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The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Telephone: 269-945-9501 Technical Services: 877-384-5464 Fax: 269-818-1680 Email: techsvcs@vikingcorp.com
AVOIDING OBSTRUCTIONS TO SPRINKLER DISCHARGE
(Obstruction rules for residential sprinklers are found in section 8.10 of the 2010 edition of NFPA 13.)
Positioning Residential Pendent Sprinklers - Obstructions at the Ceiling
Positioning Residential Pendent Sprinklers - Obstructions Along Walls
C
Form No. F_080190
18.10.25
B
A
A
4' Max.
A
B
A
Rev 16.1.P65
TECHNICAL DATA
Distance from Sprinkler
to Side of Ceiling
Obstruction (Dimension A)
Less than 1 ft. 6 in.
(Less than 457 mm)
1 ft. 6 in. to less than 3 ft.
(457 mm to less than .94 m)
3 ft. to less than 4 ft.
(.91 m to less than 1.2 m)
4 ft. to less than 4 ft. 6 in.
(1.2 m to less than 1.37 m)
4 ft. 6 in. to less than 6 ft.
(1.37 m to less than 1.8 m)
6 ft. to less than 6 ft. 6 in.
(1.8 m to less than 2 m)
6 ft. 6 in. to less than 7 ft.
(2 m to less than 2.1 m)
7 ft. or greater
(2.1 m or greater)
A
(A) Distance from centerline of sprinkler to side of obstruction.
(B) Distance from deflector to bottom of obstruction.
(C) Width of the obstruction.
Obstructions up to 30 in. (.8 m) wide (C)
located against the wall are permitted
to be protected when (A) is greater than
or equal to (C) minus 8 in. (.2 m) plus (B).
C < 30 in.
A > (C - 8 in.) + B
FREEDOM
RESIDENTIAL
®
SPRINKLER
INSTALLATION GUIDE
Maximum Distance from
Deflector to Bottom of Ceiling
Obstruction (Dimension B)
Inches
0
1
3
5
7
9
11
14
Residential pendent sprinklers may be
located on opposite sides of continuous
obstructions up to 4 ft. (1.2 m) wide at the
ceiling, as long as the distance from the
centerline of the obstruction to the sprinklers
(A) does not exceed one-half the maximum
spacing allowed between sprinklers.
for metric C < .8 m
A > (C - .2 m) + B
Sprinkler RES12
mm
0
25.4
76
127
178
229
279
356
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