9
6-96
Optima™, Omega™ & Glass Bulb Residential Sprinkler
Design and Installation Guide
Figure 9
Obstruction to Discharge by Inter-
secting Flat Ceiling
If “D” is “Obstructed” per Figure 9 Graph, then “D” is to be
considered the area of coverage and additional sprinklers
along the horizontal ceiling will be necessary. Only if “D” is
“Acceptable” can “A” be considered
1
⁄
2
of the maximum
Listed spacing that the sprinkler was calculated for. Di-
mension “A” is measured along the slope.
D
F
A
A — Maximum
1
⁄
2
of the Listed spacing that the sprinkler
was calculated for.
D — Distance to intersecting horizontal ceiling.
F — Acceptable for angles 0
°
to 60
°
.
Figure 9 Graph
0
°
4
°
8
°
12
°
16
°
20
°
24
°
28
°
32
°
36
°
40
°
44
°
48
°
52
°
56
°
60
°
"D"
(in feet)
"F"
(in degrees)
Obstructed
Acceptable
10'
9'
8'
6'
5'
4'
3'
2'
7'
20' x 20'
18' x 18'
16' x 16'
14' x 14'
12' x 12'
Figure 10
Obstruction to Discharge by an Oppos-
ing Sloped Ceiling
If “D” is “Obstructed” per Figure 10 Graph, then the hori-
zontal distance to the opposing slope is the extent of
coverage and additional sprinklers will be necessary to
protect the remainder of the opposing slope. Only if “D” is
“Acceptable” can “A” equal
1
⁄
2
of the maximum Listed
spacing that the sprinkler was calculated for. Dimension
“A” is measured along the slope.
A
D
A
G
F
A — NFPA minimum of 4", maximum
1
⁄
2
of the Listed
spacing that the sprinkler was calculated for.
D — Distance to opposing sloped ceiling.
F & G — Acceptable for angles 0
°
to 60
°
.
5'
4'
3'
2'
1'
"D"
(in feet)
"F" or "G"
(whichever is greater)
(in degrees)
Obstructed
10
°
15
°
20
°
25
°
30
°
35
°
40
°
45
°
Acceptable
20' x 20'
18' x 18'
16' x 16'
14' x 14'
12' x 12'
Figure 10 Graph
OBSOLETE
