Downdraft
Ducting
Guide
® |
T H E S I G N O F A G R E A T C O O K ® |
Important Information
Dealer
Installer
Model and Serial Numbers
Equivalent Length
Fittings Required |
Questions
Introduction
Jenn-Air downdraft ranges and cooktops will adapt
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to various |
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locations. The blower assem- |
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bly is |
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runs up to 60 equivalent feet. |
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When |
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installation, please refer |
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to this |
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that all of the ducting needs |
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will be met |
refer to the product and duct- |
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ing installation |
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included with the Jenn- |
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Air product |
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Jenn-Air downdraft ventilation systems are |
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designed |
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at a high rate of speed. High |
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speed air |
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the exhausting of smoke |
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and fumes |
hold grease and moisture in sus- |
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pension |
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the home. |
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Cooktop Example
The downdraft cooking system operates on the principle of localized or “proximity” ventilation. This system creates a high velocity exhaust air pattern near the cooking surface. The air movement is created by a blower motor and squirrel cage fan blade encapsulated by a blower scroll. This scroll is aligned with a plenum chamber. On cooktops, the scroll is attached directly to the plenum chamber. On ranges it mounts remotely under the range. Since this system differs from the familiar forced-air heating and air conditioning system you may have in your home that uses low velocity air flow, the Jenn-Air system will require different duct work design techniques.
This guide will take you step-by-step through the planning process and will assist you in determining the types of materials needed to properly install a Jenn-Air product.
The goal of the system is to maintain the proper amount of airflow to efficiently pull smoke and other cooking fumes to the outside without pulling excessive air across the cooking surface. Too little air movement will result in a smoke filled kitchen while too much air movement will result in pro- longed cooking times due to cooled off food.
The equipment design is flexible enough that the ducting can be done simply with up to three turns (elbows) and not rely on fancy sheet-metal work.
S T E P1 Environment
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When considering the location for a Jenn-Air prod- |
cabinets or walls is 6”. However, the minimum |
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uct, environmental influences that can affect ventila- |
clearance can be from 2 inches for cooktops to 1 |
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tion performance must be considered. |
inch for ranges. Please refer to the installation |
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Make-Up Air - The air that is exhausted by the unit |
instructions for the particular product. |
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must be replaced. If a room or house is too “tight”, |
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the unit may not vent properly. If a house or room is |
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too tight, it will be necessary to introduce more air |
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into the environment. Some air conditioning and |
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heating units allow for make-up air. |
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Air Movement - Any other air movement devices |
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such as, ceiling fans, air conditioner registers, etc. |
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can create air currents which interfere with down- |
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draft ventilation. |
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Adjacent Cabinets - Cabinets that are closer than |
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the minimum distance allowed can create dead air |
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pockets that impair performance. For maximum |
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performance, the recommended distance to adjacent |
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