance expectations.


When the air conditioning does not depend on the energy supply – ZERO ENERGY

It is characterized by:
・Watertight internal room.
・Absence of moving mechanical parts.
・Absence of pressurized fluids.
・Hydraulic circuit perfectly sealed (watertight).
The application concerns the remote stations, or the applications with no maintenance.
When the air conditioning is partially depending on the energy supply – ENERGY SAVING
The application is referring to high heat dissipation stations. It keeps all the characteristics of the passive shelter and it ensures a limited energy consumption and maintenance. There are three subcategories of product, suitable for fixed or mobile stations.

High capacity Semipassive

This system is derived from the passive shelter with water circulation facilitated by a pump and internal or external forced ventilation to increase the heat exchange. It allows high heat dissipations maintaining, at the same time, the characteristics of low maintenance and consumption.


Passive cooling system supported by an auxiliary air conditioner or chiller, which will be activated only during the warmer months of the year.

Three ways Semipassive

Made up of a three ways heat exchanger, it is equipped with storage and forced ventilation. It ensures a temperature control with low power consumption This compact size module allows an optimization of the internal spaces of the shelter and the installation on existing shelter, already in field, to replace the traditional air conditioning.

When the air conditioning uses electrically activated systems and/or devices allowing the air inlet / outlet.

It is characterized by:
・Temperature control fully managed by an air conditioning.
・Ventilation with direct air input.
・It allows split units installation, integrated or roof type.

Manufactured with unframed composite panels shelter body (Fiberglass or Aluminum) or with framed container type steel structures.

The use of these systems has no limits.
The Celantel’s aim is to extend its use in applications so far managed with the traditional systems.
However the most common applications are in the following fields:

・Oil Gas On-shore and Off-Shore.
・Railways: stations for train control.
・Highways: stations for traffic control, visibility and other.
・RBS networks mobile stations.
・Radio-link, optical fiber stations.
・Climatic and environmental monitoring stations.
・Air traffic monitoring stations.
・Electronic housings for airports.
・Electrical stations and substations and transformers housing.
・Analysis cabins.
・Satellite stations.
・Broadcasting radio tv.
・Central archives.
・Rack Server.


There are two different kind of housings:
Cabinet (with direct access to the equipment without a “walk-in facility”).
Shelter (with “walk-in facility” internal access).

Construction technology
The Shelter body or Cabinet is made up of an original compound structure, without metal frame, always with six multilayer monolithic panels created through a pressing molding process and controlled temperature.
Each panel has two external Glass Fiber Reinforced Plastic (GRP) or Metal “skins” and an extruded panels heart of expanded polystyrene or mineral wool.

Constructive qualities
Easy and fast to be repaired.
Total lack of welding.
No GRP painting (gel coat).
No maintenance. Sea packing not necessary.
Solar panel not necessary.
Suitable for installations in desert or arctic areas.

Technical characteristics
・Resistant to corrosion and acids attack (GRP)
・Highly accurate thermal insulation.
・Absence of thermal bridges and condensation areas.
・IP65 or IP66 protection.
・Resistance to the fire from the M2 to the REI120 class.
・Temperature application from -50°C to + 60°C.
・Very high intrinsic electrical insulation of the all structure with the use of dielectric materials.
・Integrated metal reinforcements for the equipment fixing on the walls.
・Roof load 500 kg/m2 and pressure resistance of the walls (pressure test up to 160 kg/m2).
・Scratching resistance and dent resistance ASTM D 256.
・No protrusion, absence of screws, rivets or junction metal elements.
・Possibility of openings with no position or width limits.
The Celantel engineering draws, sets up, and supplies the product, according to the project specification, complete with:

・Customized electrical system.
・Internal and external lights system.
・Distribution panel for services and/or customer devices.
・Continuous power supply system (UPS).
・Sealed cables passage and special wiring.
・Photovoltaic and Aeolian systems.
・Redundancies and ventilation management. Management logics development.

・Smoke/fire detection system.
・H2 or other explosive gas detection system.
・Monitoring and alarm recording systems (door, temperature, etc.)
・Active or passive air conditioning monitoring system.
・Alarm signals systems.
・Automatic fire extinguishing systems.

・Active or passive shelter thermal calculations.
・Structural calculations.
・Loads foundation calculations.
・Integrated formulations consultancy.
・Turnkey infrastructures supply.
Climatic Tests
Carried out in a certified thermal chamber, it allows the right evaluation of the device (Cabinet or Shelter) thermal behavior when installed at the final destination site.

Mechanical Tests
Floor load.
Roof load.
Wind resistance.
Door resistance.
Impermeability test.
Electrical Tests
Electrical system test.
Accessories functionality check.
Air conditioning tests.
Wiring insulation tests.
Insulating panel electrical resistance measurement.


Celantel has patented the following air conditioning systems:

Artic Passive Conditioning shelter.
Passive and Semi Passive Conditioning Shelter and Devices.
Passive and Semi Passive Conditioning Outdoor Cabinet and Battery Enclosures.
Fiber Reinforced Plastic (FRP - GRP) Mono block Shelter Panel Construction and Assembling Device.
High Efficiency Tank/Exchanger (for Passive Cooling System).
Load Distribution Device for Roof Top Shelter Application.
Modular Tank / Exchanger.
Modular Polyethylene Tank / Exchanger.
Passive Cooling Device for telecom Shelter.
Metal / Polyethylene External Heat Exchanger.
Passive and Semi Passive Cooling Module to be fitted in equipment shelter.
Passive Cooling System integrated in equipment shelter and /or Cabinet.

The unique and patented Modular Polyethylene tank exchanger grants:
・the highest protection against the corrosion.
・a sealed hydraulic circuit without air breather with volume variations compensated directly in the tank.


Celantel has been working in over 100 international projects, collaborating with the most
important telecommunication companies, oil & gas and with the major international contractors such as:

Celant.Tel cetificata ISO 9001 : 2000

  • Adco
  • Aramco
  • Gasco
  • TwistNESMA
  • Trading Co
  • Petrofac
  • International LTD
  • BP&T
  • International
  • STC
  • Descon
  • Sonatrach Co
  • NEC
  • INEO
  • PDO
  • Engineering Co
  • Development
  • Company (IDC)
  • CAT
  • Eni-Saipem
  • TSS4
  • FRAMES Energy
  • Systems
  • Yandalux GmbH
  • NPCC
  • SYS.CO
  • Thales
  • General
  • Dynamics


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cabinet metallici

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cabinet vetroresina

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cabinet interrati

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shelter passivi

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shelter attivi

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shelter semipassivi

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shelter interrati

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batteri box

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shelter in kit

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Tel. +39 039 608 42 17
Tel. +39 039 661 19 79
Fax. +39 039 608 42 13
Skype: EnzoCelant
Via Francesco Vigo Pellizzari, 28
20871 Vimercate (MB)