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First, ascertain the height of the chimney. This includes the
distance from the very top of the smoke dome to where the
top of the flue ends. That is where the smoke leaves the
flue.
Aside from the chimney sections, include all the components
that you will be using in your installation - anchor plate
damper, firestop spacers, stabilizers, and offsets.
Create a Component Height Chart by measuring each
component and completing the following:
Anchor Plate
=
4 ”
Firestop Spacers
=
_ _ _ _ _ _
Support box
=
_ _ _ _ _ _
Stabilizers
=
_ _ _ _ _ _
Offsets
=
_ _ _ _ _ _
Pipe Sections
=
_ _ _ _ _ _
(Stabilizer – Must be present on vertical chimneys every
30 feet and on offset chimneys every 10 feet.)
Take the total height of every component that will be included
in your installation and then subtract that from the desired
total height you wish the finished fireplace system to be.
You will need to refer to the chimney manufacturer’s
information in order to figure out the available lengths and
the quantity of the sections that you will need.
The Special Case of Offset Installation
Special instructions are given for proper handling of offsets for
the chimney system.
Maximum offset is 30 degrees off of vertical and there
should be no more than one offset sequence per chimney
system.
Under no circumstances should two offsets be attached to
comprise a 60 degree offset configuration.
Always maintain at least 2” (two inches) of clearance around
all offset installation for air space and necessary clearance
from combustibles.
Working with Floors and Ceilings
If your offset chimney installation passes through a floor or
ceiling, you will have to use a 30 degree angle offset in which
case you are advised to use a firestop spacer.
Should the length of the chimney below the floor or ceiling be
less than 10’ (ten feet), support the chimney at the juncture of
the floor/ceiling with a stabilizer.
As in all phases of chimney component installation, you will
want to be sure you are making allowances at every juncture for
the 2” (two inch) clearance space from combustibles.
Background Information on Offset Installation
When obstructions are present, it will be necessary to
offset sections of the chimney using the 30 degree offset
component and, for every offset component, two elbow
components.
1.
2.
3.
4.
5.
•
•
•
1.
One elbow begins the installation procedure and the second
elbow is used to finish off each section. In all likelihood, a 30
degree offset elbow will probably be the first hardware used off
the top of the anchor plate damper.
Note:
Under no circumstances should you use an offset
elbow in place of a return elbow. They have distinct purposes
in the configuration of the offset installation and they cannot
be interchanged, part for part.
Depending on the configuration you are contending with,
you may either attach the elbows and offset piping together
or you may need to insert sections of the vertical chimney.
Whatever the scenario, you cannot allow sections of the
chimney to measure more than 20’ (twenty feet) between
the elbows.
Assuming you have sections of vertical pipe that are more
than 10’ (ten feet) measuring between elbows, you must
insert – at midpoint – a chimney stabilizer. When installing
the stabilizer, pull out the support straps with a good amount
of tension and hammer to the frame.
If your offset sections go over 6’ (six feet) in length, you
will need to give added support using a sheet metal screw
– a # 8 x ½” is recommended. The screw will be fastened
underneath the joint.
To ensure a tight fit for the screw, drill a hole that is 1/8”
(one-eighth inch) in diameter right at the chimney joint’s
underside. Be sure that you position the drill at the very
center of where the joint overlaps. Be very careful not to
drill through the inner casting; drill only through the outer
chimney.
Installing Vent Plate and Chimney System
Before installing your B-Vent to the Burntech® Firebox you
must install a steel vent plate. The vent plate mudt be installed
in the vertical (open) position on the outside of the vent pipe
and is designed to close-off the chimney in the event the pipe
is removed or fails, thus alerting the operator of a problem.
Next, attach the masonry anchor plate (supplied). The
anchor plate is pre-drilled with holes for four (4) cement wedge-
anchors.
Place the plate and mark the top of the firebox. Then remove
the plate to carefully pre-drill holes for the wedge anchors.
Using the supplied vent plate, apply a 1/4” (one quarter
inch) bead of gasket cement around the base damper lead
pipe. Apply ceramic rope gasket on to the gasket cement.
Apply balance of gasket cement in a 1/4” (one quarter
inch) bead on top of smoke dome top approx. 3” (3 inches)
outside of outlet hole. Install damper on top of unit pressing
damper into cement. Attach using four (4) #8 cement
wedge-anchors.
2.
3.
4.
5.
1.
2.
3.