Hearth and Home Technologies LCOR-HVB-CE Minimum Height from Roof to Lowest Discharge Opening

For Vertical Terminations - To locate the flue and install the flue sections:

• Locate and mark the flue centerpoint on the underside of

the roof, and drive a nail through the centerpoint.

• Make the outline of the roof hole around the centerpoint

nail.

• The size of the roof hole framing dimensions depend on the

pitch of the roof. There MUST BE a 25.4mm clearance

from the vertical flue pipe to combustible materials.

• Mark the roof hole accordingly.

• Cover the opening of the installed flue pipes.

To seal the roof hole, and to divert rain and snow from the flue system:

•Attach a flashing to the roof using nails, and use a non- hardening mastic around the edges of the flashing base where it meets the roof.

•Attach a storm collar over the flashing joint to form a water-tight seal. Place non-hardening mastic around the joint, between the storm collar and the vertical pipe.

•Slide the termination cap over the end of the flue pipe and snap into place.

• Cut and frame the roof hole.

• Use framing lumber the same size as the roof rafters

and install the frame securely. Flashing anchored to the

frame must withstand heavy winds.

• Continue to install concentric flue sections up through

the roof hole (for inside flue installations) or up past the

roof line until you reach the appropriate distance above

the roof (for outside terminations).

!WARNING: FOLLOWING NATIONAL REGU- LATIONS AND CODES OF PRACTICE FOR

MINIMUM CLEARANCES FROM GAS TERMINALS, AND PLACEMENT OF GAS TERMINAL.

TERMINATION

CAP

50.8 cm	VERTICAL
	WALL

LOWEST

DISCHARGE

OPENING

X

30.5 cm

ROOF PITCH IS X/ 30.5 cm

H (MIN.) - MINIMUM HEIGHT FROM ROOF TO LOWEST DISCHARGE OPENING

NOTE: This also pertains to vertical flue systems installed on the outside of the building.

Roof Pitch	H (min.)
flat to 6/12	305 mm (1.0 ft.)*
6/12 to 7/12	381 mm (1.25 ft.)*
over 7/12 to 8/12	458 mm (1.5 ft.)*
over 8/12 to 9/12	610 mm (2.0 ft.)*
over 9/12 to 10/12	762 mm (2.5 ft.)*
over 10/12 to 11/12	991 mm (3.25 ft.)
over 11/12 to 12/12	1.2 m (4.0 ft.)
over 12/12 to 14/12	1.5 m (5.0 ft.)
over 14/12 to 16/12	1.9 m (6.0 ft.)
over 16/12 to 18/12	2.2 m (7.0 ft.)
over 18/12 to 20/12	2.3 m (7.5 ft.)
over 20/12 to 21/12	2.5 m (8.0 ft.)

* 91.4 cm minimum in snow regions

Figure 25. Minimum Height from Roof to Lowest Discharge Opening

30 Heat & Glo • PIER/ST/L&RCOR-HVB-CE • 2068-900 Rev. H • 6/07