L&L VENT-SURE DOWNDRAFT KILN VENT INSTRUCTIONS
ventsure-instruct.pdf
REV: 8/1/2017
Page 9
©
2017
L&L Kiln Mfg, Inc. 505 Sharptown Rd, Swedesboro NJ 08085 856.294.0077 F:856.294.0070 [email protected] hotkilns.com
Usually a slower cool-down is preferred though, so often the
fan is turned off for the cool-down.
High-fire clays and glazes out-gas until the kiln begins to
cool. Once the glaze has set, and the clay has vitrified no
more gasses escape.
The heat in a red-hot kiln is almost all radiant heat. The
hotter the kiln gets, the fewer and fewer air molecules are
even present inside. Because of this- it is only helping the
heating rate a tiny little bit to turn off the vent before the end
of the firing.
How long does a Vent-Sure downdraft vent last?
The Vent-Sure downdraft kiln vent is pulling not only air
but moisture and the products of hot moisture and the
chemicals that are present in the clay. Some of these
products are highly acidic (like sulfuric acid, hydrofluoric
acid and others). The exact amount and composition of
the effluents of your kiln, and hence in the vent, will vary
with how dry your work is and what is in the clay to begin
with. The Vent life seems to be totally dependent on these
conditions. The more moisture and acids created by the
materials in the clay and water then the shorter the vent
life. If you have good conditions the vent can last for many
years - if not - then you will be replacing various parts over
the years.
That said - L&L’s experience has been very positive. We
have sold thousands of Vent-Sures for over 15 years. We
sell very few replacement motors and other parts. The most
vulnerable part seems to be the thin aluminum flexible duct
that goes from the kiln to the vent motor. This is cheap and
you can find replacements locally.
The motors hold up very well in terms of lubrication and
vibration. The Vent-Sure is warranted for three years.
FEATURES AND SPECIFICATIONS
ADJUSTABLE AMOUNT OF VENTING
A sliding adjuster on the vent Bypass Collection Box adjusts
the amount of venting from the system (see photo on page 3).
Vent only what you need to vent - don’t waste heat and energy
by venting more than you need.
EXTERNAL VENTING
External venting is safer and surer than venting to the inside
of your kiln room with a filter.
REMOTE MOUNTING OF MOTOR
The vent blower motor is mounted to a wall plate with a 12”
length of exhaust pipe that mounts on the wall (see photo).
This keeps the heat of the kiln away from the motor (for
longer motor life) and keeps the motor vibration away from
the kiln. (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. If you decide to mount it this way see the
caution on page 5).
MOUNTS ON ANY L&L KILN
The Vent-Sure vent system can be installed on almost any
kiln. It requires only that you drill several small vent holes
through the kiln floor (note that if mounting the bypass/
collection box to the stand, that four studs are factory
installed on the bottom of the stand). Mounting hardware
is included.
Note: L&L Vent-Sure vent are not c-MET-us listed for use
on any kiln except those made by L&L Kiln Mfg., Inc.
POWERFUL VENT MOTOR
The blower vents up to 146 CFM (cubic feet per minute at 0
static pressure and 110 CFM at 0.500-In. static Pressure).
Remember - not all of this air comes from the kiln - some
comes from the Bypass Collection Box.
OUTLET TEMPERATURE UNDER 150
º
F
The outlet temperature of the air is less than 150ºF as long
as you do not exceed the recommended holes in the kiln.
FLEXIBLE DUCT INCLUDED
15 feet of flexible expandable aluminum 3” diameter duct is
included along with necessary hose clamps. Longer lengths
or lengths of 3” stove pipe can be used as well.
LOW ELECTRICITY USAGE
The Vent-Sure vent System uses only 0.75 amps at 120
volts.
VENTS UP TO 20 CUBIC FEET OR MORE
The Vent-Sure vent System was designed to be used with
all L&L model kilns. We recommend one vent system for
kilns up to approximately 20 cubic feet. On larger kilns,
depending on how much venting you need, you may need
more than one vent system. (This really depends on how
much venting you need for your situation). Even our largest
35 cubic feet DaVincis have usually been adequately
vented with one Vent-Sure. Note that you can always add
another vent if you find you need more venting.
