Vermont Casting LHEC30 Common Flue Installations, Liner Installation, Draft Relief Opening

Vermont Castings, Majestic Products LHE Natural Vent Insert

Zero clearance kit minimum clearance to combustibles materials is 1" (25mm) for B Vent (use of single wall vent is not allowed.)

As with any natural drafted appliances, the vent cap must always extend a minimum of 2' (610mm) above any structure within a 10' (3m) horizontal plane. (Fig. 10)

	0 To 10’
	2’ Min.	0 To 10’
	3’
	Min.	(3m)
		2’	3’
		(610mm)
		Min.	(914mm)
			Min.
	Reference
	Point
AC246a
Fig. 10	Example of the 2', 3', 10' rule.

A minimum 12' (3.7m) vent height is required to effectively vent these fire- places.

Common Flue Installations

In some areas it is possible to vent more than one gas appliance into the same flue. You must ensure that the flue being shared has the proper capacity to handle both appliances. Check installation codes for venting capacity information.

As always it is best to check with the authority having jurisdiction prior to commencement of the installation.

Liner Installation

Insert liner from top of chimney through the damper opening and attach to 3" flue collar for LHEC20 and LHER20 and 4" flue collar for LHEC30. For best results use three (3) sheet metal screws and a hose clamp.

For natural draft inserts, packing noncombustible fiberglass insulation around the liner in the damper area will isolate the fireplace cavity from the chimney and prevent drafts and noises during operation.

In case the fireplace opening is only minimum height

(17¹⁄₄" (438mm) for LHEC20 and LHER20; 21" (533mm) for LHEC30) and access from the front is not possible, remove the flue collar plate - unscrew and slide out from the back of the unit. Now attach the liner to the flue collar, lift up and slide flue collar plate back onto the unit top. It is important that the plate is completely inserted and the front screw is fastened again in order to line up the flue outlet and the liner properly. (Fig. 11)

If the fireplace lintel is wider than 8" (205mm), the height of the fireplace opening must be 25" (635mm) to allow for a 90° offset elbow to be installed.

Damper		Chimney Liner
			Damper
		Chimney
Draft		Liner
Hood	Clamp	Screw	Clamp
			ST1354
Fig. 1 Remove flue collar plate and attach to flue collar.

Draft Relief Opening

This insert is equipped with a draft-relief opening which receives its dilution air supply through the opening at the back of the insert. These openings must not be obstructed or entered any way. (Fig. 12)

Test Chimney Draw

1.A "Chimney Draw" test must be conducted before the installation is complete.

2.Close all doors and windows in the home and start exhaust fans in he kitchen and bathroom.

3.Light unit and operate for 5 minutes.

4.Hold an ignited match or cigarette in front of the unit. Refer to drawing for the location of the draft hood opening. (Fig. 12)

5.Check to make sure smoke from the match or cigarette is drawn into the fireplace. If it is not, turn the unit off and check for causes creating the lack of adequate draft.

Test for draft at these two openings.

FP1355

Fig. 12 Hold an ignited match in front of fireplace.

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