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Use Only Approved Venting
The Clarity Direct Vent Gas Heater has been tested
and is listed for installation with Simpson Duravent GS vent-
ing components. The Simpson Duravent GS warranty will
be voided, and serious fire, health, or other safety hazards
may result from any of the following actions:
• Installation of any damaged Duravent GS component.
• Unauthorized modification of the Duravent GS System.
• Installation of any component part not manufactured or
approved by Simpson Duravent.
• Installation other than as instructed by Simpson Duravent
and the appliance manufacturer.
Consult your local building codes before beginning the
installation, and follow the manufacturer's instructions ex-
actly. The following Simpson Duravent GS 4" X 6 5/8" vent-
ing components are approved for use with the Clarity Di-
rect 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)
WARNING: The flow of ventilation air must not be
obstructed.
Horizontal and Vertical Venting Requirements
The maximum horizontal run allowed for the Clarity Di-
rect Vent is 10 feet. The maximum vertical rise and maxi-
mum total vent length is 30 feet. The horizontal and vertical
lengths of venting must fall within the shaded portion of the
chart below:
Restrictor plates supplied by Harman
(Part No. G218) may be added in straight vertical installa-
tions 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 el-
bows (either 45° or 90°), restrictor plates
should not be used.
For the Clarity Direct Vent, the vent/
air intake termination clearances
above the high side of an
angled roof are as follows:
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
VENTING
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