Generally, information about Size,Air Flow,Voltage of required fans is needed in order to select a right fan for you and provide you a quotation.
Yes, we sincerely suggest that customers should have some samples of required fans for testing because the truly performance of fans can be fully demonstrated after testing is conducted.
The quoted price is based on annual usage quantity. If annual usage quantities increase, please provide the information to our sales.
We will provide you a further discount.