Hoval RoofVent CON-9, Design Handbook

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15 Acoustic cowl
The acoustic cowl reduces the noise level in the room; it is
installed in the Air-Injector. This does not change the outside
dimensions of the Air-Injector.
The insertion attenuation amounts to 4 dB with respect to the
total sound level of the respective RoofVent
®
unit.
16 Actuators with spring return
In the event of a power failure, actuators with spring return
close the fresh air damper and, if there is one, the ER
damper, and thus protect the unit from frost. They are
installed in place of the standard actuators.
Type SMF
Supply voltage AC 24 V
Frequency 50 Hz
Input signal DC 0…10 V
Torque 20 Nm
Run time of actuator 150 s
Run time of spring return 20 s
Table K25: Technical data for the actuators with spring return
Fig. K4: Actuator with spring return
17 Air outlet box
When using the RoofVent
®
units in low-roofed halls, the air
outlet box can be installed in place of the Air-Injector. This
reduces the minimum mounting height by 1 m compared to
the standard design.
The air outlet box has horizontal exhaust air grilles on all
sides. The vanes can be manually adjusted without tools to
adapt the air discharge angle to the local conditions.
Note
The air outlet box replaces the Air-Injector. The total
height of the unit is somewhat smaller; the weight is
approximately the same.
R
Q
Type AK-6 AK-9/10
R mm 900 1100
Q mm 350 400
Weight kg 36 53
Table K26: Dimensions and weights of the air outlet box
Options
Acoustic cowl