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t-NEXT DF DX
T_tNEXTDFDX_0719_EN
85
MEHITS S.p.A.
DATA BOOK
EXAMPLE FOR MACHINES NOISE EMISSION CALCULATION
IMPORTANT
The declared noise levels are intended in free field conditions.
The noise pressure level of an installed unit is affected by the room acoustic characteristics.
Please consider an average noise increase of +4/+6 dB(A).
OVER MACHINE WITH PLENUM ON AIR DELIVERY
Lp
A
= Air intake Over catalogue value
Lp
B
= Air delivery Over catalogue value
–
plenum noise reduction
Lp
A+B
= 10 log
10
(
10 +10
)
LpA
10
LpC
10
OVER MACHINE WITH DUCT AND PLENUM ON AIR DELIVERY
Lp
A
= Front side Over catalogue value
Lp
B
= Air delivery Over catalogue value
Lp
C
= Lp
A
+ 6dB(A)
–
plenum noise reduction
Lp
A+C
= 10 log
10
(
10 +10
)
The point
B
do not influence the point
A+C
LpA
10
LpC
10
OVER MACHINE WITH DUCT AND PLENUM ON AIR DELIVERY
Lp
A
= Front side Over catalogue value
Lp
B
= Air delivery Over catalogue value
Lp
C
= Lp
D
= Lp A + 6 dB(A)
–
plenum noise reduction
The points
B, C
and
D
do not influence the point
A
Blind front panel
Blind front panel