DUCT
SCREWS MOUNTING PLATE
ROOF JACK INSTALLATION
Required ceiling and roof cut-out openings (see
CONNECTOR
FUEL
LINE
HOLES
14” SUPPLY
CONNECTION
Figure 13. Round Duct Connector Installed
MTG. PLATE TABS | SLIDE FURNACE | |
ALL THE WAY BACK | ||
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| ONTO MTG. PLATE |
SECURE FURNACE
WITH 2 FASTENERS AT FRONT
CORNER HOLES
Knockout Over Holes 
SUPPLY AIR DUCT
Figure 14. “A” & “B” Cabinet Furnaces
SLIDE FURNACE
BACK AGAINST
MTG. PLATE
MTG. PLATE TABS
SUPPLY
AIR DUCT
SECURE FURNACE 
WITH 2 FASTENERS
AT FRONT CORNER HOLES
FUEL LINE HOLES
Figure 15. “A” Cabinet Furnace on Coil
Cabinet
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| ROOF JACK |
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| SLANT DECK |
PITCHED | FLASHING | |
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ROOF |
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| "X" (SEE TABLE 5) |
CEILING |
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CAVITY | “A” | Roof |
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| Opening |
CEILING | “B” |
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| Flue Pipe | |
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| Combustion Air Pipe | |||||
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Furnace 56" or 76"
Figure 16. Ceiling Cavity Depth
Figure 11) must be carefully located to avoid misalignment of the furnace and Roof Jack. Note: Install only Roof Jack Assemblies listed in Table 4 on this heating appliance.
Roof Jack Selection
1.Determine depth of ceiling cavity from center of roof opening to center of ceiling opening. (See Dimension “A” in Figure 16.)
2.Determine ceiling height and subtract height of furnace. (See Dimension “B” in Figure 16.)
3.Add dimensions A + B (and X from Table 5 and Figure 18 if slant deck fl ashing is used). The total length of (A + B + X) must be within the minimum and maximum range of one of the Roof Jacks listed in Table 4.
Application Notes:
•FAW, FAWT, SAW and SAWT Series Roof Jacks with a 5” diameter inner vent pipe may be used with all models of M1 Series gas and M5 Series oil furnaces.
F = Flat Flashing: fl exes from 0/12 to 1/12 roof slope. See Figure 17 (page 12).
S = Slant Flashing: 2.5/12 Slope fl exes from 1/12 to 4/12 roof slope, 4/12 fl exes from 3/12 to 5/12. See Figure 18.
•Stainless steel roof jacks are available.
•M1/M5 furnaces may be used with roof jacks as tall as 170” (except M1M 056 & M1B 066 models, which are limited to 120”). An internal roof jack extension (p/n 901935 - 10”, p/n 903107 - 18”) can be used to increase roof jack height. All connections inside the home must be made below the ceiling.
NOTE: If the roof jack crown is covered or blocked with snow, the furnace will not operate properly.
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| MODEL NUMBER |
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| APPROX. LENGTH |
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| BELOW FLASHING |
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| 15” - 23” |
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| 21” - 35” |
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| 27” - 47” |
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| 35” - 63” |
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| 51” - 95” |
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| S AW | T 27 47 - 2 |
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| F = FLAT FLASHING |
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| FLUE STEEL TYPE | |
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| A= ALUMINIZED | |||||
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| S = SLANT FLASHING |
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| MIN. | ADJ. |
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| AW= ALL WEATHER |
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| LENGTH |
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| PITCH/12" RISE | ||
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| 0=FLAT | ||
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| 2=2.5/12 |
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| 4=4/12 |
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| BLANK = |
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| MAX. ADJ. | ||||||||||||||
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| T= TRANSIT MODE |
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| Table 4. Roof Jack Assemblies | ||||||||||||||||||||||||
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