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If the ceiling slopes only slightly (N <0.5), the monitoring beam in the gable is unnecessary
When the sides of the roof are unequal,
With sloping ceilings the smoke is channeled into the gable, resulting in an increased smoke concen-
tration in this area. Therefore, the monitoring width for each PBA-1191 can be increased according to
Figure 23.
1/3
Both distances are determined by height of the room
the unit must be displaced from the
center towards the less steep side.
Positioning underneath unequal sloping ceilings
1/6
1/6
1/3
Figure 13
(See Figure 23.)
Figure 14
PB-1191 Beam Detector Manual
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