3
Park, Quincy, Massachusetts.) The detector on the return air side of the
blower should be located at a point prior to exhausting air from the building
or diluting return air with outside air. The detector on the supply air side of
the blower should be downstream of the blower.
Wire or program the detectors into the system so that they automatically shut
down the blowers and operate dampers as required in the event of an alarm.
Figure 2
Recommended Locations in Duct Systems
Mounting of the Air Duct Housing (See Figure 3)
a.
Affix the adhesive backed gaskets (Item 1) to the back of the detector
housing (2) so that the larger hole on the gasket lines up with the sam-
pling tube hole on the sampling chamber and the smaller hole lines up
with the housing mounting hole.
b.
Affix the adhesive backed template (5) to the side of the ductwork.
c.
Drill the four 0.110 diameter holes with a No. 35 drill bit and cut or
punch out two 7/8-inch diameter holes as indicated on the template.
d.
Attach the appropriate model housing to the air duct using two No. 10
1
1
/
2
inch screws (6) and also using two No. 10 1-inch screws (7) with
lockwashers (8).
e.
Cut a 12 inch by 12 inch access hole in the duct adjacent to the hous-
ing to permit checking and cleaning of the sampling tubes. The ac-
cess hole must be covered and sealed when not in use.
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