Lennox MP03-VDLPM Installation Instructions Manual page 19

TABLE C
H Maximum V Minimum
(meters) (meters)
feet feet
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 + H = 40 feet (12.2 m) Max.
H = 20 ft. (6.096 m) Max.
**Wall
Firestop/Spacer
Square termination (SV4.5HT-2) shown.
See Table 3 as an aid in venting component selection
for a particular range of exterior wall thicknesses.
Figure 30
- Top Vent - ONE 90 DEGREE ELBOW - ELBOW
CONNECTION NOT DIRECTLY AT APPLIANCE
Example: If 20 feet of (H)
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) horizontal run,
up to a maximum horizontal
run of 20 feet.
H
V
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
H
*Wall
Firestop/Spacer
H = 28 inches (711 mm) Maximum
Square termination (SV4.5HT-2) shown.
Figure 31
- Top Vent - ONE 90 DEGREE ELBOW -
CONNECTION DIRECTLY AT APPLIANCE
Support
Bracket
19