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installation
Round Support (RDS) & Square
Support (SQS)
If your home has a cathedral ceiling (no attic space
between the ceiling and the roof), install the chimney
and support as follows.
1) Situate the chimney in a convenient location as
near as possible to the appliance outlet. Cut
and frame a hole in the roof for the support.
The sides of this hole must be vertical with 1
1/4" (32mm) clearance.
2) Place the support in the opening. Lower it to
the correct height as determined by the table
and diagram below.
Slope
0/12
- 2/12
2/12
- 7/12
5-1/2"
7/12
- 12/12
6-3/4"
12/12 - 24/12
7-1/2"
24/12+
12-1/2"
Using a level, make sure the support is vertical.
If the support extends above the roof, cut it
flush with the top of the roof. Nail the support
to the frame opening using (8) 3" spiral nails
or #8 x 1-1/2" screws.
Note: If you are using a 6" square support you
may find it difficult to screw it in place
because it is fairly small inside.
Simpson Dura-Vent has provided angle brack-
ets with this support which can be screwed
to the outside of the support box and nailed
to surrounding framing as required. Use a
minimum of four #8 x 1/2" screws per bracket.
In some cases these brackets may need to be
trimmed (e.g.: to fit under a flashing). Place the
Finish Collar around the support and fasten it
to the ceiling using the screws provided.
3) Use appropriate roof flashing. Place the flash-
ing under the upper shingles and on top of the
lower shingles approximately half of the flashing
should be under the shingles.
4) Assemble the desired lengths of Black Pipe and
Elbows necessary to reach from the appliance
adaptor up through the support box and flashing
to proper height as per Diagram 12, local codes
or the "Exterior Vent Terminal Locations" section.
32
Ensure that all pipe and elbow connections are
in their fully twist lock position.
5) Ensure vent is vertical and secure flashing to the
roof with roofing nails. Slide the storm collar
over the pipe section and seal with a mastic.
6) Twist lock the vent cap on to the last section.
Support Extensions - Round
(RDSE) or Square (SQSE)
Steep pitched cathedral ceilings may require the
use of a support extension. This piece fits down
inside the support and can be adjusted to increase
the support's length by up to 22" (559mm). The
extension is attached to the support using the
eight metal screws provided. Be sure there is at
least a 2" (51mm) overlap where the extension
joins the support.
Gas Connection
The gas connection is a 3/8" NPT 90
gas line can be rigid pipe or to make installation
easier, use a listed flexible connector and/or cop-
per tubing if allowed by local codes. Since some
municipalities have additional local codes it is always
best to consult with your local authorities and the
"X"
CAN/CSA B149.1 installation codes.
4"
For USA installations follow local codes and/or the
current National Fuel Gas Code, ANSI Z223.1.
When using copper or flex connectors use only
approved fittings. Always provide a union so that
gas lines can be easily disconnected for burner
and/or valve servicing. Flare nuts for copper lines
and flex connectors are usually considered to meet
this requirement.
I
MPORTANT: ALWAYS CHECK FOR GAS
LEAKS WITH A SOAP AND WATER SOLU-
TION OR GAS LEAK DETECTOR. DO NOT
USE OPEN FLAME FOR LEAK TESTING.
Note: Prior to any pressure testing of the gas
supply piping system that exceeds test
pressures of 1/2 psig, this appliance must
be disconnected from the piping system.
If test pressures equal to or less than 1/2
psig are used then this appliance must
be isolated from the piping system by
closing its individual manual shut-off
valve during the testing.
SYSTEM DATA - H35U-NG
For 0 to 4500 feet altitude
Natural Gas
Max. Input Rating
Min. Input Rating
Orifice Size
Propane
Max. Input Rating
Min. Input Rating
Orifice Size
Supply Pressure
Natural Gas
Propane
Manifold Pressure
Natural Gas
Propane
o
elbow. The
Hampton® H35U Direct Vent Freestanding Gas Stove
30,000 Btu/h
21,500 Btu/h
#37 DMS
29,500 Btu/h
24,000 Btu/h
#52 DMS
min. 5.0'' w.c.
min. 11'' w.c.
3.5'' +/- 0.2'' w.c.
10'' +/- 0.2'' w.c.
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