Lennox Hearth OASIS SERIES LSO-43 - Manual (Page 14)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 14
Figure 36
Figure 37
INSTALLING OFFSETS
First, review the Offset Elevation Chart and
Figure 37 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.
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
Underside Of Chimney
Chimney Section (S)
FTF10-E30 Return Elbow*
FTF10-30 Offset Elbow* B
A
*Part of Offset/Return Package Model FTF10-ES30