Monessen Hearth 36CDVXTRN Hearth, Framing and Finishing, Hood Installation, Final Finishing

CDVX Series Direct Vent Gas Fireplace

Hearth

A hearth is not mandatory but is recommended for aesthetic purposes. We recommend a noncombustible hearth which projects out 12” (305 mm) or more from the front of the fireplace.

Cold climate installation recommendation:

When installing this unit against a non-insulated exterior wall or chase, it is mandatory that the outer walls be insulated to conform to applicable insulation codes.

Framing and Finishing

Check fireplace to make sure it is levelled and properly positioned.

To mount the appliance:

1.Choose the location.

2.This unit comes with four (4) flanges pre-mounted on both sides of the fireplace to allow two different drywall thicknesses to be used. Flange “A” is for 1/2” drywall while flange “B” is for 5/8” drywall.

3.Bend the desired flanges out 90° on both sides of the fireplace. Slide the fireplace into the framed opening until the flanges contact the front surfaces of the framing. Level the unit and secure it firmly in place.

4.The standoffs are adjustable for different drywall thicknesses. The unit is shipped from the factory at 1/2” (13 mm). Loosen the four (4) screws securing each standoff to the top of the fireplace. Slide the standoff back. Tighten the screws. This yields a 5/8” (16 mm) thick drywall space. Removing the standoff and having the tabs on the standoff face the rear of the unit yields a 3/4” (19 mm) drywall space. (Fig. 5)

NOTE: Drywall must stop at standoffs and not touch top of unit.

Hood Installation

CAUTION: Hood MUST be permanently installed.

1.Remove top louvre. Carefully remove hood from inside top louvre opening.

2.Remove three (3) sheet metal screws in bottom flange of fireplace surround top.

3.Install the hood by aligning the three holes in bottom flange of fireplace surround top. (Fig. 6)

4.Secure hood to bottom flange of fireplace surround top using three screws removed in Step 2. (Fig. 6)

5.Carefully remove protectors under the relief plates on top of the firebox.

6.Replace top louvre.

Flange	Drywall	Flange Location for Desired
Position	Depth	Drywall Depth at Stud Wall

A1/2” / 13 mm

B 5/8” / 16 mm

B A

FP1603

Standoff Location for Desired Finish Wall Depth at
Header	Screws
	Tabs

FP1603a

Fig. 5 Nailing flanges and standoffs.

Hood

Sheet

Metal

Screws

FP1609

Fig. 6 Secure hood to fireplace with sheet metal screws.

Final Finishing

Noncombustible materials such as brick or tile may be extended over the edges of the face of the fireplace. DO NOT cover any vent or grille panels.

If a Trim Kit is going to be installed on the fireplace, the brick or tile will have to be installed flush with the edges of the fireplace.

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