Vermont Castings EWF36A
Ceiling Chimney Hole/
Possible Obstructions
The size of the hole in ceiling will vary with the angle at which the chimney passes through ceiling.
Drive a nail up through ceiling at marked chimney center point. Go to floor above and see where hole will be cut. Check to see where existing ceiling joists and other possible obstructions are located...i.e. wiring, plumbing etc... If necessary,
Cutting the Hole
Cover fireplace collar opening and cut proper sized chimney hole in chimney.
Framing the Ceiling Hole
Frame the ceiling chimney hole as shown in Figure
10.It is good practice to use framing lumber that is the same size as the ceiling joists; this is a requirement at attic level.
The following table gives firestop spacer model num- bers:
Chimney Hole Size
| Angle of Chimney at Ceiling | |
Size of Chimney | Vertical | 30° |
| FS2A | FS6A |
8” Flue | 17¹⁄₂” x 17¹⁄₂” | 17⁷⁄₈” x 29⁵⁄₈” |
| (445 x 445mm) | (454 x 753mm) |
Fig. 9 Ceiling chimney hole sizes necessary for installing firestop spacer.
The inside dimension of the frame must be the same as the hole size selected from Figure 9 in order to provide required the 2” (51mm) air space between the outside diameter of the chimney and the edges of the framed ceiling hole.
Positioning, Safety Strips,
Securing the Fireplace
Slide fireplace into position.
Safety strips are used to ensure that any combustible materials in front of the fireplace are protected even though a noncombustible hearth extension is required.
When the finished extended hearth is added, the top of the finished hearth must be flush with the bottom of the fireplace. “Z” shaped metal safety strips have been supplied with the fireplace and are required for instal- lation. The safety strips provided have a 1” offset. For applications with a greater offset, “Z” shaped strips will have to be fabricated of metal. Overlap safety strips at least 1/2” to provide a positive joint. The safety strips must also extend at least 1¹⁄₂” (38mm) beyond the sides of the fireplace. (Fig. 11)
Existing | 17¹⁄₂” | 17¹⁄₂” |
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Ceiling |
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Joists |
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| Chimney |
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| Hole |
New Framing |
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Members |
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| Ceiling | FP551b |
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Fig. 10 | Typical frame for ceiling chimney hole. |
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| “Z” Metal Safety | |
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| Strips (1 or 2 pcs.) | |
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| “Z” Safety |
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| Strip |
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| Fire- | Decorative |
1¹⁄₂” |
| place | Hearth | |
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| Face | ||
(38mm) | 1/2” Min. | Plat- |
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| Overlap |
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| Hearth Ext. | FP557b |
Fig. 11 | Safety strip installation. |
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Note: Safety strips are not required over noncombus- tible floors where all supports at the base of the fire- place are noncombustible.
Two (2) nailing flanges are supplied with the fireplace. To level the box and secure it firmly in place, remove the nailing flanges from the hearth and install at the sides of the fireplace as shown in Figure 12.
10 | 20005167 |