Heatiator NB3933MI, NB4842M, NB4236M Termination Locations, A. Vent Termination Minimum Clearances

4 Termination Locations

A. Vent Termination Minimum Clearances

WARNING

Fire Risk

Explosion Risk

Maintain vent clearance to combustibles as specified.

•Do not pack air space with insulation or other materials.

Failure to keep insulation or other materials away from vent pipe may cause fire.

	8 ft
	(2.44 m)	Vertical
	Lowest
		wall
	Discharge
Termination	Opening
Cap
Storm Collar		X
		12
Roof
Flashing		Roof Pitch
		is X / 12

H (min.) - Minimum height from roof to lowest discharge opening.

Roof Pitch	H (Min.) Ft.		Roof Pitch	H (Min.) Ft.
Flat to 6/12		1.0*	Over 11/12 to 12/12		4.0
Over 6/12 to 7/12		1.25*	Over 12/12 to 14/12		5.0
Over 7/12 to 8/12		1.5*	Over 14/12 to 16/12		6.0
Over 8/12 to 9/12		2.0*	Over 16/12 to 18/12		7.0
Over 9/12 to 10/12		2.5	Over 18/12 to 20/12		7.5
Over 10/12 to 11/12		3.25	Over 20/12 to 21/12		8.0
	* 3 ft. minimum in snow regions

B-Vent Gas, Wood or Fuel

Oil Termination

			8 ft
		A	(2.44 m)
18 in.			(minimum) to
			Perpendicular
(457 mm)			Wall
	B		(gas only)
Gas
Termination

Termination Caps Staggered Height

	A	Gas Termination				Wood or Fuel Oil Termination
	B	6 in. (152 mm) min.					20 in. (508 mm) min.
			B-Vent Gas, Wood or Fuel
				Oil Termination
										8 ft
									(2.44 m)
								(minimum) to
	Wood or			20 in. min. *				Perpendicular
Gas Termination					(508 mm)					Wall
									(gas only)

Termination Caps Same Height

*If using decorative cap cover(s), this distance may need to be increased. Refer to the installation instruc- tions supplied with the decorative cap cover.

Figure 4.2 Multiple Vertical Termination

Figure 4.1 Minimum Height from Roof to Lowest Discharge Opening

Figure 4.1 specifies minimum vent heights for various pitched roofs.

12 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07