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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 sup-
port you may find it difficult to
screw it in place because it is fairly
small inside.
Simpson Dura-Vent has provided angle
brackets with this support which can be
screwed to the outside of the support box
and nailed to surrounding framing as re-
quired. 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
flashing 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 Dia.
12, local codes or page 11. 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".
The extension is attached to the support using
the eight metal screws provided. Be sure there
is at least a 2 inch overlap where the extension
joins the support.
Regency U39 ULTIMATE Direct Vent Freestanding Gas Stove
CONVERTING A
CLASS-A METAL
CHIMNEY OR
MASONRY CHIMNEY
TO A DIRECT VENT
SYSTEM
General
There are two different types of direct vent
conversion systems listed below. Follow the
appropriate directions for your installation.
A) Through an existing factory built metal chim-
ney going through the ceiling: A typical
conversion of this type is shown in diagram
1. The concept of direct vent conversion is
to connect an adaptor to an Underwriters
Laboratories (UL) listed 4 inch diameter
aluminum flex pipe which is then passed
down through the center of the existing
metal chimney system. Three sizes of Top
Adaptors are available from Simpson Dura-
Vent. The Retro Connector (909B) is at-
tached to the bottom of the flex pipe. The Top
Adaptor and the Retro Connector are at-
tached to the existing chimney with sheet
metal screws. The appliance is then con-
nected to the chimney with appropriate
black direct vent pipe and an adjustable
length section.
B) Through the wall of an existing masonry
chimney: A typical conversion of an exist-
ing masonry chimney is shown in Diagram
6. A Top Adaptor (985K) and Flashing are
used at the top of the masonry chimney. The
4 inch aluminum liner is connected to the
adaptor and is passed down the chimney
and out through the masonry wall and
attached to the Retro Connector (909B).
The Retro Connector is attached to the
masonry wall and then connected to the
direct vent pipe leading to the appliance.
Prior to installation and connection of the
vent system to a factory-built or masonry
chimney, the chimney must be inspected
and thoroughly cleaned by a qualified
service person, such as a certified chim-
ney sweep or home inspection service.
The direct vent system must not be con-
nected to a damaged factory-built or ma-
sonry chimney.
For factory built, zero clearance, and ma-
sonry chimneys cleanout doors and caps
or plugs for cleanout tee fittings and ash
dumps shall be secured in place and
sealed before installing a Direct Vent sys-
tem within the chimney.
INSTALLATION
If the appliance shuts off during opera-
tion, contact a qualified service person to
determine if a negative pressure and/or
leaky chimney condition exists. Do not
operate the appliance until the problem
is corrected.
Approved for US Installations Only
The use of an existing chimney as an air
intake is not covered under the ANSI
Z21.88b-1999, CSA 2.33b-M99 test meth-
ods and the resulting ITS/WHI product
certification. The code Authority Having
Jurisdiction must be consulted prior to
proceeding with this installation method.
Converting a Factory Built Metal
Chimney
1) Remove the existing chimney cap.
2) Measure the distance from the top end of
the chimney to the bottom of the ceiling
support box, add 3" (76mm) to this meas-
urement, and cut a section of the 4" flex pipe
to that length (the flex should already be
extended to its nominal length).
Diagram 1
3) Connect the end of the
flex pipe section to the
underside of the Top
Adaptor using 3 sheet
metal screws.
Diagram 2.
Diagram 2
19
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