A1 MINI中间的小盒子，内部可以填充1.5mm及上大小的活性炭球，前盖可以放小米小号的温度计，也可以用替换件上一个4cm风扇来加快活性炭周围的空气循环。

The small box in the middle of the A1 MINI can be filled with activated carbon balls of 1.5mm and above. The front cover can hold a small Xiaomi thermometer. You can also use a 4cm fan on the replacement part to speed up the air circulation around the activated carbon.