Multiple Boiler Venting - Venting Layout - Dunkirk DMG-380 Installation, Operation & Maintenance Manual

6.12 Multiple Boiler Venting - Venting Layout

Available pressure at flue outlet is 0.40" w.c. (100pa)
Heat
Heat Input
Capacity
(BTUH) (BTUH)
379,000 348,000
758,000 696,000
1,516,000 1,392,000
2,274,000 2,088,000
*6 in. / 8 in. Vent System:
• Horizontal vent pipe size 6 in. (150 mm)
• Vertical vent pipe size 8 in. (200.00 mm).
• Length between vertical vent pipe and last horizontal
vent collector pipe = 3 ft 4 in (1.00 m).
• For calculating other lengths between last collector
and shaft, length of vertical height must be reduced
by this additional length and by the numbers of bends
according to the table.
Elbow Type 6 in.
- Equivalent Length
45° 5 ft 7 in
90° 13 ft 1 in
6 in. Multiple Boiler Vent Application Example
Elbow Equivalent Length
Number of Elbows
Equivalent Length
Total Equivalent Length
Total Equivalent Length
Horizontal Length
Total Equivalent Horizontal Length
Maximum Vertical Length
Total Vertical Length
6 - COMBUSTION AIR AND VENT PIPING
Number of
Appliances
6 in
(150 mm)
1
2 98.4 ft
4 98.4 ft
6 -
8 in.
Equivalent Length
1.7m 12 ft 3.8 m
4.0m 19 ft 5.8 m
45° 90°
- 3
13 ft 1 in
-
(4.0m)
39 ft 4-21/64 in (12.0m)
39 ft 4 - 21/64 in
(12.0m)
5 ft (1.5m)
44 ft. (13.4m)
98 ft. (29.9m)
54 ft. (16.5m)
Maximum Vertical Length
*6 in / 8 in
(150 / 200 mm)
30m 98.4 ft
30m 98.4 ft
- 98.4 ft
FIGURE 6-26
32
8 in
(200 mm)
30m 98.4 ft
30m 98.4 ft
30m 98.4 ft
PN 240011664, Rev. L [11/01/2020]
30m
30m
30m