Burnham ALP150 - Manual (Page 20)

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Figure 12: Field installation of Boiler Concentric Vent Collar
codes. Contact local building or fire officials about
restrictions and installation inspection in your area.
2. Horizontal vent pipe must maintain a minimum ¼
inch per foot slope towards the boiler.
3. Use noncombustible ¾ inch pipe strap to support
horizontal runs and maintain vent location and
slope while preventing sags in pipe. Do not restrict
thermal expansion or movement of vent system.
Maximum support spacing is five (5) feet. Do not
penetrate any part of the vent system with fasteners.
4. Vent length restrictions are based on equivalent
length of vent pipe i.e. total length of straight pipe
plus equivalent length of fittings. See Table 11
for specified vent length details. Do not exceed
maximum vent length. Table 8 lists available
concentric vent components and includes equivalent
vent length for fittings. Do not include vent terminal
into total vent length calculations.
5. Provide and maintain vent pipe minimum clearances
to combustible material. See Figure 2 and Table 10
for details.
6. Provide minimum service clearance between boiler
back and concentric vent exiting through outside
wall, for concentric vent installation/replacement
and/or flue temperature sensor service/replacement,
as follows:
a. For horizontal venting where supplied
Concentric Vent Terminal is attached directly to
installed Boiler Concentric Vent Collar - 6 inches
b. For vertical venting where optional Concentric
Vent 90° long radius elbow is attached to
installed Boiler Concentric Vent Collar - 18
inches
7. Do not install venting system components on the
exterior wall of the building except as specifically
required by these instructions. Refer to Figure 7.
Table 9: Vent System Components included with Boiler
Vent System Components
Part Number
80/125mm Horizontal (Wall) Terminal (ALP080 thru ALP210)
101808-01
100/150mm Horizontal (Wall) Terminal (ALP285 thru ALP399) 101809-01
Vent Pipe Pipe Direction Enclosure
Minimum Clearance To
Combustible Material, Inches
CPVC/PVC Venting Vertical Or Horizontal Enclosed at All Sides
1” Vent/0” Combustion Air
Table 10: Clearances from Vent Piping to Combustible Material