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ManualsBrandsThomas & Betts ManualsFanLDAP 1200

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 26

2) Vent Pipe Diameter

and Length

• Use only one diameter of vent pipe on an installation.

• Minimum vent length is 3 feet (1M).

• Minimum of 1 ft (0.3M) of vertical vent required on venter outlet before installing

an elbow.

Vent pipe diameters and maximum vent lengths in the table apply to both Horizontal

and Vertical vents. Add all straight sections and equivalent lengths for elbows. The

total combined length must not exceed the Maximum Vent Length.

Model LDAP heaters are certified as Category III heaters.

WARNING: Each heater requires its own individual vent pipe run

and vent cap. Manifolding of vent runs can cause recirculation of

combustion products into the building. Failure to comply could

result in severe personal injury or death and/or property damage.

Venting must be in accordance with local codes and the National Fuel Gas Code

Z223.1 or CSA B149.1 and B149.2, Installation Code for Gas Burning Appliances

and Equipment. Local requirements supersede national requirements.

These power-vented heaters are designed to operate safely and efficiently with either

a horizontal or vertical vent. Comply with the specific requirements and instructions.

If this heater is replacing an existing heater, be sure that the vent is sized properly for

the heater being installed and that the existing vent is in good condition. A properly

sized vent system is required for safe operation of the heater. An improperly sized

vent system can cause unsafe conditions and/or create condensation. Do not vent into

an existing gravity vent or chimney.

Installation should be done by a qualified agency in accordance with these instruc-

tions. The qualified service agency installing this system is responsible for the instal-

lation.

1) Type of Vent Pipe

The type of vent pipe is determined by whether the vent is horizontal or vertical.

Horizontal • Vent pipe approved for a Category III appliance, OR

• Appropriately sealed 26-gauge or heavier galvanized

steel or equivalent single-wall pipe

Vertical • Vent pipe approved for a Category III appliance, OR

• Appropriately sealed 26-gauge or heavier galvanized

steel or equivalent single-wall pipe

OR, if at least 75% of the equivalent length of the vent run is vertical

• Double-wall (Type B) vent pipe

24. Venting

Venting

Requirements

inches m

inches mm feet M feet M feet M

6 152 45 13.7 15 4.6 7.5 2.3 None

7 178 60 18.3 8 2.4 4 1.2 6" to 7" (152 to 178mm) Increaser

8 203 50 15.2 15 4.6 7.5 2.3 None

10 254 45 13.7 5 1.5 2.5 0.8 8" to 10" (203 to 254mm) Increaser

8 203 50 15.2 15 4.6 7.5 2.3 None

10 254 45 13.7 5 1.5 2.5 0.8 8" to 10" (203 to 254mm) Increaser

Includes one 90° elbow at venter outlet.

1200

8203

400

6152

800

8203

Equivalent

Straight Length

for 45° Elbow

Field-Supplied Taper Type

Connection Required at the Venter

Outlet

Model

LDAP

Size

Venter

Outlet

Diameter

Vent Pipe

Diameter

Maxi mum

Vent Length

Eqi va l en t

Straight Length

for 90° Elbow