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STEP 4. INSTALL INLET TUBE
The inlet tube (shown in Figure 3) is identified by a series of air inlet holes on the tube. This tube must be purchased sep-
arately. Order the correct length, as specified in Table 1, for the width of the duct where it will be installed. The exhaust
tube is molded into the base of the duct housing.
The inlet tube should be installed in the inlet sampling tube bushing located in the center of the duct detector housing.
(See Figure 2A.) The air inlet holes must face into the air flow. To assure proper installation, the tube mounting flange is
marked with arrows. Mount the inlet tube so that the arrows point into the air flow. Figure 4 shows the various combina-
tions of duct detector and tube mounting configurations with respect to air flow.
A78-2047-00
DIRECTION
Figure 4. Tube Mounting Configurations with Varying Air Flow Direction and Orientation of Detector Housing.
A. INSTALLATION FOR DUCTS LESS THAN 8 (2.4 M) FEET WIDE
1. If the inlet tube is longer than the width of the air duct, drill a 3/4-inch (19 mm) hole in the duct directly opposite the
hole already cut for the inlet tube.
If the inlet tube is shorter than the width of the air duct, install the end cap into the inlet tube as shown in Figure 3.
2. Slide the inlet tube into the bushing located in the center of the duct housing. Position the tube so that the arrows
point into the air flow.
3. Secure the tube flange to the housing bushing with the two #6 self-tapping screws.
4. For tubes longer than the width of the air duct, the tube should extend out of the opposite side of the duct. If there
are more than 2 holes in the section of the tube extending out of the duct, select a different tube length using Table
1. Otherwise, trim the end of the tube protruding through the duct so that 1 to 2 in (25 to 51 mm) of the tube extends
outside the duct. Plug this end with the tube end plug and tape closed any holes in the protruding section of the tube.
Be sure to seal the duct when the tube protrudes.
5. Any inlet tube over 3 ft (91 cm) long must be supported on the opposite side of the duct detector housing.
H500-03-00
AIR HOLES
FLANGE
ARROWS
MUST FACE
INTO AIR FLOW
Figure 3. Air Duct Detector Inlet Sampling Tube.
DOTS INDICATE POSITION OF
AIR FLOW
DUCT
DETECTOR
HOUSING
INLET
EXHAUST
TUBE
TUBE
INLET
EXHAUST
TUBE
TUBE
DUCT
DETECTOR
HOUSING
AIR FLOW
DIRECTION
Vertical as well as Horizontal Mounting is Acceptable.
AIR FLOW DIRECTION
SAMPLING TUBE HOLES
EXHAUST
TUBE
AIR FLOW
DIRECTION
EXHAUST
TUBE
4
INLET
TUBE
END
PLUG
AIR FLOW
DIRECTION
DUCT
DETECTOR
HOUSING
INLET
TUBE
DUCT
DETECTOR
HOUSING
INLET
TUBE
A78-1812-01
I56-475-09R
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