Thomas & Betts RZ405 5Condensation, 6Vent Terminal Pipe and Vent Cap, Horizontal Vent Terminals

5)Condensation

Any length of single-wall vent pipe exposed to cold air or run through an unheated area or an area with an ambient temperature of 45°F or less must be insulated along its entire length with a minimum of 1/2" foil-faced fiberglass, 1-1/2# density insulation. Where extreme conditions are anticipated, install a means of con- densate disposal.

6)Vent Terminal (Pipe and Vent Cap)

The vent system must be terminated with the type of vent cap approved for use with this heater. The vent cap must be the same size as the vent pipe. Use either a vent cap available from the

Figure 8 - Horizontal Vent Terminals

heater manufacturer (Option CC1) or a field-supplied cap. If the vent cap is field-supplied, use a Type L Breidert Air-x-hauster®or equivalent vent cap. (Type L Air-x-hauster®is a trademark of The G. C. Breidert Company.) Use of a vent cap supplied by the pipe manufacturer is not permitted; the vent cap must be the type approved for use with this heater. A different style vent cap could cause nuisance problems or unsafe conditions.

See the illustrations in Figures 9A and 9B for requirements of vertical and horizontal vent termination. The vent terminal pipe may be either single- wall or double-wall (Type B). If double-wall pipe is used in the vent termi- nal with a single-wall vent run, follow the instructions on page 10 to attach the vent cap and to connect the double-wall pipe to the single-wall vent pipe run.

Single-Wall

Single-Wall Vent

Run and Single-

Wall Terminal

Wall

Approved clearance thimble for single-wall vent pipe is required when flue pipe extends through combustible materials.

Roof or Building Overhang			AdjoiningBuilding
12”	3’(1M) minimum	6’ (2M)
(305mm)
minimum
		minimum	Parapet or

Note position of vent cap openings.

Pitch flue pipe down toward outlet 1/4” per foot for condensate drainage. (NOTE: Applies to entire horizontal vent run.)

Vent Run	Roof or Building Overhang
and Double-
Wall
Terminal
minimum(152mm)6”	12”	(1M)3’ minimum	AdjoiningBuilding
	(305mm)
	minimum
		6’ (2M)
		minimumor
Wall			Parapet
		Note position of

vent cap openings.

Approved clearance	Pitch flue pipe down toward
thimble for single-wall
	outlet 1/4” per foot for con-
vent pipe is required
	densate drainage.
when flue pipe extends
	(NOTE: Applies to entire
through combustible
	horizontal vent run.)
materials. Follow
the requirements
of the double-wall
pipe manufacturer.

Horizontal Vent Terminal Clearances

Follow instructions on page 10 to join single and double-wall pipe and to seal the connection.

A vent cap is required. Maintain a clearance of 12" from the wall to the vent terminal cap for stability under wind conditions.

Products of combustion can cause discolora- tion of some building finishes and deteriora- tion of masonry materials. Applying a clear silicone sealant that is normally used to pro- tect concrete driveways can protect masonry materials. If discoloration is an esthetic prob- lem, relocate the vent or install a vertical vent.

Structure	Minimum Clearances for Vent Termination
	Location (all directions unless specified)
Forced air inlet within 10 ft (3.1m)	3 ft		(0.9m)	above
Combustion air inlet of another appliance					6 ft (1.8m)
Door, window, or gravity air inlet	4	ft	(1.2m) horizontally
(any building opening)	4	ft (1.2m) below
	1	ft (30cm) above
Electric meter, gas meter* and relief	4	ft	(1.2m)		*Do not terminate the vent
equipment	horizontally				directly above a gas meter
Gas regulator*	3	ft	(0.9m)		or service regulator.
Adjoining building or parapet	6	ft	(1.8m)
Adjacent public walkways	7	ft (2.1m)		above
Grade (ground level)	7	ft (2.1m)		above

Figure 9 - Vertical Vent Terminals

Single-Wall Vent

Run and Single-

Wall Terminal

Building	6’ (2M) minimum
Adjoining	Roof Flashing
or	Roof - pitched
	from 0 to 45°
Parapet
	Approved clearance thimble
	for single-wall vent pipe is
	required when flue pipe
	extends through
	combustible materials.

Vertical flue extension to be 6” (152mm) higher than anticipated snow depth but no less than 2 feet (610mm) above the roof.

Vertical pipe extension must be insulated.

Parapet or Adjoining Building

Single-Wall Vent

Run and Double-

Wall Terminal

6’ (2M) minimum

Roof Flashing

Roof - pitched from 0 to 45°

6” (152mm) minimum

Follow instructions on page 10 to join single and double-wall pipe and to seal the connection.

Vertical flue extension to be 6” (152mm) higher than anticipated snow depth but no less than

2 feet (610mm) above the roof.

Approved clearance thimble for single-wall vent pipe is required when flue pipe extends through combustible materials. Follow the requirements of the double-wall pipe manufacturer.

Mfg No. 164771, Page 11