Siemens Industry, Inc.
Building Technologies Division
3
P/N 315-049708-5
Figure 2
Recommended Locations in Duct Systems
RETURN
AIR
SUPPLY
AIR
AIR DUCT
HOUSING
AIR DUCT
HOUSING
DAMPER
BLOWER
FILTER
PLENUM
FRESH AIR INTAKE
DAMPER
TYPE A: CLOSED SYSTEM - NO EXHAUST
D
D
TYPE B: PROVISION FOR EXHAUSTING
SOME PERCENTAGE OF RETURN AIR
RETURN
AIR
SUPPLY
AIR
AIR DUCT
HOUSING
AIR DUCT
HOUSING
DAMPER
DAMPER
BLOWER
FILTER
PLENUM
FRESH AIR INTAKE
DAMPER
D
D
EXHAUST AIR
OUTPUT
DAMPER
TYPE C: RETURN AIR UNDER POSITIVE PRESSURE
FROM SEPARATE BLOWER
EXHAUST AIR
OUTPUT
DAMPER
RETURN
AIR
SUPPLY
AIR
AIR DUCT
HOUSING
RETURN AIR
BLOWER
AIR DUCT
HOUSING
DAMPER
DAMPER
BLOWER
FILTER
PLENUM
FRESH AIR INTAKE
DAMPER
D
D
Figure 1
Typical Mounting of Duct Housing
OUTLET
TUBE
INPUT
SAMPLING
TUBE
CENTER
LINE
OF DUCT
CL
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