This type of wear and tear is due to dust flue gas on the local erosion caused by the filter bag, indicating the local flow of air filter too large.
Lolu hlobo lokugqoka nokudilizwa kungenxa yothuli lwe-flue gesi ekuguguleni kwasendaweni okubangelwa yisikhwama sokuhlunga, okubonisa ukuhamba kwendawo yokuhlunga komoya kukhulu kakhulu.