L&L VENT-SURE DOWNDRAFT KILN VENT SYSTEM
Now you can also add vent control to your vent on kilns with L&L Dynatrol Controller !!!
vent control allows you to automatically control the operation of the Vent-Sure
kiln vent with one of the outputs from the DynaTrol. (It
may not be used with kilns with powered bottoms because the same output on the
control is used)
WHAT DOES THE KILN VENT DO?
The L&L Vent-Sure downdraft kiln vent system is designed to pull air contaminated with carbon monoxide and other fumes including those of volatile metals, decals, sulfur oxide, and others in a down draft fashion out of the kiln and then vent it outside or to a central vent system.
This includes the motor, an 8 foot cord with a rocker type On/Off
switch mounted in line in the cord, the inlet duct attached to the
motor, the wall mounting bracket, a 90 degree elbow for mounting on the
end of the outlet pipe (to keep rain water out), the Bypass Collection
Box for attaching to the kiln stand or kiln side along with mounting
hardware for mounting to an L&L kiln stand and one section of 15
foot flexible aluminum duct with hose clamps.
Will the fumes coming through the downdraft kiln vent system damage my plants, the neighborhood pets or disturb the local environment?
No. The fumes and the gases coming from the kiln
have been diluted with enough fresh air to make them
safe for the environment. (L&L NOTE: Do not,
however, place the outlet of the vent below an open
window. Also we have heard of plants near the vent
outlet being affected by the vent fumes so keep this in
mind when locating vent outlet).
Will using the vent cause my firing to take longer?
The L&L downdraft kiln vent system pulls only a very small amount of air out of the kiln, so very little heat is removed and firing times will change very little. For some kilns, a high
firing may take a little longer. The insulation value
and the number of air leaks in the kiln also determine
the length of the firing. (L&L NOTE: We have seen
vents overpower smaller kilns - so it is important to
adjust the amount of venting in some cases. On the
other hand an example of an e23T 7 cubic foot kiln
firing an 85 pound load on Fast Glaze program to
cone 8 took 7 hours and 4 minutes with a vent on and
6 hours and 24 minutes without a vent. The vent was
on the whole time).
WHAT IS INCLUDED WITH THIS DOWNDRAFT KILN VENT SYSTEM?
One (1) wall-mounted blower mounted on a bracket
with vent pipe to go through outside wall and a Motor
Inlet Duct. An 8 foot power cord with an attached
On/Off switch plugs into a 120 volt standard receptacle.
One (1) Bypass Collection Box to be mounted to the
kiln or on the kiln stand, with mounting hardware.
One (1) length of flexible aluminum ducting (expands
to 15 feet).
Two (2) hose clamps.
One (1) 4” diameter 90 degree elbow (for outside the
MOUNTING OF THE VENT BLOWER
The vent blower is mounted on an outside wall or
window, or near an existing exhaust ducting system.
(With the special “Multi-Mounting Bracket” the vent
motor may be mounted on the floor or a wall with the
outlet pointing up and then connected to an existing
vent system or 4” wall outlet). The Bypass Collection
Box mounts to the kiln either on the side of the bottom
kiln section, or underneath the kiln on the kiln stand.
(Jupiter and Easy-Fire kilns have studs on the stands
to accept this box). It covers holes drilled through the
brick. The blower is then connected to the Bypass
Collection Box with the flexible aluminum duct, and
the blower is plugged into a 120 Volt receptacle for
When operating, the L&L downdraft kiln vent system creates a negative pressure (partial vacuum) in both the Kiln and the flexible aluminum duct, so that fumes are pulled out of the kiln as well as out of the flexible duct. No taping of joints is necessary (although it is
OK to do this). Should a leak develop in the duct, air
will be sucked into the duct rather than blown out of
it. This is a major advantage of the L&L Vent-Sure
Normally no holes are necessary in the lid brick for
fresh air inlet as the leaks in most kilns allow sufficient
fresh air to be drawn into the kiln through element end
penetrations, peephole plugs, leaks between the lid and
the top section, leaks between sections, and leaks
between the bottom section and the bottom brick.
Holes may be drilled in the lid brick at any time if later
found necessary. If you decide to drill holes in the lid
start with a 1/4” diameter hole drilled about 4 inches in
from an edge of the lid (and then add other holes as
necessary in the back of the lid and then on the sides).
BE SURE NOT TO DILL ANY HOLES WITHIN 6”
OF THE THERMOCOUPLES. You do not want cold
air flowing onto the thermocouples.
HEAT IS AWAY FROM MOTOR
Other important advantages of the L&L Vent-Sure
downdraft kiln vent system are that the motor, being
mounted away from the kiln (and the floor), will not
pick up brick dust (which could destroy the motor),
will not cause the kiln to vibrate (which can cause
ware to move, damage to the kiln, and misfiring of
cones on a Dawson Kiln Sitter) and will not be
affected by the heat of the kiln. Because the motor is
not under the kiln you can turn the vent off whenever
you want. It is not necessary to keep it on to cool the
motor as in some other kiln vents.