Install Firestops, 10 x 12 Hole and Vent Pipe

4. Install Firestops

For Horizontal Runs - Firestops are REQUIRED on both sides of a combustible wall through which the vent passes.

NOTE: Model DVP-TRAP does not need an exterior fir- estop on an exterior combustible wall.

To install firestops for horizontal runs that pass through either interior or exterior walls:

NOTE: The center of the hole is one (1) inch (25.4mm) above the center of the horizontal vent pipe.

•Position the firestops on both sides of the hole previ- ously cut and secure the firestops with nails or screws.

•The heat shields of the firestops MUST BE placed to- wards the top of the hole.

•Continue the vent run through the firestops.

NOTE: There must be NO INSULATION or other combustibles inside the framed firestop opening.

10"

INTERIOR

WALL SHIELD

12"

HEAT SHIELD

TRIM HEAT SHIELD IF TOO LONG, ADD TO SHIELD IF TOO SHORT

EXTERIOR

FIRESTOP

INTERIOR

FIRESTOP

For Vertical Runs - One ceiling firestop is REQUIRED at the hole in each ceiling through which the vent passes.

To install firestops for vertical runs that pass through ceilings:

•Position a plumb bob directly over the center of the verti- cal vent component.

•Mark the ceiling to establish the centerpoint of the vent.

•Drill a hole or drive a nail through this centerpoint.

•Check the floor above for any obstructions, such as wir- ing or plumbing runs.

•Reposition the fireplace and vent system, if necessary, to accommodate the ceiling joists and/or obstructions.

•Cut an 10-inch X 10-inch (254mm X 254mm) hole through the ceiling, using the centerpoint previously marked.

•Frame the hole with framing lumber the same size as the ceiling joists.

	10" (254mm)	10" (254mm)
		10" (254mm)
		CHIMNEY
		HOLE
	NEW	EXISTING CEILING
	NEW	JOISTS
	FRAMING	JOISTS
	MEMBERS
	CEILING
	Figure 17. 10" x 10" Hole & New Framing Members

If the area above the ceiling is NOT an attic, position and secure the ceiling firestop on the ceiling side of the previously cut and framed hole.

NOTE: There must be NO INSULATION or other combustibles inside the framed firestop opening.

JOIST

CEILING

NAILS (4 REQUIRED)

CEILING FIRESTOP

18	Heat & Glo • GEM42 • 371-900 Rev. N • 2/05