Desa MDVFST installation manual Mdvfst Direct-Ventgas Fireplace, Venting Installation, Continued

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MDVFST DIRECT-VENT GAS FIREPLACE

VENTING INSTALLATION

Continued

3. Attach vent pipe assembly to the fire-

place. Set fireplace in front of it’s per-

manent location to insure minimum

clearances. Mark the wall for a 10"

square hole (for noncombustible ma-

terial such as masonry block or con-

crete, a 7 1/2" diameter hole is accept-

able). See Figure 14. The center of the

4.Apply a bead of non-hardening mastic around the outside edge of the vent cap. Position the vent cap in the center of the 7 1/2" or 10" hole on the exterior wall with the arrow on the vent cap pointing up. Insure proper clearance of 1" to combustibles is maintained. At- tach the vent cap with four wood screws supplied (see Figure 15). Note: Re- place the wood screws with appropri- ate fasteners for stucco, brick, concrete, or other types of siding.

6.Carefully move the fireplace with vent assembly attached toward the wall and insert the vent pipe into the horizontal termination. The pipe overlap should be a minimum of 1 1/4". Apply silicone to the outer pipe connection. Fasten all vent connections with screws provided. Refer to Framing on page 4 for instruc- tions on securing unit to framing or floor.

7.Slide the wall thimble against the inte- rior wall surface and attach with screws provided (see Figure 17).

hole should line up with the center-

line of the horizontal rigid vent pipe.

Cut a 10"x10" (254mm x 254mm)

square hole through combustible ex-

terior wall (7 1/2" [190mm] diameter

hole if noncombustible). Frame as nec-

essary (see Figure 14).

	4" Clamp
Female	7" Clamp
Locking
Lugs
	Spacer
	Spring
Male	4" Flex
	Pipe
Slots

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

For vinyl or stucco siding use vinyl sid- ing standoffs between vent cap and ex- terior wall. The vinyl siding standoff pre- vents excessive heat from melting the vinyl siding material. Bolt the vent cap to the standoff. Apply non-hardening mastic around outside edge of the stand- off instead of the vent cap assembly. Use wood screws provided to attach the standoff. See Figure 16.

5.Slide the wall thimble over the vent pipe before connecting the horizontal run to the vent cap (see Figure 17).

Nut

Apply Mastic

to All Four Sides

Cut Wood or Vinyl Siding Away to Fit Standoff

Wood Screw

Standoff

UP

Bolt

Vent Cap

7" Flex

Pipe

Rigid Vent Pipe Flexible Vent Pipe

Figure 13 - Vent Pipe Connections

Vent Opening

Combustible Wall

10"

(254mm)

10"

(254mm)

(Framing

Apply Mastic to All Four Sides

UP

Wood

Screw

Vent Cap

Figure 15 - Installing Horizontal Vent Cap

Figure 16 - Installing Vinyl Siding Standoff

Interior Wall

Surface

Wall

Thimble

Vent Cap	Screw
(Horizontal

Vent Opening

Detail)

Termination)	Horizontal
	Vent Pipe

Noncombustible Wall

7 1/2" (190mm)

Figure 17 - Connecting Vent Cap with Horizontal Vent Pipe

Figure 14 - Vent Opening Requirements

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