WARNING: The flow of ventilation air must not be
obstructed.
Horizontal and Vertical Venting Requirements
The maximum horizontal run allowed for the Clarity
Direct vent is 10 feet. the maximum vertical rise and
maximum total vent length is 30 feet. The horizontal and
vertical lengths of venting must fall within the shaded por-
tion of the chart below:
restrictor plates, supplied by harman stove company,
(Part no. G218) may be added in straight vertical instal-
lations only. For each 10' of vertical rise above the first
10', one restrictor plate may be added. no more than two
restrictor plates may be used.
For venting systems that utilize one or two elbows (either
45° or 90°), restrictor plates should not be used.
For the clarity Direct vent, the vent/air intake termina-
tion clearances above the high side of an angled roof are
as follows:
Use Only Approved Venting
the clarity Direct vent Gas heater has been tested and
is listed for installation with specific venting components.
the venting manufacturer's warranty will be voided, and
serious fire, health, or other safety hazards may result from
any of the following actions:
• installation of any damaged venting component.
• Unauthorized modification of the venting System.
• installation of any venting component not manufactured
by an approved manufacturer.
• installation other than as instructed by the venting
manufacturer and the appliance manufacturer.
consult your local building codes before beginning
the installation, and follow the manufacturer's instructions
exactly. the following simpson Duravent Gs 4" X 6 5/8"
venting components are approved for use with the clarity
Direct vent Gas heater.
siMPson Dura-vent coMPonent no.
Basic termination Kit ................................................... 970
Horizontal Termination Kit A
....................................... 971
verticaltermination Kit a ............................................. 973
Horizontal Square Termination Cap
............................. 984
verticaltermination cap ............................................... 983
snorkel termination cap, 36" vertical rise ................. 981
snorkel termination cap, 14" vertical rise ................. 982
vinyl siding standoff ................................................... 950
Wall thimble ............................................................... 942
round ceiling support/Wall thimble cover ............... 940
cathedral ceiling support Box ..................................... 941
storm collar .................................................................. 953
Firestop spacer ............................................................. 963
adjustable roof Flashing, 0/12-6/12 pitch ................... 943
steep roof Flashing, 7/12-12/12 pitch ....................... 943s
Wall strap ..................................................................... 988
Designer series trim Kits ..................... 3951, 3952, 3953,
3960, 3961, 3962
high Wind vertical termination cap ........................... 991
Low Profile Termination Cap
....................................... 980
DIRECT VENT PIPE LENGTHS
Dura-vent coMPonent no.
GaLvaniZeD BLacK
6" length
na
908B
9" length
na
907B
12" length
906
906B
24" length
904
904B
36" length
903
903B
48" length
902
902B
11-14 5/8" adjustable
-
911B
45° elbow
945
945B
90° elbow
990
990B
the clarity Direct vent should be installed with no
more than 12 joints and 2 elbows. the elbows may be either
45° or 90°.
the clarity Direct vent must not be connected to a chim-
ney flue serving any other appliance.
vertical rise (feet)
Horizontal run (feet)
VENTING
Venting terminals shall not be recessed
into a wall or siding.
Roof Pitch
Feet
Meters
Flat to 6/12
1
0.3
7/12 to 9/12
2
0.6
10/12 to 12/12
4
1.2
13/12 to 16/12
6
1.8
17/12 to 21/12
8
2.4
