Dunkirk Helix VX Vertical Laser Tube Wall Hung Stainless Steel Modulating Condensing Boiler - Manual (Page 25)

25
Side Wall
Terminations
 3" (80mm) Minimum horizontal
separation between combustion air
intake and vent terminations.

8" (203mm) Minimum vertical
separation between combustion air
intake and vent terminations.
 12" (305mm) Minimum separation
between bottom of combustion air
intake and bottom of vent.
 Multiple terminations as shown in
6-1, and 6-3 must be a minimum of
12” (305mm) horizontally between
vent of one termination and air
intake of next appliance.
 Maximum allowable total outside
exposure vent length equals 10 ft.
(3.05m).
 Maintain a pitch of 1/2" per ft.
(13mm/m) outside exposure back to
boiler to ensure proper condensate
drainage for horizontal runs.
Roof
Terminations

3" (76mm) Minimum horizontal
separation between combustion air
intake and vent of same appliance.
 8" (203mm) Minimum vertical
separation between combustion
air intake and vent of different
appliances.

15" (381mm) Maximum horizontal
length of vent.

Minimum vent/intake between
different appliances 12" (305mm).
 Maximum allowable total vertical
vent length with outside exposure is
10 ft.(3.05m).
 Abandoned unused masonry
chimney may be used as chaseway
for combustion air and vent. Both
combustion air and vent pipe must
exit above top of chimney with
clearances as shown in figure 6-1.
12" (305mm)
Minimum
8" (203mm)
Minimum
15" (381mm)
Maximum
3" (76mm)
Minimum
Vent Combustion
Air
12" (305mm) US,
18" (457mm) Canada
Minimum Above
Anticipated Snow Line
Vent
3" (76mm)
Minimum
Separation
12" (305mm)
Minimum From
Overhang
12" (305mm) Minimum
Separation Between
Bottom Of Combustion Air
Intake And Bottom Of Vent
See Snow & Ice
Page 29
Combustion Air
Vent
12" (305mm)
Minimum
Separation
See Snow & Ice
Page 29
FIGURE 6-1 Two Pipe Roof Vent
FIGURE 6-2 Two Pipe Side Wall Vent
FIGURE 6-3 Two Pipe Side Wall Vent (Multiple Appliances.
Combustion Air
Roof Line
6 - COMBUSTION AIR AND VENT PIPING