Vermont Casting SC36, SR42 Planning Information, Mounting The Fireplace, Planning The Chimney Run

Majestic Fireplaces® SR/SC Series

Planning Information

Preplanning an installation is very important to ensure safety and to save time and money. An installer must predetermine where a fireplace will be set and how the chimney system will be run.

Mounting The Fireplace

A fireplace may only be mounted on the following surfaces:

1.A flat combustible surface.

2.A raised wooden platform.

3.A concrete block or other solid object placed be- neath each of the four (4) corners of the fireplace.

The fireplace must be spaced 1/2 inch from a com- bustible back wall and 1/2 inch from a combustible side wall or support. (Fig. 20, Page 14)

Planning The Chimney Run

	LT		TOTAL	INSTALLED
		MODEL SK	LENGTH	LENGTH
		2 WALL CHIMNEY	(LT)	(L1)
	L1	SK81	11¹⁄₂"	10¹⁄₂"
		SK818	17¹⁄₂"	16¹⁄₂"
	L1	SK83	35¹⁄₂"	34¹⁄₂"
		SK84	47¹⁄₂"	46¹⁄₂"
				WF288
Fig. 7	Installed lengths of chimney sections.

Determine how the chimney will be run, length of run and chimney components required to complete the job. (Fig. 6) Never install a chimney below minimum heights.

In planning a chimney system, it is important to know:

1.The height of a chimney is measured from the hearth to the exit point on the termination.

2.A chimney cannot be offset more than 30 degrees from a vertical plane.

3.A chimney may run straight up or it may be neces- sary to offset it to avoid obstructions.

4.The maximum length of an angled run (total chim- ney system) is 20 feet.

5.No more than 2 offsets (4 total 30˚ elbows in U.S./or 2 total 45˚ elbows in Canada) per fireplace may be used.

6.A guy wire stabilizer is required for chimneys extending more than 6 feet above a roof line.

The Ten Foot Rule

Major U.S. building codes specify a minimum chimney height above the roof top. The “Ten Foot Rule” is a fire safety rule and not a draft rule. To ensure proper draft, it is recommended that you always meet or exceed the “Ten Foot Rule,” especially when installing a termina- tion on a high pitch roof. (Fig. 8)

The key points of the "Ten Foot Rule" are:

1.If the horizontal distance from the center of the chimney to the peak of the roof is 10 feet or less, the top of the chimney must be at least 2 feet above the peak of the roof, but never less than 3 feet in height above the highest point where it passes through the roof.

2.If a horizontal distance from the center of the chimney to the peak of the roof is more than 10 feet, a chimney height reference point is established that is on the surface of the roof a distance of 10 feet from the center of the chimney in a horizontal plane. The top of the chimney must be at least 2 feet above the reference point, but never less than 3 feet in height above the highest point where it passes through the roof.

	0 TO 10'
	2' MIN.	0 TO 10'
	3'
	MIN.
		2' MIN.3'
		MIN.
	REFERENCE
	POINT
		AC246
Fig. 8	Ten Foot Rule illustration.

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