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" Cooking produces a host of harmful by-products\u2014heat, smoke, grease and odors\u2014that not only accumulate on surfaces and give the kitchen a dingy appearance but also make the room uncomfortable for someone preparing a meal. The right range hood will keep the air in your kitchen clean and comfortable. Here&amp;#039;s what you need to know to choose a ventilation system that fits your cooktop and your space.  Ups and Downs Any kitchen ventilation system falls into one of two main categories: updraft and downdraft. Updraft systems, the favorite among kitchen-design professionals, install directly over the cooking surface. These devices use a blower to gather vapors that rise naturally during the cooking process and then push them outside through a duct.  Updraft Systems  If you think an updraft system has to be accompanied by a boxy metal hood you&amp;#039;re in for a surprise. Newer models from Miele, GE Monogram and Zephyr utilize what is known as perimeter capture, a system that pulls contaminants to the edges of the hood rather than the center, allowing for slimmer, sleeker designs, such as flat or gently curved panes of glass or metal panels that project out from a wall and fold away when not in use. Gaggenau&amp;#039;s AH 600 ventilator makes use of the Coanda effect, a physical principle that allows it to lift and remove vapors before they escape from the hood. The awninglike device employs two fans instead of one. The first fan, positioned at the front of the ventilator, generates a flow of air that pushes smoke and steam toward the back of the unit, where a second fan pulls them up into the duct-work and out of the house. By comparison, a traditional ventilator uses a single fan to capture vapors and draw them up and out of the house, explains Brian Wellnitz, kitchen ventilation marketing manager for Broan-NuTone, a manufacturer of ventilation products.  Downdraft Systems  Downdraft designs pull air across the cooking surface and down through a duct that leads outside the home. Unlike hoods or canopies, which are purchased separately from a cooktop or stove, these devices are often integrated into the surface of the cooking appliance. Since these units rise no more than 10 inches above the cooking surface, they&amp;#039;re too short to capture vapors rising from a tall pot, and because their methods of capture fight the natural laws of physics, most designers prefer to reserve this type of ventilation for situations where a hood won&amp;#039;t work. &amp;quot;They&amp;#039;re best in kitchens with cathedral ceilings, where the length of the ductwork would be too great to work effectively, or in an island configuration where the homeowner doesn&amp;#039;t want to block the view,&amp;quot; says Arcadio Lainez, director of marketing for Zephyr.  Hoods or downdraft units without ducts leading outside the home are not true ventilation systems. They recirculate air, and have a limited ability to reduce grease, smoke, heat and odors. Pump Up the Volume  Whether updraft or down, the effectiveness of any ventilation system depends on the volume of air the blower can move in one minute in relation to the heat output of your cooking surface. This measure, CFM (cubic feet per minute), generally ranges from 100 to 1,500. To calculate the CFM your cooking surface requires, you need to know its total heat (Btu) output, which can be found in the appliance&amp;#039;s user guide. For example, a range with four 10,000-Btu burners has a Btu output of 40,000. For conventional (less than 60,000 Btu) cooking products, measure the width of the cooking surface in feet and then multiply by 100. For example, a 30-inch (21/2-foot) cooktop requires a 250-CFM system. For 60,000 Btu\u2013plus pro-style appliances, the formula is different: Determine the Btu output and then divide by 100. So a 90,000-Btu cooktop will require a 900-CFM system. In addition to operating at a high enough CFM, the unit must also fit the width of your cooking surface. A 30-inch range requires a hood or downdraft vent that is at least 30 inches wide. If space permits, bigger is better, say manufacturers. The reason is simple physics. The larger the capture area, the less likely grease and odors will escape. &amp;quot;For a 30-inch range, a 36-inch hood is best,&amp;quot; says Wellnitz.  A hood&amp;#039;s depth\u2014the distance it projects from the wall\u2014is also important. &amp;quot;You want to make sure it covers the middle of the front burners,&amp;quot; says Blake Woodall, director of sales for kitchen ventilation manufacturer Vent-A-Hood. &amp;quot;Otherwise steam and vapors will escape every time you use those burners.&amp;quot;  Bonus Features  The newest systems do more than remove smoke and steam. Many have sensors that will switch on the fan automatically when they detect heat rising from the cooking surface. Delayed turn-off keeps the exhaust running for up to 20 minutes after the cooktop has been turned off, ensuring all vapors are removed. Some vents can be tied in to a system that monitors ventilation throughout the home. Broan&amp;#039;s LinkLogic allows kitchen ventilation to work in conjunction with attic ventilation and ceiling fans throughout the home to maintain quality indoor air.  Pricing Guide  Good: $200 to $600 These budget-minded updraft units are perfect for ordinary gas and electric cooktops and stoves. Minimal (150-CFM) outputs mean these models cannot be used with pro-style appliances. Expect a basic awning shape and a limited range of finishes and colors\u2014white, black and biscuit being the standards. Downdraft units begin to appear at the upper end of this price range.  Better: $600 to $1,200 Step up to a more varied selection of up- and downdraft designs, improved features and CFM outputs of 500 or more. Added features like built-in warming lamps, remote control and variable fan speeds are common. Stainless steel and other metal finishes are an option. If you want to create a custom look, this is also where you will start to find power packs, fans, motors and other interior workings sold without an enclosure. You hire a carpenter or metalworker (at additional cost) to make a housing, and end up with a one-of-kind focal point when you&amp;#039;re finished.  Best: $1,200 to $1,800 If design is a primary concern, this is the category to consider. Here, you&amp;#039;ll find sleek units that quietly make a powerful presence without taking up too much space. Blowers with increased CFM capability (600 and up) make these units ideal for pairing with pro-style ranges and cooktops. Extras, like built-in heat sensors and delayed shutoff, make them more functional.  Ultra: $1,800 and up Here, style is the name of the game. Look for elegant European styling and designs that fold up and out of the way when not in use or that are so unobtrusive you hardly notice them. This is where you&amp;#039;ll find use of advanced technologies like the Coanda effect and perimeter capture. When it comes to finish, stainless is the most common, but there are other options. Miele, for example, offers custom colors for their standard designs. See three hot picks for kitchen ventilation systems. "^^<http://www.w3.org/2001/XMLSchema#string>
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