2
Figure 1 Model A-1
Adjustable Dry Pendent
Flush, Recessed
Figure 2 Model A-1
Adjustable Dry Pendent
Extended
Figure 3 Model A-1
Adjustable Dry Pendent
Concealed
Center Line of
Sprinkler Branch Line
Finished Ceiling
LIne
1" (25 mm)
NPT
“C”
Dimension
(order length)
Center Line of
Sprinkler Branch
Line
1 1/2" (38.1 mm)
Min.
2" (50.8 mm)
Max.
2 9/16"
(65.1 mm)
Ceiling
Escutcheon
Plate
Main Tube
1" (25.4 mm), 1 1/4" (31.8 mm),
1 1/2" (38.1 mm)
Threaded Line Fitting = 3" (76.2 mm)
2" (50.8 mm) Threaded Line Fitting =
3 1/8" (79.4 mm)
Order “C”
Dim.
K-Factor
*5" (127.0 mm)
5.35
6
1
⁄
4
" (158.8 mm)
5.32
7
1
⁄
2
" (190.5 mm)
5.29
8
3
⁄
4
" (222.3 mm)
5.26
10" (254.0 mm)
5.23
11
1
⁄
4
" (285.8 mm)
5.20
12
1
⁄
2
" (317.5 mm)
5.17
13
3
⁄
4
" (349.3 mm)
5.14
15" (381.0 mm)
5.11
16
1
⁄
4
" (412.8 mm)
5.08
17
1
⁄
2
" (444.5 mm)
5.05
18
3
⁄
4
" (476.3 mm)
5.02
20" (508.0 mm)
4.99
* Available in flush only.
Recessed
K-Factor Table
Order “C”
Dim.
K-Factor
21
1
⁄
4
" (539.8 mm)
4.96
22
1
⁄
2
" (571.5 mm)
4.93
23
3
⁄
4
" (603.3 mm)
4.90
25" (635.0 mm)
4.87
26
1
⁄
4
" (666.8 mm)
4.84
27
1
⁄
2
" (698.5 mm)
4.81
28
3
⁄
4
" (730.3 mm)
4.78
30" (762.0 mm)
4.75
31
1
⁄
4
" (793.8 mm)
4.72
32
1
⁄
2
" (825.5 mm)
4.69
33
3
⁄
4
" (857.3 mm)
4.66
35" (889.0 mm)
4.63
Order “C”
Dim.
K-Factor
20" (508.0 mm)
4.88
21
1
⁄
4
" (539.8 mm)
4.85
22
1
⁄
2
" (571.5 mm)
4.82
23
3
⁄
4
" (603.3 mm)
4.79
25" (635.0 mm)
4.76
26
1
⁄
4
" (666.8 mm)
4.73
27
1
⁄
2
" (698.5 mm)
4.70
28
3
⁄
4
" (730.3 mm)
4.67
30" (762.0 mm)
4.64
31
1
⁄
4
" (793.8 mm)
4.61
32
1
⁄
2
" (825.5 mm)
4.58
33
3
⁄
4
" (857.3 mm)
4.55
35" (889.0 mm)
4.52
Extended
K-Factor Table
Order “C”
Dim.
K-Factor
3
3
⁄
4
" (95.3 mm)
5.27
5" (127.0 mm)
5.24
6
1
⁄
4
" (158.8 mm)
5.21
7
1
⁄
2
" (190.5 mm)
5.18
8
3
⁄
4
" (222.3 mm)
5.15
10" (254.0 mm)
5.12
11
1
⁄
4
" (285.8 mm)
5.09
12
1
⁄
2
" (317.5 mm)
5.06
13
3
⁄
4
" (349.3 mm)
5.03
15" (381.0 mm)
5.00
16
1
⁄
4
" (412.8 mm)
4.97
17
1
⁄
2
" (444.5 mm)
7.94
18
3
⁄
4
" (476.3 mm)
4.91
Caution: This unit must only be installed with
the special cast iron fitting supplied, as this is a
listed assembly. Installation into any other
fitting will void the listing.
Notes:
A-1 Adjustable Dry Pendent Ordering Length
1. Order by “C” Dimensions shown in the tables above. Round
actual “C” dimension up or down to the closest “C” dimension
shown in the chart. Field adjustment is
±
1 1/2" (38.1 mm) from
the “C” dimension shown in the chart. The “C” dimension is
measured from the center line of the branch line to the face of
the finished ceiling.
2. Maximum Listed length is 36" (914.4 mm).
A-1 Adjustable Dry Pendent Design Guidelines
After determining the order length, use the K-factor associated with
the length in the hydraulic calculations at the tee in the branchline.
Concealed
K-Factor Table
Order “C”
Dim.
K-Factor
22
1
⁄
2
" (571.5 mm)
4.93
23
3
⁄
4
" (603.3 mm)
4.90
25" (635.0 mm)
4.87
26
1
⁄
4
" (666.8 mm)
4.84
27
1
⁄
2
" (698.5 mm)
4.81
28
3
⁄
4
" (730.3 mm)
4.78
30" (762.0 mm)
4.75
31
1
⁄
4
" (793.8 mm)
4.72
32
1
⁄
2
" (825.5 mm)
4.69
33
3
⁄
4
" (857.3 mm)
4.66
35" (889.0 mm)
4.63
Order “C”
Dim.
K-Factor
7
1
⁄
2
" (190.5 mm)
5.29
8
3
⁄
4
" (222.3 mm)
5.26
10" (254.0 mm)
5.23
11
1
⁄
4
" (285.8 mm)
5.20
12
1
⁄
2
" (317.5 mm)
5.17
13
3
⁄
4
" (349.3 mm)
5.14
15" (381.0 mm)
5.11
16
1
⁄
4
" (412.8 mm)
5.08
17
1
⁄
2
" (444.5 mm)
5.05
18
3
⁄
4
" (476.3 mm)
5.02
20" (508.0 mm)
4.99
21
1
⁄
4
" (539.8 mm)
4.96
Center Line of
Sprinkler Branch Line
Finished Ceiling
LIne
“C”
Dimension
(order length)
Center Line of
Sprinkler Branch
Line
3 3/4" (95.3 mm) Min.
4 5/8 (117.5 mm) Max.
Main Tube
1" (25.4 mm), 1 1/4" (31.8 mm),
1 1/2" (38.1 mm)
Threaded Line Fitting = 3" (76.2 mm)
2" (50.8 mm) Threaded Line Fitting =
3 1/8" (79.4 mm)
1" (25 mm)
NPT
2 9/16"
(65.1 mm)
Center Line of
Sprinkler Branch Line
Finished
Ceiling LIne
Main Tube
Center Line of
Sprinkler Branch
Line
Ceiling Cover Plate
3 5/8" (92.1 mm) Diameter
“C”
Dimension
(order length)
3/16"
(4.8 mm)
1" (25.4 mm), 1 1/4" (31.8 mm),
1 1/2" (38.1 mm)
Threaded Line Fitting = 3" (76.2 mm)
2" (50.8 mm) Threaded Line Fitting =
3 1/8" (79.4 mm)
2 9/16"
(65.1 mm)
1" (25 mm)
NPT
OBSOLETE
