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035-17477-002 Rev. D (1202)

16 Unitary Products Group

NOTE: If installing furnace at altitudes between 2000 - 4500

ft., intake and vent pipe length must be reduced by 10 ft. If the

installation requires the maximum allowable intake and vent

pipe length, the furnace must be converted for high altitude

operation. Refer to the proper high altitude application

instruction for details.

VENT TERMINATION (2-PIPE)

Side wall horizontal vent terminals and roof mounted vertical

terminals may be field fabricated. Standard PVC/SRD fittings

may be used. Terminal configuration must comply as detailed

in this section.

NOTE: Combustion air and vent pipes must terminate

together in the same atmospheric zone, either through a roof

or sidewall.

When selecting the location for combustion air/vent termina-

tion the following should be considered:

1. Comply with all clearance requirements as listed below.

2. Termination should be positioned where vent vapors will

not damage plants or shrubs or air conditioning equip-

ment.

3. Termination should be located where it will not be

affected by wind gusts, light snow, airborne leaves or

allow recirculation of flue gases.

4. Termination should be located where it will not be dam-

aged or exposed to flying stones, balls, etc.

5. Termination should be positioned where vent vapors are

not objectionable.

VENT CLEARANCES (2-PIPE) U.S. ONLY

Dryer Vent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ft.

Plumbing Vent Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ft.

Gas Appliance Vent Terminal . . . . . . . . . . . . . . . . . . . 3 ft.*

From any mechanical fresh air intake . . . . . . . . . . . . . . 1 ft.

From any door, window or non-mechanical fresh air or

combustion air intake . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ft.

Above grade and anticipated snow depth . . . . . . . . . . . 1 ft.

Above grade when adjacent to public walkway . . . . . . 7 ft.

From electric, gas meters, regulators and relief equipment -

min. horizontal distance . . . . . . . . . . . . . . . . . . . . . . . . 4 ft.

* Does no t ap ply t o multip le insta lla tions of this f urna ce

model. Refer to “VENTING MULTIP LE

UNI TS " Se ction on pa ge 18 .

NOTE: Consideration must be given for degradation of build-

ing materials by flue gases.

NOTE: Shaded components of the combustion air/vent sys-

tem shown in Figures 18 to Figure 23 are considered to be

part of the termination. These components should not be

counted when determining piping limitations. Sidewall termi-

nation may require sealing or shielding of building surfaces

with a corrosive resistance material to protect against com-

bustion product corrosion.

Tabl e 5:

INTAKE/VENT PIPING 2-PIPE SYSTEM

Models P*DH/

FG9-DH/G9T-DH

Pipe Size

Max. Elbows vs. One Way

Vent Length (Ft.)

Elbow cou nt doe s n ot in clude (2) 90 ° elbows re qu ired

to pipe intake into burn er box or t hose required for the

ter minat ion. Se e Ste p 4 u nd er Com bu stion Air/ Vent

Pipe Sizing

5-30 35 40 60

40 /37 / 1000 / A

2” 654N/A

60 /55 / 1200 / B

80 /75 / 1200 / B

80 /75 / 160 0 / C

100 /95 / 2000 / C

40 /37 / 800 / A

3” 8765

60 /55 / 1200 / B

80 /75 / 1200 / B

80 /75 / 160 0 / C

100 /95 / 2000 / C

1 20 /112 / 200 0 / D 3" O nly 6 5 4 N/ A

NOTE: Accessory concentric intake/vent terminations,

models 1CT0302 and 1CT0303 are available and

approved for use with these furnaces. Refer to Form

650.75-N2.4V for installation details.

In Canada, refer to CAN/CGA-B149.1 or .2 Installation

Code (latest edition - Venting Systems and Air Supply)

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 63 64

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