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16
External Venting for Debris Removal System
If the external venting option is chosen for the debris removal system, the piping
connected to the end of the debris cabinet hose shall be limited to one of:
1.
2 in. pipe (maximum Schedule 40)
•
maximum length = 45 m (150 ft.)
•
maximum number of 90
OR
2. 2 1/2 in. pipe (maximum Schedule 40)
•
maximum length = 105 m (350 ft.)
•
maximum number of 90
OR
3. 3 in diameter or larger ducting
•
maximum length = 240 m (800 ft.)
•
maximum number of 90
Note: Option 3 is not recommended due to sealing issues. It may be used if there is an
exhaust fan installed that ensures a vacuum within the ductwork at all times (the
minimum flow of the exhaust fan must be greater than 35 SCFM).
The piping material may be galvanized steel, painted carbon steel, PVC, or a similar
suitable material.
All joints and unions from the hose coupling to the exhaust/exit of the external
venting piping shall be properly sealed along their length to prevent ingress or
egress or any gas or liquid. Before initial startup, it is recommended that a pressure
test be performed to ensure that this requirement is met.
The exhaust/exit of the external venting piping will be free to the exterior of the
building, without any restrictions. Adequate non-restrictive weather protection shall
be installed as required. The exit of the external venting piping must be regulated to
ensure that no flow occurs when the debris cabinet is not in operation (i.e., back-
flow prevention).
The customer shall supply a coupling to connect the external venting piping with the
1.5 in ID hose from the debris cabinet. This coupling should install by simply slipping
the hose over a braided section of it and securing it with a hose clamp.
Connecting to an Existing Ventilation System
If the customer already has a ventilation system that exhausts to the exterior of the
building (such as a processor exhaust system), the venting piping for the debris
system may be joined to it. The end of the debris system venting pipe should be
mated to the exhaust vent upstream of the ventilation fan, as follows:
PROCESSOR
DEBRIS CABINET
The limitations on pipe length described above apply.
WARNING: The exhaust fan for processor ventilation must be ON at the same as the
debris removal system is ON (i.e., whenever the imaging device is operating). Failure to
ensure this may result in air that has not been chemically treated entering the facility.
ThermoFlex Wide II Site Preparation Guide
o
bends/elbows = 1 per 3 m (10 ft.)
o
bends/elbows = 1 per 3 m (10 ft.)
o
bends/elbows = 1 per 3 m (10 ft.)
INLET FROM
VENTING FAN
EXTERIOR
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