Training Manual - NAD Klima

Section 1.6
COMFORT FAC TORS
The sound level
connec tion on diffuser.
• 80% of the air volume passes through 20% of
the sur face
• A diversion of the connec tion of more than
half a times the diameter will increase by 12
to 15 (dB) the sound level.
• The majority of the nor th american
manufac turers consider that 10 decibels (dB)
are absorbed by the while europeans consider
a sound level net in the occupied area.
• Ex tremely quit diffuser
• I nstallation of plenum per forated plate :
- Allows the blooming of air by reducing the
air speed
- On the inside, a per forated plate is to
already reduced by the plenum)
• Eccentric c ylinders
to the eccentric c ylinders.
(b)
2’
80%
of air
20%
in cooling