a. Regardless of the location, the return air opening into the closet shall not be less than specified in the appliance’s listing.
b. Means shall be provided to prevent inadvert- |
ent closure by a flat object placed over the |
return air opening when it is located in the floor |
of the closet (versus the vertical front or side |
wall). |
c. The |
system leading into the closet, when located |
f. Noncombustible pans having 1" upturned flanges are located beneath openings in a floor duct system.
g. Wiring materials located in the return duct system shall conform to Articles
ROOF JACK
in the floor or ceiling shall not be less than 235 |
square inches (or 390 square inches for 5 ton |
ready M1 Furnaces). |
d. The total free area of openings in the floor or |
ceiling registers serving the return air duct |
PITCHED ROOF
SLANT DECK
FLASHING
"X" (SEE TABLE 1)
system must be at least 235 sq. in. At least |
one register should be located where it is not |
likely to be covered by carpeting, boxes and |
other objects. |
e. Materials located in the return duct system |
must have a flame spread classification of |
200 or less. This includes a closet door if the |
furnace is in a closet. |
| Approx. Length |
Model Number | Below Flashing |
15" - 23" | |
21" - 35" | |
27" - 47" |
CEILING |
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CAVITY |
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"A" | ROOF | |
| OPENING | |
CEILING | Flue Pipe | |
Combustion | ||
"B" | ||
| Air Pipe |
Furnace
56" or 76"
Figure 6. Roof Jack Assemblies
35" - 63" | |
51" - 95" |
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| S | AW | T | 27 47 - 2 |
| S |
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| A= ALUMINIZED |
F= FLAT FLASHING |
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All Weather Roof Jack Assemblies
MODEL | APPROX. ADJ. |
NUMBER | LENGTHS* |
PITCHED
ROOF
CEILING CAVITY
CEILING
ROOF JACK
SLANT DECK
FLASHING
"X" (SEE TABLE 6)
ROOF OPENING
CEILING OPENING
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| FO1323 |
| 13" - 23" |
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| FO2343 |
| 23" - 43" |
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| SO1835 |
| 18" - 35" |
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| 24" - 47" |
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| 32" |
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| SO4895 |
| 48" - 95" |
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| SOT2442 |
| 24" - 42" |
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| SOT2745 |
| 27" - 45" |
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| 45" - 81" |
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| FOT2846 |
| 28" - 46" |
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S= |
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F= FLAT FLASHING | MODE |
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Table 5. Roof Jack Assemblies
Figure 7. Example of Flat Jack
with Flashing
ROOF JACK WITH 2 1 2 /12 SLANT FLASHING
2 1 2 /12
SLANT DECK
5/12 ROOF SLOPE
Figure 8. Example of 2½/12 Slant Jack
with Flashing
7