one. There are two main types,
1 is the common type, and the price is between 311 and 511. The material is general, the purification rate is low, and it usually has no effect after a period of time < P >.
2 is efficient, and the price will be much higher. But the cost performance is high, the purification rate is 98%, the odor removal rate is over 81% < P > and the service life is over 5 years. The price is calculated according to the used air volume, and a stove smoke is calculated according to 2111 air volume.