Vent Opening Requirements | Desa VDVF36STN/STP, VDVF36PN/PP instruction

VENTING INSTALLATION

Installation for Horizontal Termination (Cont.)

VENTING INSTALLATION

Continued

Note: Horizontal runs of vent must be supported every three feet. Use wall straps for this purpose.

Flexible vent pipe must be installed with spacer springs every 12". See Figure 16, page 10. All connections must be clamped tightly and sealed with high temperature silicone sealant as speci- fied in the second warning statement on page 9.

3.Attach vent pipe assembly to the fireplace. Set fireplace in front of it’s permanent location to insure minimum clearances. Mark the wall for a 10" square hole (for noncombustible ma- terial such as masonry block or concrete, a 7 1/2" diameter hole is acceptable). See Figure 17. The center of the hole should line up with the center-line of the horizontal rigid vent pipe. Cut a 10"x10" (25.4cm x 25.4cm) square hole through combustible exterior wall (7 1/2" [19.1cm] diameter hole if noncombustible). Frame as necessary (see Figure 17).

4.Noncombustible Exterior Wall: Apply a bead of non-harden- ing mastic around the outside edge of the vent cap. Position the vent cap in the center of the 7 1/2" hole on the exterior wall with the arrow on the vent cap pointing up. Attach the vent cap with four wood screws provided (see Figure 18). Note: Replace the wood screws with appropriate fasteners for stucco, brick, con- crete, or other types of siding.

WARNING: Do not recess vent termination in to any wall. This will cause a fire hazard.

Figure 17 - Vent Opening Requirements

Vent Cap

Wood Screw

Figure 18 - Installing Horizontal Vent Cap (Noncombustible Exterior)

Combustible Exterior Wall: For vinyl siding, stucco, or wood exteriors, a siding standoff must be installed between the vent cap and exterior wall. The siding standoff prevents excessive heat from damaging siding materials. Siding materials must be cut to accommodate standoff. Bolt the vent cap to the stand- off. Apply non-hardening mastic around outside edge of the standoff. Position the standoff/cap assembly in the center of the 10" square hole and attach to exterior wall with wood screws provided (see Figure 19). The siding standoff must sit flush against the exterior fascia material.

5.Combustible Exterior Wall Only: Slide the interior wall firestop over the vent pipe before connecting the horizontal run to the vent cap (see Figure 20).

6.Carefully move the fireplace with vent assembly attached to- ward the wall and insert the vent pipe into the horizontal termi- nation. The pipe overlap should be a minimum of 1 1/4". Fasten all vent pipe connections (except vent cap) with screws pro- vided. Refer to Framing on pages 6 and 7 for instructions on securing unit to framing or floor.

7.Combustible Exterior Wall Only: Slide the wall firestop against the interior wall surface and attach with screws pro- vided (see Figure 20).

Cut Vinyl Siding

Away to Fit Standoff

		Standoff
		Wood Screw
		Vent Cap
		Bolt
	Apply Mastic
	to All Four Sides
	Figure 19 - Installing Vinyl Siding Standoff (Combustible
	Exterior Wall)
		Interior Wall
		Surface
		Interior Wall Firestop
		(Combustible
		Exterior Wall Only)
		Horizontal
		Vent Pipe
	Vent Cap	Screw
	(Horizontal	Screw
	(Horizontal
	Termination)