Ftf10 offset elevation chart, Installing offsets – Lennox Hearth ELITE SERIES LBC-3824 User Manual
Page 14
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
14
Figure 40
Figure 41
Underside Of Chimney
Chimney Section (S)
FTF10-E30 Return Elbow*
FTF10-30 Offset Elbow*
B
A
*Part of Offset/Return Package Model FTF10-ES30
INSTALLING OFFSETS
First, review the Offset Elevation Chart and
Figure 41 for reference.
Step 1. Determine the offset distance where
chimney is to pass through the first ceiling-
dimension “A.” To find this point on your ceil-
ing, first determine the center point for a verti-
cal chimney following the instructions for ver-
tical installation.
Measure height to the ceiling from the top of
fireplace-dimension “B.” Use the appropriate
Offset Elevation Chart to find dimension “A.”
Mark point where you will drive your nail to
show the center point for your offset ceiling cut.
Step 2. Proceed by using the Straight Up Instal-
lation Instructions for cutting and framing ceil-
ing and roof openings.
Note: See Framing and Dimension Chart for
the sizes of the ceiling and roof openings. The
size of the roof opening varies with the degree
of pitch of the roof.
A
B
FTF10-ES30
Number of FTF10
A
B
Offset
Height
Offset/Return
FTF10-S4
Chimney Sections
Offset
Height
(Inches)
(Inches)
Elbow Set
Stabilizer
12"
18"
36"
(mm)
(mm)
4
15
³⁄₄
1
0
0
0
0
102
400
9
24
¹⁄₂
1
0
1
0
0
229
622
12
29
³⁄₄
1
0
0
1
0
305
756
14
¹⁄₄
33
¹⁄₂
1
0
2
0
0
362
851
17
¹⁄₄
38
¹⁄₂
1
0
1
1
0
438
978
20
¹⁄₄
43
³⁄₄
1
0
0
2
0
514
1111
21
45
¹⁄₄
1
0
0
0
1
533
1149
22
¹⁄₄
47
¹⁄₂
1
0
2
1
0
565
1207
25
¹⁄₄
52
¹⁄₂
1
0
1
2
0
641
1334
26
¹⁄₄
54
¹⁄₄
1
0
1
0
1
667
1378
28
¹⁄₄
57
³⁄₄
1
0
0
3
0
718
1467
29
¹⁄₄
59
¹⁄₄
1
0
0
1
1
743
1505
31
¹⁄₄
63
1
0
2
0
1
794
1600
32
¹⁄₂
65
1
0
4
1
0
826
1651
34
¹⁄₄
68
¹⁄₄
1
0
1
1
1
870
1734
36
¹⁄₄
71
³⁄₄
1
0
3
0
1
921
1822
37
¹⁄₄
73
¹⁄₄
1
0
0
2
1
946
1861
38
¹⁄₄
75
1
0
0
0
2
972
1905
39
¹⁄₄
77
1
0
2
1
1
997
1956
41
¹⁄₂
80
¹⁄₂
1
0
1
4
0
1054
2045
43
¹⁄₄
83
³⁄₄
1
0
1
0
2
1099
2127
44
¹⁄₂
85
³⁄₄
1
0
3
1
1
1130
2178
45
¹⁄₄
87
¹⁄₂
1
0
0
3
1
1149
2223
46
¹⁄₄
89
1
0
0
1
2
1175
2261
48
¹⁄₄
91
¹⁄₂
1
0
2
0
2
1226
2324
49
¹⁄₂
94
¹⁄₂
1
0
1
5
0
1257
2400
51
¹⁄₄
97
³⁄₄
1
0
1
1
2
1302
2483
54
¹⁄₄
103
1
0
0
2
2
1378
2616
55
¹⁄₄
104
¹⁄₂
1
0
0
0
3
1403
2654
56
¹⁄₂
106
¹⁄₂
1
0
2
1
2
1435
2705
59
¹⁄₂
111
³⁄₄
1
0
1
2
2
1511
2838
62
¹⁄₂
116
³⁄₄
1
1
1
0
3
1588
2965
65
³⁄₄
122
1
1
0
1
3
1664
3099
67
³⁄₄
125
¹⁄₂
1
1
2
0
3
1721
3188
69
³⁄₄
128
¹⁄₂
1
1
1
3
2
1772
3264
70
³⁄₄
130
³⁄₄
1
1
1
1
3
1797
3321
73
³⁄₄
136
1
1
0
2
3
1873
3454
75
³⁄₄
139
¹⁄₂
1
1
2
1
3
1924
3543
79
³⁄₄
146
¹⁄₄
1
1
1
0
4
2026
3715
81
148
¹⁄₄
1
1
3
1
3
2057
3766
82
³⁄₄
151
¹⁄₂
1
1
0
1
4
2102
3848
87
³⁄₄
160
¹⁄₄
1
1
1
1
4
2229
4070
FTF10 OFFSET ELEVATION CHART