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177
VENTILATION — CUSTOM INSERTS
CUSTOM INSERTS PLANNING INFORMATION
CHOOSING THE RIGHT CFM
The power of the cooktop or range, measured in BTU, is perhaps the most
important factor in determining CFM needs for a hood. Professional Gas
Cooktops generally should have 1 CFM for every 100 BTU. For Masterpiece®
Electric and Induction Cooktops, and Gas Cooktops under 60,000 BTU,
choose a blower with a minimum of 100 CFM per 12" of cooktop width.
You should also consider the cooking space and cooking style of your client.
• More demanding cooks usually require more exhaust capacity to handle
moisture generated by boiling large pots of water or the grease and smoke
resulting from grilling or frying. This cooking style could require a hood or
downdraft system with airflow of 600 to 1,300 CFM.
• For those who are used to preparing quick meals in a relatively small
kitchen, a hood with 400 to 600 CFM may be adequate ventilation for the
cooking space.
• If the cooking surface is in a peninsula or island, a larger capacity hood can
provide better capture when there are cross currents and when the hood
needs to be mounted higher. Downdraft ventilation systems are also a
good alternative.
• High heat cooking or aromatic foods may require additional CFM.
Increasing capture area by 3" on each side is also a recommended way to
address this issue.
LENGTH AND SIzE OF DUCTWORK
Do not use flexible duct; it creates back pressure/air turbulence and reduces
performance.
Straight runs and gradual turns are best. Use the shortest route with the
fewest turns possible.
Proper performance is dependent upon proper ducting. Use a qualified and
trained installer. Local building codes may require the use of make-up air
systems when using ducted ventilation systems greater than specified CFM of
air movement. The specified CFM varies from locale to locale. Consult your
HVAC professional for specific requirements in your area.
If using a 10" duct, Thermador recommends not exceeding 150 feet of duct.
Transitions, elbows and wall or roof caps are all factors that will add more
static pressure, therefore increasing your equivalent duct run.
Installation Note: Professional Rangetops and Ranges require that minimum
distances be maintained from the cooking surface to combustible materials
(i.e. a wood covering around the insert). These minimum distances range from
30" to 40" and can vary from product to product and by manufacturer. Refer
to the installation manual of the rangetop or range prior to the design and
installation of the custom hood insert.
WARRANTy
Limited warranty parts and labor (1 year)
See page 294 for additional warranty details.
INSTALLATION CONSIDERATIONS
The information in this design guide provides
key features, product dimensions and installation
specifications. Before installing a Thermador Custom
Hood Insert, be sure to verify the dimensions and
electrical connections. Also, always consult with
the installation manual packed with the product for
complete details before installing.
Professional Custom Series Hood Inserts are designed
for installation with all professional-style cooktops and
ranges. Masterpiece® Custom Series Hood Inserts are
designed for installation with non-professional gas,
electric or induction cooktops. Refer to the appropriate
section for additional specifications.
HOOD WIDTH
The hood width should be no less than the width of the
cooking surface. Where space is not restricted, a wider
hood can be used to increase your capture area.
DISTANCE FROM COOKING SURFACE
Proper mounting height is very important. If a hood
is mounted too low, it may be difficult to cook and be
unsafe. If a hood is mounted too high, performance
may be compromised. For optimal performance, the
distance from the cooking surface to the bottom of the
hood should be a minimum of 30", unless otherwise
noted. Please refer to the installation manual for each
hood and cooktop/range model for proper hood
mounting heights.
CHOOSING THE CORRECT BLOWER
A variety of interior and exterior blower options
Remote, Inline or Integral) are available for Thermador’s
Professional and Masterpiece® Series Hoods. If the unit
you have selected does not have a blower included,
one can be purchased separately. Blower selection
will vary based on the volume of air that needs to be
moved and the length and location of the duct run. For
long duct runs with multiple turns and bends, consider
using a more powerful blower. For the most efficient
air flow exhaust, use a straight run or as few elbows as
possible.
Remote Blowers (VTR Series)
Depending on your preference and ducting situation,
these blowers can be mounted on the roof or exterior
wall of your home. An exterior installation may be more
appealing to reduce noise in the kitchen.
Inline Blowers (VTI series)
To minimize noise in the kitchen, these blowers are
mounted along the duct line anywhere between the
kitchen and the exterior wall. If you have easy access to
your duct line (in an attic, for example), this may be an
appealing option.
Integral Blowers (VTI series)
These blowers are purchased separately and integrated
into the hood or onto the downdraft unit at the time of
installation. This option allows you to select your ideal
hood with the exact power you require.