Thermador VCI236DS Design Manual - Chimney Wall Hoods

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157

VENTILA

TION — CHIMNEY W

ALL HOODS

CHIMNEY WALL HOODS  

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.

•  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.

•  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.

LENgTH AND SIzE OF DUCTWORK

Proper performance is dependent upon proper ducting. Use a qualified and 

trained installer. 

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.

Local building codes may require the use of makeup 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.

WARRANTY

Limited warranty parts and labor (2 year)

See page 308 for additional warranty details.

AVAILABLE CEILINg HEIgHT

The standard ceiling height can vary from region to 

region and in homes built in different eras. Ceiling 

heights, even in the same room, can sometimes vary 

by as much as several inches. Kitchen ceiling heights 

can vary between 7'6" (or 90") to over 10' (or 120").

Before selecting your hood, check your available 

installation space and any extra space that may remain 

after proper installation of your hood and cooktop or 

range. This extra space can be filled using Thermador‘s 

Stainless Steel Duct Cover or Chimney Extension 

Accessories. The space can also be adjusted by raising 

or lowering your hood within the recommended range 

(typically 30" to 36" above the cooking surface).

CHOOSINg THE CORRECT BLOWER

A variety of interior and exterior blower options 

(Remote, Inline or Integrated) 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. 

 Integrated Blowers (VTN 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.

SPECIAL NOTE: Always allow access to the blower for 

serviceability, should it be needed.