Common Flue Installations; Liner Installation; Draft Relief Opening; Test Chimney Draw - Vermont Castings LHER20 Installation Instructions & Homeowner's Manual

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.
3'
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)
10005360
Vermont Castings, Majestic Products LHE Natural Vent Insert
0 To 10'
(3m)
2'
3'
(610mm)
(914mm)
Min.
Min.
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
Draft
Hood
Clamp
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.
Fig. 12 Hold an ignited match in front of fireplace.
Chimney Liner
Damper
Chimney
Liner
Screw
Clamp
ST1354
Test for draft at these two
openings.
FP1355
9