Hi my friend,
Thanks for your contact and purchase.
After reading carefully, we understand that there is a noise coming out from one of your air purifiers.
Regarding an air purifier, the motor won't be fixed tightly; there is a certain clearance left for the motor to rotate the fan.
Therefore, we highly appreciate your kind understanding that an air purifier can't be completely sound-free.
By tests, the noise level of this type is 24db51db( lowest speedhighest speed), which belongs to white noise.
But if the noise level of your air purifier exceeds the above mentioned, there may be something wrong with your air purifier.
And generally, this abnormal noise may result from the following factors:
1) The airflow is blocked by packaging;
2) The air purifier in an inclined place making the fan blades rub with the air purifier’s lining;
3) Foreign objects may be inside;
4) The motor may be damaged for the improper transportation of the carrier;
5) The filter serves so long that needs to be replaced ( pollutants blocked the filter and strengthened the resistance of air);
6) The clearance of the motor is increased for the long service time that the motor becomes loose occurring noises;
Could you please help us check the above-mentioned factors?
And if the air purifier is a damaged one, it's our great honor to awaken your 5-year warranty: a new item for free or the full refund will be achieved based on your choice.
Meanwhile, to lead a specific service and make a record, we'll appreciate it if you can let us know your order ID.
We sincerely apologize for the great inconvenience caused to you and highly appreciate your kind understanding.
Your 100% satisfaction is our goal;
any other needs or puzzles, please feel free to let us know. Please be rest assured that a perfect solution will be offered based on all your ideas!
Could you please let us know which solution do you prefer in the following ways?
Again, we sincerely apologize for the great inconvenience caused to you and highly appreciate your kind understanding!
Look forward to your reply soon.
Please be rest assured that a perfect solution will be offered right away based on all your ideas!
PS: for Amazon policies, we highly appreciate your kind understanding that we're unable to contact you directly or offer real links, email addresses. Please contact us actively for giving us the chance to offer efficient help!
And towards the damaged one, could you please help us return the damaged one to our individual warehouse ( not the Amazon warehouse) in case of a re-sale by Amazon staff?
Customer First is our main principle, we must be responsible for each of our customers. And we'll create a prepaid shipping label to free you from the worry about the shipping fee.