Roberts Gorden 350, 200, 150, 400, 300, 175, 225 250 service manual Vent Material, Vent and Roof Detail

SECTION 6: VENTING

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

Vent
Terminal
	Flashing
	or Rain Collar
Roof
	Listed Thimble
2" Air Gap to	Vent
Combustible Material

Figure 4: Standard Vented Heater - Vertical and Horizontal Vent Termination

	Vent Terminal
Flashing
(By Others)
Listed
Thimble
(2" Clearance)
4" Dia.Vent		Listed
Vertical	90°	Thimble
		(2" Clearance)
Option	Bend	Flashing
	Horizontal
		(By Others)
	Option
	Vent		Vent
			Terminal
	Condensate	12" (31 cm)	Note: Vent supports
		Minimum
	Trap to Drain		not shown.
	(Optional)

Model	Vent Diameter	Part Number
UHA 150 - 400	4" (10 cm)	90502102

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