Vermont Casting H33BDVRRNP manual Vertical Sidewall Installations, Maximum elbow usage

Pyromaster© H33BDVRRN/P

Example: According to the chart the maximum horizontal vent length in a system with a 7.5' vertical rise is 20' (6 m) and if a 90° elbow is required in the horizontal vent it must be reduced to 17' (5.2 m). In Figure 20 Dimension A plus B must not be greater than 17' (5.2 m).

			7 ft.
	A		(2134 mm)
			B
		10 ft.
		(3048 mm)	90ß elbow = 3 ft.
		A + B = 17 ft. (Max.)
7 ft. 6 in.
(2286 mm)
			CFM147
Fig. 19	Dimension A plus B must not be greater than 17’
(5.2m).

•The maximum number of 45° elbows permitted per side wall installation is two (2). These elbows can be installed in either the vertical or horizontal run.

•For each 45° elbow installed in the horizontal run, the length of the horizontal run MUST be reduced by 18" (45cm). This does not apply if the 45° elbows are installed on the vertical part of the vent system.

•The maximum number of elbow degrees in a system is 270°. (Fig. 20)

Example:
Elbow 1	= 90°
Elbow 2	= 45°
Elbow 3	= 45°	4
Elbow 4	= 90°
Total angular variation	= 270°
1 + 2 + 3 + 4 = 270°
		3
	2
1

CFM132

Fig. 20 Maximum elbow usage.

•IMPORTANT • Minimum clearance be- tween vent pipes and combustible materials

is one (1”) inch (25 mm) on bottom, sides and top.

Twist Lock Vent Starter Kit 7DVSK, plus Transition Elbow 7DVRT90 must be used in Vertical Sidewall installations. The 4” pipe must be centred inside the 7” pipe coming off the 7DVRT90 transition elbow.

Canadian & USA Installations:

The venting system must conform with local codes, or in the absence of local codes, with National Fuel Gas Code, ANSI Z223.1 - latest edition, or CSA-B149.1 Installation Code.

Only CFM Corporation venting compo- nents specifically approved and labelled for this fireplace may be used.

Vertical Sidewall Installations

STEP 1

Locate vent opening on the wall. It may be necessary to first position the fireplace and measure to obtain hole location. Depending on whether the wall is com- bustible or noncombustible, cut opening to size. (Fig. 21)

(For combustible walls first frame in opening.)

	Vent Opening for Combustible Wall
	9³⁄₈”
	(240mm)
9³⁄₈”
(240mm)
	Framing Detail
	Vent Opening for Noncombustible Wall
	7¹⁄₂”
	(190mm)
	VO584-100
Fig. 21	Locate vent opening on wall.

Combustible Walls (Fig. 21): Cut a 9³⁄₈”H x 9³⁄₈” W (240 mm x 240 mm) hole through the exterior wall and frame.

Noncombustible Walls (Fig. 21): Hole opening must be 7¹⁄₂” (190 mm) in diameter.

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