Converting A Class-A Metal Chimney Or Masonry Chimney To A Direct Vent System; Masonry Chimney - Regency ULTIMATE U39 Owners & Installation Manual

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
brackets 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.
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
the "Rigid Pipe Venting Arrangements" section.
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.
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 chimney
going through the ceiling: A typical conversion of
Place the
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 is attached
to the bottom of the flex pipe. The Top Adaptor
and the Retro Connector are attached to the
existing chimney with sheet metal screws. The
appliance is then connected 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 existing
masonry chimney is shown in Diagram 6. A Top
Adaptor 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. 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 chimney sweep or home inspection
service.
The direct vent system must not be connected
to a damaged factory-built or masonry chimney.
For factory built, zero clearance, and masonry
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 system within the chimney.
Regency U39-10 ULTIMATE Direct Vent Freestanding Gas Stove
®
installation
If the appliance shuts off during operation,
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 CGA 2.17-
M91, Z21.88-2014 • CSA 2.33-2014. test
methods 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 measurement,
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
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