35
A13305
Fig. 40 -- Combustion Air and Vent Pipe Termination for Direct Vent (2--Pipe) System
A05091
Fig. 41 -- Vent Pipe Termination for Non--Direct Vent and Ventilated Combustion Air System
Table 12 – Vent Termination Kit for Direct Vent (2--pipe) Systems
Vent and
Combustion Air
Pipe Diameters
Approved Two---Pipe Termination Fittings
Allowable
Concentric Vent
Kit
1 1/2---in.
(38 mm)
2---in.
(51 mm)
2 1/2---in.
(64 mm)
3---in.
(76---mm)
4---in.
(102 mm)
1 1/2---in. (38 mm)
No
Yes
No
No
No
2---in. (51 mm)
2---in. (51 mm)
No
Yes
No
No
No
2---in. (51 mm)
2 1/2---in. (64 mm)
No
No
No
Yes
No
2---in. (51 mm)
3---in. (76 mm)
3---in. (76---mm)
No
No
No
Yes
No
3---in. (76 mm)
4---in. (102 mm)
No
No
No
Yes
Yes
3---in. (76 mm)