Lennox International Inc G50UH-36B-090, G50UH-48C-110, G50UH-60D-135 and Combined Vent Connector

Common Venting Using Tile-Lined Interior Masonry Chimne

MINIMUM LENGTH = AS SHORT AS PRACTICAL.

FOR MAXIMUM LENGTH SEE NOTE TO LEFT

NOTE- Refer to provided venting tables		J
for installations in the USA and the
venting tables in current CSA B149 for
installations	in Canada.	_
		m

FU

OTHER

APPLIANCE

_Row

'and Combined Vent Connector

J

INTERIOR TILE=LINED

MASONRY CHIMNEY

NOTE - the chimney must be properly

sized per provided venting tables or lined with listed metal lining system.

PERMANENTLY

SEALED FIREPLACE

OPENING

NOTE - Either single-walled or double-walled vent connector may be used. Refer to the capacity requirements as shown in the pro- vided venting tables for installations in USA and the venting tables in current CSA B149 for installations in Canada.

FIGURE

18

,IMPORTANT

Never connect a Category I appliance to a chimney that is

servicing

a solid-fuel appliance.

If a fireplace

chimney flue

is used to vent this appliance, the fireplace opening must

be permanently

sealed.

A type B or listed chimney lining system that passes

through an unused masonry chimney flue is not considered

to be exposed to the outdoors.

General

Venting

Requirements

Vent all G50UH(X) furnaces according to these instruc-

A fan-assisted furnace may be commonly vented into an

tions:

1 - Vent diameter recommendations and maximum allow-

existing lined masonry chimney if the following conditions

able piping runs are found in the provided venting tables

are met:

for the USA, and the appropriate venting tables in the

• The chimney is currently serving

at least one drafthood

standards of CSA B149 Natural Gas and Propane

equipped

appliance

Installation

Codes for Canada.

• The vent connectors and chimney are sized accord-

2 -

In no case should

the vent or vent connector

diameter

ing

to the provided

venting tables

for the USA, and

be less

than the

diameter

specified

in

the

provided

the

appropriate

venting

tables

in

the standards

of

CSA

B149

Natural

Gas

and

Propane

Installation

venting

tables for the USA, and the appropriate venting

Codes

in Canada.

tables in the standards

of CSA B149 Natural Gas and

If type B1 double-wall vent is used inside a chimney, no oth-

Propane

Installation Codes

for Canada.

er appliance

can be vented into the chimney. The outer wall

3 -

Single appliance

vents -If the vertical vent or tile-lined

of type B1 vent

pipe must not be exposed

to flue products.

chimney

has a larger

diameter or flow

area

than the

A type B1 vent or masonry chimney liner shall terminate

vent connector, use the vertical vent diameter to de-

termine

the

minimum

vent capacity

and

the vent

above the roof surface with a listed

cap or a listed roof as-

sembly according to the terms of their respective listings

connector diameter to determine the maximum vent

and the vent manufacturer's instructions.

capacity,

The flow area of the vertical

vent,

however,

When inspection reveals that an existing chimney is not

shall not exceed 7 times the flow area of the listed ap-

pliance

categorized vent area, drafthood

outlet area or

safe for the intended purpose,

it shall be rebuilt to conform

to nationally

recognized

standards,

lined

or

relined

with

flue collar area unless designed according

to approved

suitable

materials,

or replaced

with a gas vent

or chimney

engineering

methods.

suitable

for venting

G50UH(X)

series units. The chimney

4 -

Multiple

appliance

vents - The flow area

of the largest

passageway

must be checked

periodically to ensure that it

section

of vertical

vent

or chimney shall not exceed 7

is clear and free of obstructions.

times the smallest listed appliance categorized vent

Do not install

a manual damper, barometric

draft regulator,

area, drafthood outlet area orflue collar area unless de-

or flue

restrictor

between

the furnace and

the chimney.

signed according to approved engineering

methods.

Page 14