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SECTION 6: VENTING
9
6.7 Vent Material
Vent material may be single wall 26 ga. (minimum)
galvanized steel or equal thickness stainless steel.
Completely seal all joints, refer to Page 7, Section
6.2.
If penetrating a combustible wall or roof, a listed
thimble with 2" (5 cm) clearance must be used.
Where local codes permit, a single section of type
B-1 vent material may be used at the roof or wall
penetration instead of a thimble. Ensure vent
manufacturer's clearance from vent material is
maintained. Seal annular space of the type B-1 vent
as well as all joints in the remaining vent.
Figure 3: Vent and Roof Detail
Figure 4: Standard Vented Heater - Vertical and Horizontal Vent Termination
Roof
Vent
Terminal
Listed Thimble
Flashing
or Rain Collar
Vent
2" Air Gap to
Combustible Material
Vent
Terminal
4" Dia.Vent
Flashing
(By Others)
Listed
Thimble
(2" Clearance)
Vent Terminal
Vertical
Option
Horizontal
Option
Vent
Listed
Thimble
(2" Clearance)
Flashing
(By Others)
12" (31 cm)
Minimum
Condensate
Trap to Drain
(Optional)
Note: Vent supports
not shown.
90°
Bend
Model Vent Diameter Part Number
UHA 150 - 400 4" (10 cm) 90502102