Buderus Logamax plus GB142-24 Installation Instructions Manual page 15

The termination shall terminate at least 4 ft (1,220 mm) below, 4 ft
(1,220 mm) horizontally from, or 1 ft (305 mm) above any door,
window, or gravity air inlet into any building.
Vent must be at least 12 inches (305 mm) above grade, anticipated
snow line or roof surface (Canada 18'' (457 mm) minimum) ( fig. 20).
2
4
1
2
Fig. 20 Vent and air pipe position (1) of a sealed combustion system
[1] Intake
[2] 12" (300 mm) minimum
[3] 24" (610 mm) minimum
[4] Exhaust
1'
4'
7' (1220 mm)
Fig. 21 Vent position of a system with combustion air supply from the room (non-room sealed)
[1] At least 1 ft (305 mm) above grade and snow line
[2] Exhaust terminal must be at least 3 ft (915 mm) above forced air
inlet within 10 ft (3050 mm)
[3] Forced air inlet
[4] Gravity air Inlet
Logamax plus GB142-24/30/45/60 – 6720820104 (2017/05)
2
2
2
3
72150200-17.1TD
5'
(1525 mm)
1'
4'
(1220 mm)
4'
(1220 mm)
1
Vent termination must be at least 7 ft (2,135 mm) above a public
walkway ( fig. 21).
Vent must be 3 ft (915 mm) above any forced air intake within 10 ft
(3,050 mm) ( fig. 21).
Do not extend exposed vent pipe outside the building beyond
recommended distance. Condensate could freeze and block vent pipe.
Vent should terminate at least 3 ft (915 mm) away from adjacent outside
walls, inside corners and 5 ft (1525 mm) below roof overhang
( fig. 21).
It is not recommended to terminate vent above any door or window,
condensate can freeze causing ice formations.
Do not use chimney as a raceway if another boiler or fireplace is vented
into or through chimney.
3'
3'
(1220 mm)
3
2
Installation
3'
4
6
1'
72150200-18.1TD
15