Arjo Tornado - Example

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5.7.2 Example
The calculated sound power level implies di󰀨erent sound levels L
pA
in di󰀨erent types of space. With larger room volumes, the sound
level decreases slightly and with smaller room volumes it increases
slightly.
The table below shows examples of what sound level to expect in
practice. The room types used in the example are:
• Hard sound: All surfaces of tile, plaster, concrete or similar,
i.e. no sound absorbents and no furniture.
• Normally-damped: Some sound absorption in the form of
furniture and textiles.
• Dampened: Full-cover ceiling absorbent and some furnishing
with tables, chairs and textiles.
Calculated sound level L
pA
in a 70 m
3
room, dB ref 20 µPa.
Type of room Operator position* 3 meters from the
machine
Hard sound 60/60 60/60
Normally-damped 56/56 55/55
Damped 53/53 51/51
* The term operator position means 1 m from the machine and
1.5 m above the oor.