Monessen Hearth HDV500NV/PV manual Below Grade Installations

ventING installation

	You may use a reducer from 5" x 8"
	to 4" x 6B\," for horizontal with vertical
WARNING	rise application. ONLY use framing
	instructions below when using 4" x 6B\,"
	venting.
	If the reducer is installed at the rear of
	the unit, you must immediately follow
	with a 90° elbow for a vertical rise before
	continuing with any horizontal run.

1.Locate and cut the vent opening in the wall. For com- bustible walls first frame in opening.

Combustible Interior Walls: Cut a 11Z\x"H x 9Z\x" W hole through the interior wall.

Combustible Exterior Walls: Cut a 9Z\x"H x 9Z\x"W square hole through the exterior wall frame. Figure 26

Noncombustible Walls:Hole opening should be 7Z\x" (190 mm) in diameter.

2.The center of the hole should line up with the center line of the horizontal rigid vent pipe end. Allow 1/4" minimum

rise per foot. Figure 26

9Z\x"

(241 mm)

9Z\x"

(241 mm)

Framing

Combustible Wall

7Z\x"

(190 mm)

HDV Series Direct Vent Gas Fireplace

Below Grade Installations

When it is not possible to meet the required vent terminal clearances of 12" above grade level, a snorkel kit is recom- mended. It allows installation depth down to 7" (178 mm) below grade level. The 7" (178 mm) is measured from the center of the horizontal vent pipe as it penetrates through the wall.

Ensure the sidewall venting clearances are observed. If venting system is installed below ground, we recom- mend a window well with adequate and proper drainage to be installed around the termination area.

If installing a snorkel, a minimum 24" vertical rise is neces- sary. The maximum horizontal run with the 24” vertical pipe is 36". This measurement is taken from the collar of the fireplace (or transition elbow) to the face of the exterior wall. See the Sidewall Venting Graph for extended horizontal run if the vertical exceeds 24".

1.Establish vent hole through the wall. Page 17, Figure 16

2.Remove soil to a depth of approximately 16" below base of snorkel. Install drain pipe. Install window well (not supplied). Refill hole with 12" of coarse gravel leaving a clearance of approximately 4" below snorkel. Figure 27

3.Install vent system.

4.Ensure a watertight seal is made around the vent pipe coming through the wall.

5.Apply high temperature sealant caulking (supplied) around the 5" and 8" snorkel collars.

6.Slide the snorkel into the vent pipes and secure to the wall.

7.Level the soil so as to maintain a 4" clearance below snorkel. Figure 27

Screws

Firestop

Figure 26 -

VO584-100

Noncombustible Wall

Minimum

4" Clearance

Exterior Wall Framing Dimensions for 4 x 6B\," Venting

NOTE: #1222DA reducer must be used when 4 x 6B\," venting is preferred. Reducer must be installed directly onto unit at pipe adaptor before vertical rise.

56D3048

	Ground
24”	Window
	Well
Minimum
	Gravel
	Drain
	Foundation Wall
FP1965	Figure 27 -
	Below Grade Installation
	21