Requirements vary depending on screen size, but any 42-inch Energy Star–rated TV, for example, must use less than 208 watts.
但举例来说，任何能源之星认证的42寸电视，它的能耗必定低于208瓦特。
2
Rated for about 1000 square feet, it USES a large carbon bed and a safe HEPA filter to remove chemicals and particles down to. 3 microns in size.
规定为1000平方英尺，使用大块的碳质底座和安全的HEPA过滤器将化学药品和微粒降到3微米以下。
3
Two key parameters are the size of the smallest particle the filter traps (the best are 0.3 micron) and the efficiency of gases the filter removes, rated at 95, 99 or 99.97 percent.