Lennox Hearth LV

The duct system must be installed respecting

the following:

1. Remove the plates closing up the 8” dia.

holes on top of the ﬁreplace. Then, cut

the insulation and remove the plate under

the insulation in order to obtain two 8” dia.

openings. Fix the adaptors on the ﬁreplace

openings by turning clockwise (Figure 20).

2. Maintain at least a 2” (50 mm) clearance

between the ducts and any combustible

material; the required hole size is 13” x 13”

(330 mm x 330 mm).

Exception #1: For the grills, the fram-

ing can be 10-3/4” x 10-3/4” (275 mm

x 275 mm) to provide the clearance as

required by the integral spacers on the

double outlet duct system.

3. The maximum number of elbows in a run

of duct is two.

4. Maintain at least 6-1/2” (160 mm) clearance

from the outlet grill framing to a combustible

ceiling, side wall or mantel.

5. When traversing a combustible wall or ﬂoor,

a ﬁrestop must be installed at the wall or

ﬂoor penetration. The hole size must be

13” X 13” (330 mm x 330 mm).

6. Do not connect the hot air ducts to a central

heating system. Malfunction of the heating

system’s blower will cause the ﬁreplace to

overheat. A furnace duct is only single wall

and not double wall as is required for the

Brentwood™ LV ﬁreplace hot air exhaust.

7. Use only Lennox Hearth Products grills and

components as described in this manual.

Other grills or registers, for example, may be

too restrictive and may overheat the ﬁreplace

or ceiling.

8. Do not use insulated ﬂexible ducts as they

will overheat.

9. Do not use tees or any other components

than the ones speciﬁcally listed here.

10. Never allow the ducting to pitch down as

hot air will be trapped creating a ﬁre hazard.

Never route the ducting downwards.

11. The hot air outlet grills must be installed with

the louvers pointing downwards in order to

prevent overheating adjacent ceilings.

12. Always install the two outlet grills when using

the double hot air outlet kit and blocking the

upper louver of the ﬁreplace.

CENTRAL FORCED AIR KIT (NOT TESTED

UNDER EPA CERTIFICATION)

The knock-outs provided on the back and on

the sides of the Brentwood™ LV ﬁreplace allow

the connection of insulated ﬂexible pipe which

enables you to heat adjacent rooms up

to 50 feet from the ﬁreplace.

The ducting system must be installed as de-

scribed below:

A) Remove the knock-out and cut the insulation.

In the back, there may be another knock-out

to remove under the insulation.

B) Fix the adaptor at the back and/or the side

of the ﬁreplace by twist-locking the adaptor

to the ﬁreplace. You can use more than one

outlet on the ﬁreplace (Figure 23).

C) Attach the 5” ﬂexible pipe, using the collars

provided. Important: Make sure that the

plastic wrapping around the ﬂexible pipe

will not be in contact with the ﬁreplace using

aluminum tape.

D) Route the ﬂexible pipe to the chosen location.

The ducting system can be installed either

in an upper room or in a lower room.

E) Attach the ﬂexible pipe to the fan, using the

collars (Figure 24).

F) Fix the back draft damper to the fan outlet.

G) Attach a ﬂexible pipe to the fan / ﬂexible pipe

adapter (square to round) and stretch it up

to the location where the heat is required.

H) At that point, the ﬂexible pipe can be attached

to any air distribution grill.

I) Install the blower heating and cooling ther-

mostat (HCTW) in that part of the house to

be heated by the hot air duct. The thermostat

can be switched to a cooling thermostat and

installed in the same room as the unit. This

thermostat will turn on the blower when

the room where the ﬁreplace is located

becomes too hot.

This option requires electricity. Make sure that

the connections to the fan have been made

according to the local codes and comply with

their requirements (see instruction provided

with the thermostat).

Figure 23

Figure 24

Adaptor

Insulation

Blower

Tightening Collar

Aluminium Tape

Flex 5” Diameter

Insulated

Flexible

pipe

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE. 15