Outside the security filter air filter filter brand: SANY HUAWEI, models: B222100000534 B222100000534 / P181046 / P181046/114215-0340 / 114215-0340, the original factory package number: B222100000534 P181046/114215-0340, applicable models: SY305 / SY335 / SY280R/SY310R