Vermont Casting EWF30 Ceiling Chimney Hole Possible Obstructions, Cutting the Hole

Vermont Castings EWF30

Locate center point of the chimney on ceiling as though a straight up chimney arrangement is to be used. Mea- sure your offset dimension from straight up chimney center point on ceiling.

Existing	AB	AB
Ceiling
Joists

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,

New Framing Members

Chimney

Hole

Ceiling

plumbing etc... If necessary, re-position chimney and/or

A"SK" Series framing = 14���" X 14���" (368 x 368 mm)

fireplace to avoid obstructions.

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:

B "S" Series framing = 17���" X 17���" (445 x 445 mm)

Fig. 10 Typical frame for ceiling chimney hole.

FP551b

Chimney Hole Size

Size of Chimney	Angle of Chimney at Ceiling
	Vertical	30°
8" Flue	SKFS2A	SKFS6A
"SK" Series	14¹⁄₂" x 14¹⁄₂"	14¹⁄₂" x 25¹⁄₂"
	(368mm x 368mm)	(368mm x 648mm)
8" Flue	FS2A	FS6A
"S" Series 3-Wall	17¹⁄₂" x 17¹⁄₂"	17⁷⁄₈" x 29⁵⁄₈"
	(445mm x 445mm)	(454mm x 753mm)

1¹⁄₂” (38mm)

1/2” Min.

Overlap

“Z” Metal Safety Strips (1 or 2 pcs.)

“Z” Safety Strip

Fire- Decorative

place Hearth Face

Plat- form

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 pro- vide required the 1¹⁄₂” (38 mm) 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

Hearth Ext. FP1564

Fig. 11 Safety strip installation.

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)

NOTE: Safety strips are not required over noncombus- tible floors where all supports at the base of the fire- place are noncombustible.

Four (4) nailing flanges are supplied with the fireplace (found on the fireplace hearth). 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.

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