14
Assembly Instructions - Access Modification
Through-Wall Accesses:
1. Combustion Air Inlet: Combustion air inlet kits though not required
by Isokern may help improve fireplace operation in homes tightly sealed
and with other ventilating appliances installed.
Check local codes for
combustion air inlet requirements.
The following is a general representation of a generic com-
bustion air kit and not a requirement of Earthcore Industries, LLC.
Local building codes prevail and should be checked before
installation.
Generic fireplace combustion air kits typically consist of a
sliding stainless steel access door affixed to a three inch (3”) or four inch
(4”) diameter stainless steel sleeve approximately twelve inches (12”)
long. An exterior vent with dress plate, weather hood and rodent preven
-
tion screen of a maximum one-quarter inch (1/4”) wire mesh completes
the kit. (Figure 20)
The access door is fitted into the finished fire brick lining at
the interior sidewall of the firebox. The twelve inch (12”) long sleeve
can be introduced into the firebox side wall or back wall by core drilling
an appropriately sized hole at the selected firebox location. Keep the
top of the four inch (4”) diameter access hole no more than six inches
(6”) above the finished firebrick floor. The hole size should allow for a
one-quarter inch (1/4”) mortar joint around the air access sleeve for heat
expansion.
The sleeve passes through the firebox wall and must
be connected to metal pipe (by other) - either flexible or rigid - that leads
to the source for outside combustion air, as directly as possible from the
Standard EPA qualified fireplace (Few to no bends) with a maximum
length of sixty feet (60’).
WARNING:
Do not use combustible duct material. Avoid installing
a combustion air inlet where the opening could be blocked by snow,
bushes or other obstacles. Air inlet must terminate a minimum of three
feet below the chimney cap level. Air inlet ducts shall not terminate in
attic spaces.
2. Gas Line Feed: For a fireplace having the provision for installation of
a gas pipe, the provision is intended only for connection to a decorative
gas appliance.
CAUTION:
When using the decorative appliance, the fireplace damper
must be set in the fully open position.
Gas line for gas log sets used in the Isokern firebox can be
routed through the side wall, back wall or floor of the firebox by drilling
an appropriately sized hole using a masonry drill bit.
3. Electrical Line Feed can be routed through the firebox back wall, side
walls or floor by drilling an appropriately sized hole using a masonry
drill bit. Be sure to follow the gas log appliance manufacturer’s explicit
electrical line connection instructions for vented fireplace installations.
Gas line and electric line must be fed through separate access
holes.
CAUTION:
All access holes must be grouted with mortar – after line or
conduit feed - to seal any gaps or cracks around line feed conduits.
FIGURE 22
Firebrick
side
Gas or electric
line
NOTE: Fill any gaps around
line with Earthcore Mortar
Flex duct to fireplace
firebox (all parts non-combustible)
Exterior wall
Exterior air vent
with dress plate
Supply air ventilation
(if required by code)
Typical placement of
gas or electric line
(see detail below)
NOTE: Gas lines and combustion
air ventilation placement can be reversed.
This page used for illustration of systems
only.
