I agree with sir ranic, explain things with the manager na lang sir idoy, and read first your service booklet about the warranty coverage and maintenance services, and also yung air purifier kasi natin ay parang air filter ng ordinary airconditioning system....loooking at the books of Airconditioning and cooling system ng mga mechanicals dito ay absolutely we have to check our filters kasi pagmadumi na yan ay kailangan ipalinis and that is the responsibility of the casa kasi alangan naman na ikay magbaklas di ba sir?sa akin sila muna magbaklas at magpapaturo me then ako na mag-DIY...kagaya ng SCV sir...sila muna at nagpaturo me....then sooner ako na....pagtapos na warranty.....pero sir, try to defend your position and when trying to talk to the manager face to face ay dalhin mo service booklet sir....goodluck po sir and balitaan nu kami.