Kidde Fire Systems DS Series, Application Manual

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July 2016 -13- K-76-1000
Ceiling Height and Construction
Make spacing adjustments when installing DS-HFS heat detectors on other than flat smooth ceilings or at
ceiling heights 10 ft. (3 m) to 30 ft. (9.1 m) high. The table below shows the reduction in spacing required
when mounting the DS-HFS detector on ceilings higher than 10 ft. (3 m). This reduced spacing yields the
equivalent response of detectors located on a 10 ft. (3 m) ceiling. Evaluate ceilings above 30 feet carefully
with consideration to the best placement and spacing.
Sloping Peaked-Typed Ceilings
In rooms with sloping peaked-typed ceilings (refer to Figure 5), place the first row of DS-HFS detectors
within 36 in. (910 mm) horizontally of the peak, but not closer than 4 in. (100 mm) vertically to the peak.
Space additional DS-HFS detectors, if required, based upon the horizontal projection of the ceiling and
ceiling construction. For a ceiling slope of:
•
Less than 30 degrees, space the detectors using the height at the peak.
• Greater than 30 degrees, space the detectors, other than those located in the peak, based on the av-
erage slope height or the height of the peak.
Figure 5. Heat or Smoke Detector Spacing for Sloping Peaked-Type Ceilings
Ceiling height
Percent of
listed
spacing
Spacing Between DS-HFS Detectors
0 to 10 ft. (0 to 3.0 m) 100 20.0 ft. (6.0 m) 50.0 ft. (15.3 m)
10 to 12 ft. (3 to 3.7 m) 91 18.2 ft. (5.5 m) 45.5 ft. (13.9 m)
12 to 14 ft. (3.7 to 4.3 m) 84 16.8 ft. (5.1 m) 42.0 ft. (12.8 m)
14 to 16 ft. (4.3 to 4.9 m) 77 15.4 ft. (4.7 m) 38.5 ft. (11.7 m)
16 to 18 ft. (4.9 to 5.5 m) 71 14.2 ft. (4.3 m) 35.5 ft. (10.8 m)
18 to 20 ft. (5.5 to 6.0 m) 64 12.8 ft. (3.9 m) 32.0 ft. (9.8 m)
20 to 22 ft. (6.0 to 6.7 m) 58 11.6 ft. (3.5 m) 29.0 ft. (8.8 m)
22 to 24 ft. (6.7 to 7.3 m) 52 10.4 ft. (3.2 m) 26.0 ft. (7.9 m)
24 to 26 ft. (7.3 to 7.9 m) 46 9.2 ft. (2.8 m) 23.0 ft. (7.0 m)
26 to 28 ft. (7.9 to 8.5 m) 40 8.0 ft. (2.4 m) 20.0 ft. (6.0 m)
28 to 30 ft. (8.5 to 9.1 m) 34 6.8 ft. (2.1 m) 17.0 ft. (5.2 m)
Note: Ceiling heights higher than 30 ft. (9.1 m) exceed the limits of the
testing for the requirement of the code.
1. Do not mount detector in this area
2. Mount detector anywhere in this area
3. Heat or smoke detector S = Listed spacing between DS-HFS detectors
= 50 ft. (15.2 m)
3 36 in. (910 m)
4 in.
(100 m)
36 in. (910 m)
1/2 S ½ S S
1
2