unvented

1. Unvented thermal storage type electric water heater electric immersion heater for attachment to tank vats or similar vessels
   无排气管贮水式电热水器浸入式电加热器，装在水箱、水槽或类似容器上
2. Intervention Installation of a chimney in households in which unvented stoves had been used previously.
   干预在既往没有安装排风系统的家庭中安装烟囱。

adj

1. not provided with vents