Lennox Hearth LMDVT-3328-CNM Vertical Vent Figures/Tables Continued, Rear Vent - three elbows

VERTICAL VENT FIGURES/TABLES (CONTINUED)

Table C

H+H1 Maximum		H Maximum		V Minimum
feet	(meter)	feet	(meter)	feet	(meter)
5	(1.524)	2	(0.610)	1	(0.305)
10	(3.048)	4	(1.219)	2	(0.610)
15	(4.572)	6	(1.829)	3	(0.914)
20	(6.096)	8	(2.438)	4	(1.219)

V + V1 + H + H1 = 40 feet (12.2 m) Max

H = 8 feet (2.438 meters) Max.

H + H1 = 20 feet (6.096 meters) Max.

uWhen using Secure Flex, use Firestop / Spacer SF4.5VF vWhen using Secure Flex, use Firestop / Spacer SF4.5HF

Example: If 20 feet total (H+H1) horizontal vent run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1(V) to 5(H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H+H1) horizontal run up to a maximum total horizontal run of 20 feet.

Figure 31 - Rear Vent - three elbows

H1

uCeiling

Firestop / Spacer (SV4.5VF)

vWall Firestop/

Spacer (SV4.5HF)

V1	uCeiling
	Firestop / Spacer
	(SV4.5VF)

V

H

Table D

H + H1 Maximum				V Minimum
feet		(meter)	feet		(meter)
5		(1.524)		Elbow Only
5		(1.524)	1		(0.305)
10		(3.048)	2		(0.610)
15		(4.572)	3		(0.914)
20		(6.096)	4		(1.219)
		H + H1 = 20 feet (6.096 m) Max.
	V + V1 + H + H1 = 40 ft. (12.192 m) Max.

uWhen using Secure Flex, use Firestop / Spacer SF4.5VF vWhen using Secure Flex, use Firestop / Spacer SF4.5HF

Example: If 20 feet total (H+H1) horizontal vent run is needed,

then 4 feet minimum of (V) verti-		uCeiling
cal vent will be required.
		Firestop / Spacer
This table shows a 1(V) to 5(H)	V1	(SV4.5VF)
ratio. For every 1 foot of (V)
vertical, you are allowed 5 feet
of (H+H1) horizontal run up to
a maximum total horizontal run		H
of 20 feet.
An elbow is acceptable as 1 foot
of vertical rise except where
an elbow is the only vertical		H1
component in the system. See

Figure 37.

vWall Firestop/

Spacer (SV4.5HF)

V

Figure 32 - Top Vent - three elbows

16

Horizontal (Outside Wall)

Termination System

Figure 33 on Page 17, and Figures 34 to 42 on Pages 18 to 21 and their associated Horizontal Vent Table illustrate the various horizontal venting configurations that are possible for use with these appliances. Secure Vent pipe applications are shown in these Figures; Secure Flex pipe may also be used. A Horizontal Vent Table summarizes each system’s minimum and maximum vertical and horizontal length values that can be used to design and install the vent components in a variety of applications.

Both of these horizontal vent systems terminate through an outside wall. Building Codes limit or prohibit terminating in specific areas. Refer to Figure 7 on Page 6 for location guidelines.

Secure Vent SV4.5 direct vent system compo- nents are unitized concentric pipe components featuring positive twist lock connection, (refer to Figure 22 on Page 13). All of the appli- ances covered in this document are fitted with collars having locking inclined channels. The dimpled end of the vent components fit over the appliance collar to create the positive twist lock connection.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

A. Plan the vent run -

Analyze the vent routing and determine the types and quantities of sections required 4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876 mm) and 46-1/2" (1181

mm)net section lengths are available. Plan the vent lengths so that a joint does not occur at the intersection of ceiling or roof joists. Make allow- ances for elbows as indicated in Figure 24.

Maintain a minimum 1" (25 mm) clearance to combustibles on the vertical sections. Clear- ances for the horizontal runs are; 3" (76 mm) on top, 1" (25 mm) on sides, and 1" (25 mm) at the bottom.