Notes:

•It is very important that the horizontal/in- clined run be maintained in a straight (no dips) and recommended to be in a slightly elevated plane, in a direction away from the fireplace of 1/4" rise per foot (20 mm per meter) which is ideal, though rise per foot run ratios that are smaller are acceptable all the way down to at or near level.

•SV4.5VF (Secure Vent), SF4.5VF (Secure Flex) firestop/spacer must be used anytime vent pipe passes through a combustible floor or ceiling. SV4.5HF (Secure Vent), SF4.5HF (Secure Flex)firestop/spacer must be used anytime vent pipe passes through a combustible wall.

•Two 45 degree elbows may be used in place of one 90 degree elbow. The same rise to run ratios, as shown in the venting Figures for 90 elbows, must be followed if 45 degree elbows are used.

•AN ELBOW IS ACCEPTABLE AS 1 FOOT OF VERTICAL RISE EXCEPT WHERE AN ELBOW IS THE ONLY VERTICAL COMPONENT IN THE SYSTEM (See Figure 37).

uCeiling Firestop /

40 feet

(12.2 meters)

Spacer (SV4.5VF)

Maximum

 

uWhen using Secure Flex, use Firestop / Spacer

SF4.5VF

A Vent Restrictor, as shown in Figure 18 Page 11, must be used in this application

Figure 28 - Top Vent - STRAIGHT

Table A

H Maximum

V Minimum

feet

(meter)

feet

(meter)

 

 

 

 

2

(0.610)

1

(0.305)

 

 

 

 

4

(1.219)

2

(0.610)

6

(1.829)

3

(0.914)

 

 

 

 

8

(2.438)

4

(1.219)

 

 

 

 

V + H = 40 feet (12.2 meters) Max.

H = 8 feet (2.4 meters) Max.

Ratio V to H ratio is 1:2

Example: If 8 feet of (H) horizontal vent run is needed, then 4 feet minimum (V) vertical vent will be required.

This table shows a 1(V) to 2(H) ratio. For every 1 foot of (V) vertical, you are allowed 2 feet of (H) horizontal run, up to a maximum horizontal run of 8 feet.

uWhen using Secure Flex, use Firestop /

Spacer SF4.5VF.

uCeiling Firestop /

Spacer (SV4.5VF)

V

H

Figure 29 - Rear Vent - ONE 90 DEGREE ELBOW

H

uCeiling Firestop /

Spacer (SV4.5VF)

V1

Table B

H 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)

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

H = 20 feet (6.096 meters) Max.

V

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

vWall Firestop/

This table shows a 1(V) to 5(H) ratio. For

every 1 foot of (V) vertical, you are allowed 5

Spacer (SV4.5HF)

feet of (H) horizontal run, up to a maximum

 

 

horizontal run of 20 feet.

uWhen using Secure Flex, use Firestop /

An elbow is acceptable as 1 foot of vertical

Spacer SF4.5VF.

rise except where an elbow is the only vertical

vWhen using Secure Flex, use Firestop /

component in the system. See Figure 37.

Spacer SF4.5HF.

 

Figure 30 - Top Vent - TWO 90 DEGREE ELBOWS

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

15

Page 14 Page 16
Page 15
Image 15
Lennox Hearth LMDVT-3328-CPM 610 305 219 829 914 438, Table B Maximum Minimum Feet Meter, Ratio V to H ratio is
Page 14 Page 16

LMDV-3530-CNM, LMDV-35 Series, LMDVR-3328-CNE, LMDV-4035-CNE, LMDV-4035-CPM specifications

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Overall, Lennox Hearth’s suite of models combines elegance, efficiency, and innovation, ensuring that homeowners can find the perfect heating solution to complement their living spaces. Each product is engineered with state-of-the-art technologies that reflect Lennox’s dedication to quality and customer satisfaction.
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