24
VENTING INSTRUCTIONS
INSTALLATION PROCEDURE FOR VENTING SYSTEM THROUGH A WALL
The Vent Termination Must Be Located:
1.
(Refer to figure 9 when determining the location of the vent outlet.)
At least 12 inches (30.4 cm) above finished grade, or at least 12 inches (30.4 cm) above the normally expected snow ac-
A.
cumulation level in geographical areas where snow accumulates.
With a vent termination clearance of at least 12 inches (30.4 cm) from any air openings into a building.
B.
At least 3 feet (92 cm) above any forced air inlet located within 10 feet (305 cm).
C.
At least 12 inches (31 cm) horizontally from electric meters, gas meters, regulators and relief equipment.
D.
For horizontal runs; keep a minimum air space clearance from any combustible material, electric wires, and building
E.
insulation of 2 inches (5.1 cm) for 3" (7.6 cm) vent pipe.
Do not terminate vent over public walkways or over an area where condensate or vapor could be detrimental to regula-
F.
tors, relief valves, or other equipment.
Do not locate the vent termination too close to shrubbery as flue products may stunt growth or kill them.
G.
Some building materials may be affected by flue products expelled near unprotected surfaces. Sealing or shielding of
H.
exposed surfaces with a corrosion resistant material (such as aluminum sheet) may be required to prevent staining or
deterioration.
When installing vent cap secure it to a noncombustible wall or a combustible wall thimble. Fasten vent cap and seal pas-
I.
sage as shown in f
igures 3, 5a and 5b
.
See the National or Canadian Codes listed at the beginning of these instructions for additional information on termina-
J.
tion location.
Horizontal Vent Pipe Lengths
Boiler Size
Vent Pipe Dia
Max Vent Length*
Min Vent Length*
Inlet Pipe
3 Section
3" (8 cm)
30 ft (914 cm) with
condensate tee & 2
elbows.
2 ft (61 cm) with 1
elbow
30 ft (914 cm) with 2
elbows
4 Section
3" (8 cm)
30 ft (914 cm) with
condensate tee & 2
elbows.
2 ft (61 cm) with 1
elbow
30 ft (914 cm) with 2
elbows
5 Section
3" (8 cm)
20 ft (610 cm) with
condensate tee & 2
elbows.
2 ft (61 cm) with 1
elbow
20 ft (610 cm) with 2
elbows
Example: 20 ft (610 cm) of vent pipe with 1 elbow is equivalent to 15 ft (457 cm) of vent pipe with 2 elbows.
*Note: A condensate trap is only required on models over 10 ft (305 cm) of horizontally run vent piping.
!
WARNING
DO NOT INSULATE OR OTHERWISE WRAP
VENT PIPE OR FITTINGS. FOLLOW THE VENT
PIPE MANUFACTURERS INSTALLATION IN-
STRUCTIONS FOR HORIZONTAL VENTING.
National Excelsior Company
www.excelsiorhvac.com
Subject to change without notice.
