BESF box fan

Description

The BESF box fan is a fan with forward-curved F impeller and sound-damping insulation. BESF is available in 7 sizes: BESF146, -160, -180, -200, -225, -250, and -280.

For most sizes, a model with EC motor can be selected for more efficient operation. See more under Capacity - and find technical data for the different sizes under BESFxxx Technical Data. 

Temperature

In normal operation, tolerates temperatures up to 60 °C.

BESF146 - BESF180 tolerate temperatures up to 200 °C for 60 min. in case of fire and BESF200 - BESF280 tolerate temperatures up to 300 °C for 60 min. in case of fire. 

If there is a need for a certified smoke extraction fan, we draw your attention to the FSB box fan, described under the product group Fire Protection

BESF box fans

BESF box fan

Design
	BESF box fans are made from Aluzinc® AZ185 class C4 in accordance with EN/ISO12944-2 and insulated for sound and condensation with 30 mm mineral wool. As standard, BESF can handle gas temperatures up to 60°C. When used as a smoke extract fan: BESF146-180 can as standard cope with up to 200°C for 60 min. As standard, BESF200-280 can handle up to 300°C for 60 min.

Fan impeller
	The fan impeller is an F-impeller made from galvanised steel. It has forward-curved blades, which means that the box fan is able to generate a high pressure for its compact size.

Spigots
	The spigots on BESF have rubber gaskets to ease mounting of ducts.

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

OGSR transition piece
	To minimise system pressure drop when connecting to a duct system, we recommend the use of an OGSR transition piece (accessory). OGSR is a specially developed circular transition piece with integral guide panels; it can be supplied for BESF200, 225, 250 and 280 and allows maximum capacity and efficiency to be achieved. OGSR is not available with other BESF models.

BESF box fan

BESF box fans have their motor connected directly to the fan impeller.

BESF box fans are available with two types of motor:

- EC motor
- Single-phase AC-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 BESF is a permanent-magnet motor of class IE5 (BESF25041EC: IE4) 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 fan. 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 AC-motor:

Single-phase AC-motors can be selected for BESF146 and BESF160. 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).

BESF box fan

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

Standard installation: A

Alternative installation options B/C/D:

During installation, consideration must be given to opening the door for servicing and for 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 fan should not be screwed onto the supporting base. The base must be stable and vibration free, with no sagging. 

BESF

As standard, BESF can handle gas temperatures up to 60°C.

Flue gas resistance

BESF box fan

FLF Flexible connector
	FLF flexible connector is made from reinforced glass fabric with integral clamps. FLF is fitted directly onto EXHAUSTO box fans as a coupling to the fan ducts and minimises any possibility of vibrations moving along the duct system.

THA/THAV Roof terminal
	Roof terminals THA and THAV are designed for air exhausts from EXHAUSTO box fans 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.

OGSR transition piece
	To minimise system pressure drop when connecting to a duct system, we recommend the use of an OGSR transition piece. OGSR is a specially developed circular transition piece with integral guide panels; it can be supplied for BESF200, 225, 250 and 280 and allows maximum capacity and efficiency to be achieved. OGSR is not available with other BESF models.