Minimum Clearances from the Flue Pipe to
Combustible Materials
| For Horizontal Sections | For Vertical | At Wall Firestops | ||||
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| Top | Bottom | Sides |
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| 3 inches | 1 inch | 1 inch | 1 inch | 1/2 inch | 1 inch | |
| (75mm) | (25mm) | (25mm) | (25mm) | (64mm) | (13mm) | (25mm) |
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For minimum clearances, see the direct vent termination clearance diagrams on page 7.
1.2 Framing the Heater
CAUTION: MEASURE HEATER DIMENSIONS AND VERIFY FRAMING METHODS AND WALL COVERING DETAILS, BEFORE FRAMING CON- STRUCTION BEGINS.
Framing can be built before or after the heater is set in place. Framing should be positioned to accommodate wall coverings and heater facing material. The diagram below shows framing reference dimensions.
!WARNING: FRAMING DIMENSIONS AS- SUME USE OF 1/2 INCH THICK WALL COVERING MATERIALS ON EXTERIOR OF
FRAMING ONLY AND NO SHEETROCK ON IN- TERIOR OF FRAMING.
Shows center of 12" x 12” (305mm x 305mm) flue framing holes. The center of the hole is 25mm above the center of the horizontal flue pipe. Framing should be constructed of 2" x 4" (51mm x 102mm) lumber or heavier.
B
A
C
B
D
A
C
Model: | A | B |
| C | D | |
450 | Elbow (Horizontal) Flue | 41" | 43 1/4" | 21 | 9/16" | 37 1/8" |
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| (1041mm) | (1099mm) | (548mm) | (943mm) | |
450 | Elbow (Vertical) Flue | 42 3/4" | 40 3/4" | 21 | 9/16" | - |
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| (1086mm) | (1035mm) | (548mm) | ||
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Figure 3. Framing Dimensions
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