Lennox Hearth 2-EN53-VDLPM, MN04-VDLPM Install the Vent System, Vertical Termination Systems Roof

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Step 3. INSTALL THE VENT SYSTEM

General Information

These instructions should be used as a guide- line and do not supersede local codes in any way. Install vent according to local codes, these instructions, the current National Fuel Gas Code (ANSI-Z223.1) in the USA or the current standards of CAN/CGA-B149.1 and - B149.2 in Canada.

These fireplaces are designed, tested and listed for operation and installation with, and only with, Secure Vent™ Direct Vent System Components, Secure Flex™

Flexible Vent Components manufactured by Security Chimneys International and Z-FLEX™Model GA Venting Systems listed to UL1777 and ULCS635 manufac- tured by Flexmaster Canada Limited. These approved vent system components are labeled for identification. DO NOT use any other manufacturer's vent com- ponents with these appliances.

These fireplaces must be vented directly to the outside.

Determine the venting for the appliance. If the vent run will include at least 8 feet of vertical rise, then install the second restrictor in the appliance collar before connecting any vent (Refer to Figure 12 ). Place the second restric- tor inside the fixed restrictor.

Note: The second restrictor is included within the firebox.

Exhaust Vent Fixed Restrictor

Second Restrictor (For Vertical Vent Only)

Figure 12

The vent system may not service multiple appliances, and must never be connected to a flue serving a solid fuel burning appliance. The vent pipe is tested to be run inside an enclos- ing wall (such as a chase). There is no require- ment for inspection openings in the enclosing wall at any of the joints in the vent pipe.

Select Venting System - Horizontal or Vertical

With the appliance secured in framing, deter- mine vent routing and identify the exterior termination location. The following sections describe vertical (roof) and horizontal (exterior wall) vent applications. Refer to the section relating to your installation. A list of approved venting components is shown in the tables on page 26.

VERTICAL TERMINATION SYSTEMS (ROOF)

Figures 13, 17 and 23 through 25 on pages 12, 14 and 15 and their associated Vertical Vent Tables illustrate the various vertical vent- ing configurations that are possible for use with these appliances. Secure Vent pipe ap- plications are shown in these figures; Secure Flex pipe may also be used.

A Vertical 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 these vertical vent systems terminate through the roof. The minimum vent height above the roof and/or adjacent walls is speci- fied in ANSI Z223.1-(latest edition) (In Canada, the current CAN-1 B149 installation code) by major building codes. Always consult your local codes for specific requirements. A gen- eral guide to follow is the Gas Vent Rule (refer to Figure 4 on page 6 ).

Vertical (Straight) Installation

Determine the number of straight vent sec- tions required. 4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876 mm) and 461/2" (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. Refer to the Vent Section Length Chart.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

SV4.5CGV-1	SV4.5FA OR
Termination
	SV4.5FB Flashing
	AND SV4.5SC
	STORM COLLAR

1" (25.4 mm) Minimum Clearance to Combustibles

*SV4.5VF Firestop/Spacer

40' Max.		SV4.5L6/12/24/36/48
(12.2 M)
6' Min.		Vent Sections
(1.8 M)
	*When using Secure Flex,
		use Firestop/Spacer
			SF4.5VF

Figure 13

Vertical (Offset) Installation

Analyze the vent routing and determine the quantities of vent sections and number of elbows required. Refer to Vertical Vent Fig- ures and Tables on page 14 and 15 to select the type of vertical installation desired. Vent sections are available in net lengths of 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). Refer to the Vent Section Length Chart on page 11 for an aid in selecting length combinations. Elbows are available in 90° and 45° configurations. Refer to Figure 18 for the SV4.5E45 and SV4.5E90 elbow dimensional specifications.