BESB box ventilators

BESB250 og BESB500
  1. Capacity - overview Add to print

    BESB box ventilators


      Capacity m3/h
      Min. Max.
    BESB250-4-1 300 1840
    BESB250-4-1EC 350 2260
    BESB250-4-3 350  2200
    BESB315-4-1EC 570 3590
    BESB315-4-3 570  3500
    BESB400-4-1EC 950 6000
     BESB400-4-3 900 5180
    BESB500-4-1EC 1180 7300
    BESB500-4-3 2600 7900
    BESB500-4-3EC 1330 10800

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  2. Design Add to print

    BESB box ventilator


    BESB kontruktion

    BESB box ventilators are made from Aluzinc® AZ185 class C4 in accordance with EN/ISO12944-2 and insulated for sound and condensation with 50 mm mineral wool.

    As standard BESB can handle a gas temperature of up to 80°C, but can be ordered in a special version for temperatures right up to 200°C.

    When used as a smoke extract fan, BESB can as standard handle up to 300°C for 60 min.

    Fan impeller

    BESB ventilatorhjul

    The ventilator impeller is a B-impeller made from cast aluminium.

    It has backward curved blades, thus ensuring low energy consumption and the further advantage that less dirt is attracted, with impaired impeller efficiency as a result.


    BESB gummikapning The spigots on BESB have rubber gaskets, with a transition piece on the extract side specially developed for minimum pressure drop.

    Oscillation dampers

    BESB svingningsdæmpere

    To minimise noise and vibration, the box ventilator is fitted as standard with efficient oscillation dampers mounted on brackets.

    Split hinges

    BESB hængsel

    The BESB box ventilator has split hinges, which enable the door to be removed for installation and servicing, even in very confined conditions or for transport to difficult locations.

    Condensation outlet

    TEST 100 100 The BESB box ventilator is designed to transport air with an air humidity of less than 80% RH.

    BESB is available as a special model with a condensation outlet for air with over 80% RH.

    Split version

    BESB split

    If there are problems moving the BESB box ventilator in one piece, it may be ordered in a SPLIT version.

    - The box ventilator must be assembled by an EXHAUSTO-approved fitter
    - The box ventilator must receive final testing before handover by the fitter.

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  3. Energy Add to print

    BESB box ventilator

    The BESB box ventilator is a low-energy ventilator, in which ventilator housing, centrifugal impeller and motor all work together as one technology.

    All BESB box ventilators fulfil the future requirements for 2015 laid down in the Ecodesign Directive EC327/2011.

    BESB is listed by the Danish electrical power utility companies as an 'energy-saving fan'® – that is a highly energy-efficient ventilator.


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  4. Motor types Add to print

    BESB box ventilator

    BESB box ventilators have their motor connected directly to the ventilator impeller.

    BESB box ventilators are available with three types of motor:

    - EC motor
    - single-phase motor
    - 3-phase motor

    The motors are made to protection class IP54 and all materials are as a minimum class F (155 °C). All motor types have integral current overload protection.

    EC motor

    The EC motor for BESB is a permanent-magnet motor of class IE5 with motor control for 1 x 230 V or 3 x 400 V connection. The motor control and the motor are protected from overloading, blocking, over and under voltage, and over heating.

    The motor control is factory programmed by EXHAUSTO for optimal operation of the ventilator. It only requires mains connection and a control signal from an EXHAUSTO EFC1P or MAC12 controller or a 0-10V signal.

    The motor controls also provide a Modbus interface for fan control and alarm read-offs etc.

    Single-phase and 3-phase motor:

    Single-phase motors can be selected for BESB250. All motors are 4-pole with 1400 rpm, and permit direct voltage control using EXHAUSTO controllers EFC16, EFC35 and MAC12 (with MPR4 or MPR8 module).

    3-phase motors can be selected for BESB500. The motor is designed for a fixed rpm of 1400 or for frequency control (max. 50 Hz) by external frequency converter. The 3-phase motors must use external motor protection, or they can be controlled by an external frequency converter (with integral motor protection) to max. 50 Hz. 

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  5. Installation Add to print

    BESB box ventilator

    The box ventilator can be mounted in various positions. Note, however, that the ventilator must not be positioned with the motor turned downwards.

    Standard installation: A

    Alternative installation options B/C/D:

    BESB monteringsmuligheder


    During installation, consideration must be given to opening the door for servicing and to access to door screws (see dimensions table on pages 7 and 15 in the product instructions where opening radius R is given). There should also be enough space to insulate the ducts.

    In installation options B and D, with the door facing upwards, special fittings must be used to hold the door (accessory).

    The box ventilator should not be screwed onto the supporting base. The base must be stable and vibration free, with no sagging. The outdoor model can be installed according to options A and B.

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  6. Accessories Add to print

    BESB box ventilators

    FLF Flexible connector

    FLF Flexforbindelse FLF flexible connector is made from reinforced glass fabric with integral clamps.

    FLF is fitted directly onto EXHAUSTO box ventilators as a coupling to the ventilator ducts and minimises any possibility of vibrations moving along the duct system.

    BFL Brandflex

    BFL Brandflex BFL is made from steel-reinforced glass fabric, ceramic material and silica fibre.
    BFL Brandflex satisfies the fire safety requirements for building components of materials class A2-s1,d0 in accordance with EN13501-1.

    THA/THAV Roof terminal

    THA THAV afkasttaghætter 150 x 100 Roof terminals THA and THAV are designed for air exhausts from EXHAUSTO box ventilators BESB and BESF.

    THA is insulated for condensation and has a horizontal exhaust, while THAV is insulated for both sound and condensation and has a vertical exhaust.

    More information on roof terminals.
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Export Requests:

Odensevej 76
DK 5550 Langeskov

Tel: +45 6566 1236E-mail:

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Ecodesign Directive

EXHAUSTO VEX air handling units and fans comply with the Ecodesign Directive. Read more here.