Safety Features; Structural Design Ajr/Aj8 - SystemAir Jet-Ventilatoren Montageanleitung

6

Safety Features

The standard motors are equipped with thermic protection provided by PTC resistors. Versions for smoke extraction are
excluded.
7

Structural Design AJR/AJ8

The fan is a directly operated axial fan where the motor is seated directly in the airstream. The main direction of air intake
is over the motor.
The external casing of the fan forms an elongated housing made of galvanized sheet steel that has a pressed-on fl ange
with bore holes. The fan has silencers on both the inlet and pressure sides. The silencers are equipped with retracted nozz-
les and safety guards and made of galvanized steel. The acoustic insulation is non-fl ammable in accordance with DIN 4102
as described in Council Directive 97/69 EC. For optimal guidance of the air current, a defl ector made of galvanized sheet
steel can be mounted on the pressure side silencer (accessory).
Mounting brackets made of galvanized sheet steel are installed on the fan at the factory.
Model AJ8
AJR
•
In the standard versions, the fans are equipped with three-phase motors (400 V, 50 Hz) with built-in PTC resistors.
The electric motor has IP 55 protection and isolation class F, while the smoke extracting fans have IP 55 protection
and isolation class H. The two-speed version is available with a motor with tapped winding (Dahlander motor).
• The motor with impeller is mounted to a sturdy supporting structure made of galvanized sheet steel.
• The axial fan is made of a cast aluminum alloy and is equipped with molded blades and an effi cient hub ratio. The
hub design permits infi nite adjustment of the blade angle when the impeller is halted.
• The electrical connection is made through a terminal box installed on the outside of the housing. Standard version:
polypropylene; protection rating: IP 65. The smoke-extracting fan (B) and (F) is made of cast aluminum alloy with IP
65 protection.
Main Components of Jet Fan with Accessories
Pos. 1 Diffuser system
Pos. 2 Safety guard
Pos. 3 Infl ow duct
Pos. 4 Silencer, pressure side
Pos. 5 Terminal box
30
- octagonal version
- round version
Pos. 6 Impeller
Pos. 7 Motor
Pos. 8 Motor base plate
Pos. 9 Fastener
Pos. 10 Silencer, intake side