Dyna-Glo GUH50NE/LE Operating Instructions And Owner's Manual page 6

3. Keep the vent connector runs as short as possible
with a minimum number of elbows. Refer to
the (American) National Fuel Gas Code ANSI
Z223.1 or (Canada) CSA B149.1 Natural Gas and
Propane Installation Code for maximum vent and
vent connector lengths. Horizontal run of the vent
connector from the induced draft blower to the
chimney/vent cannot exceed the values in table 2.
NOTE: All joints shall be secured with at least
two corrosion resistant screws. All joints must be
checked for gas tightness after installation.
4. When the length of a single wall vent, including
elbows, exceeds 5 feet (1.5m), the vent shall be
insulated along its entire length with a minimum
of 1/2" thick foil faced fiberglass 1-1/2# density
insulation. If a single wall vent is used in an
unheated area it shall be insulated. Failure to do so
will result in condensation of flue gases.
5. The unit may be vented vertically as a single
appliance or as a common vent with other gas-fired
appliances. In common venting situations, vent
connectors for other appliances must maintain a
4" (100mm) vertical separation between the vent
connectors. Refer to common venting tables in the
(American) National Fuel Gas Code ANSI Z223.1
or (Canada) CSA B149.1 Natural Gas and Propane
Installation Code for proper vent size.
6. Clearance to combustible material is 6" (152mm)
for single wall vent material except where a listed
clearance thimble is used. Clearance to combustible
material for type B-1 vent or factory-built chimney is
per manufacturer's instructions.
7. The vent connector shall be supported without any
dips or sags. Vertical vents shall be supported in
accordance with their listing and manufacturers'
instructions. All horizontal vent connector runs shall
have a slope up to the vertical vent of at least 1/4"
per foot (1mm per 50mm).
8. All vertical type B-1 vents, single wall vents, or listed
chimney lining system must be terminated with a
listed vent cap or listed roof assembly.
9. The vent must extend at least 3' (1m) above the
highest point where it passes through a roof of
a building and at least 2' (0.6m) higher than any
part of a building within a horizontal distance of
10' (3.05m) unless otherwise specified by the
(American) National Fuel Gas Code, ANSI Z223.1
or (Canada) CAN/CGA-B149 Installation Code.
The vent must extend at least 5' (1.6m) above the
highest connected equipment flue collar.
TABLE 2
MAXIMUM HORIZONTAL VENT LENGTHS
No. of Elbows
1
2
3
4
5
Maximum length of vent connector not to exceed 30 ft. (9.1m)
6
GAS UNIT HEATER
Feet m
25 7.6
20 6.1
15 4.6
10 3.0
5 1.5
VENT TERMINATION ON SINGLE WALL VENT
SINGLE WALL TERMINATION
ROOF FLASHING
ROOF PITCHED FROM
0° 45°
TO
SHALL NOT BE A
CONCEALED SPACE
DOUBLE WALL (TYPE B-1) TERMINATION
ROOF FLASHING
ROOF PITCHED FROM
0° 45°
TO
12" MAX
SEAL JOINT BETWEEN SINGLE WALL VENT
AND "B" VENT AND THE ANNULAR SPACE
OF THE "B" VENT
C - HORIZONTAL VENTING - GENERAL
Due to changes to Z83.8/CSA 2.6, the use of single wall
B-Vent is no longer permitted as an acceptable material
when venting horizontally, this change covers both
residential and commercial installations. All horizontally
vented units manufactured after July of 2011 must
be vented as a Caterory III Unit/Utility Heater in
compliance with UL 1738 & ULS636. Common venting
is not allowed when horizontally venting the unit heater.
The minimum horizontal vent length is 3 feet (914mm).
1. If possible, do not terminate the horizontal vent
through a wall that is exposed to prevailing wind.
Exposure to excessive winds can affect unit
performance.
2. Vent termination must be free from obstructions
and at least 12" (306mm) above grade level and
maximum snow height.
3. Do not terminate vent directly below roof eaves
or above a walkway, or any other area where
condensate dripping may be troublesome and may
cause some staining. Avoid windows where steam
may cause fogging or ice buildup.
4. When horizontally vented, minimum clearance for
termination from any door, window, gravity air inlet,
gas or electric meter, regulators, and relief equipment
is 4 ft. (1.2m) for U.S. installations. Refer to NFPA 54/
ANSI Z223.1 in the U.S.A. and CSA B149.1 Natural
Gas and Propane Installation Code in Canada or
with authorities having local jurisdiction. In Canada,
vent termination must have a minimum 6 ft. (1.8 m)
horizontal clearance from gas and electric meters
and relief devices as specified in the Canadian
B149.1, Natural Gas and Propane Installation Code.
2" CLEARANCE
THIMBLE
CLEARANCE TO BE AS
SPECIFIED ON TYPE "B"
VENT PIPE
FIGURE 2