2
Figure 2
Model GB and GB-QR Dry Pendent
Flush, Recessed
Figure 1
Model GB and GB-QR Dry Pendent
Extended
Dry Pendent Design Guidelines
To determine the K-factor, follow these steps:
1. Determine the K-factor length (NOT The “A” DIMENSION). The K-factor
is determined as follows:
Flush - “A” dim
7
⁄
8
" (22.2 mm) = length for K-factor.
Recessed - “A” dim
3
⁄
8
" (9.5 mm) = length for K-factor.
Extended - “A” dim3
1
⁄
2
" (88.9 mm) = length for K-factor.
2. Determine the K-factor for that length by using the K-factor table.
3. Use the K-Factor at the tee in the branchline for the calculations.
Finished Ceiling
LIne
1" (25 mm)
Thread
“A”
Dimension
(order length)
Main Tube
2 1/2" (63.5 mm)
±
1/8" (3.8 mm)
Ceiling Opening
1 15/16" (49.2 mm)
Inner Cup Dia.
If A is > 3 1/4" (82.6 mm)
Dimension is 4 5/8" (117.5 mm)
(
±
1 1/2" (38.1 mm))
If A is
≤
3 1/4" (82.6 mm)
Dimension is 3 5/8" (92.1 mm)
(
±
3/4" (19.1 mm))
Caution: See step one of installation sequence for appropriate fitting requirements.
Ordering Length for Dry Pendent Heads
Flush
— The “A” dimension is measured from the face of the tee to the finished ceiling. This is only approximately flush. Order
to the nearest
1
⁄
4
" (6.4 mm). Minimum “A” dimension is 2" (50.8 mm).
Recessed
— The “A” dimension is measured from the face of the tee to the finished ceiling. Minimum “A” dimension is 2
1
⁄
8
"
(54.6 mm). Adjustment is
±
3
⁄
16
" (4.8 mm).
Extended
— The “A” dimension is measured from the face of the tee to the finished ceiling. Follow one of these two options:
If the “A” dimension is less than or equal to 3
1
⁄
4
" (82.6 mm), total adjustment is 1
1
⁄
2
" (38.1 mm) (from the mid point of the
adjustment range
±
3
⁄
4
" (19.1 mm)). Order to the nearest
1
⁄
4
" (6.4 mm). Minimum “A” dimension is 0".
If the “A” dimension is greater than 3
1
⁄
4
" (82.6 mm), the total adjustment is 3" (76.2 mm) (from the mid point of the adjustment
range
±
1
1
⁄
2
" (38.1 mm)). Order to the nearest
1
⁄
4
" (6.4 mm). Minimum “A” dimension is 3
1
⁄
4
" (82.6 mm).
Length
K-Factor
(metric)
2
1
⁄
2
"
(63.5 mm) to less than 10
1
⁄
8
"
(76.4 mm)
5.3
(76.4)
10
1
⁄
8
"
(254.1 mm) to less than 17
5
⁄
8
"
(75.0 mm)
5.2
(75.0)
17
5
⁄
8
"
(447.7 mm) to less than 25
1
⁄
4
"
(73.5 mm)
5.1
(73.5)
25
1
⁄
4
"
(641.4 mm) to less than 32
3
⁄
4
"
(72.1 mm)
5.0
(72.1)
32
3
⁄
4
"
(831.9 mm) to less than 40
3
⁄
8
"
(70.7 mm)
4.9
(70.7)
40
3
⁄
8
"
(1025.5 mm) to less than 48" (1219.2 mm)
4.8
(69.2)
K-Factor Table
Finished Ceiling
LIne
1" (25 mm)
Thread
“A”
Dimension
(order length)
Main Tube
2 1/2" (63.5 mm)
±
1/8" (3.8 mm)
Ceiling Opening
1 15/16"
(49.2 mm)
Inner Cup Dia.
OBSOLETE
