A telescopic downdraft is an alternate ventilation system to the range hood. The slide-out hood is another alternative ventilation system from the traditional range hood.
A study of traditional range hoods by the U.S. Environmental Protection Agency concluded that most range hoods do not function very well and may leave harmful carbon monoxide and nitrate particles in the air inside the home. Self-cleaning oven cycles make air especially vulnerable to harmful particles. Some consumers choose to install a telescopic downdraft as a more effective or attractive alternative. When not in use, the telescopic downdraft ventilation system retracts into the cabinet behind the range. It is compatible with both gas and electric ranges.