Committed to providing customers with high-quality services, the pursuit of customer satisfaction is our consistent goal.
Shelf life: Within 14 months of product shipment or within 12 months of use
Warranty Description: During the warranty period, according to the requirements of the operating instructions and correct operation and operating conditions, failures caused by poor product quality refer to the warranty content.
After sales service: Malfunctions caused by incorrect connections between product installations and other equipment.
Malfunctions caused by incorrect installation and operation do not comply with the operating instructions.
Malfunctions and breakdowns caused by the use of lubricants not recommended by our company.
Malfunctions caused by incorrect device connections or special specifications.
Malfunctions caused by conversion or structural changes of this product.
Malfunctions caused by mismatched parts selected by the user.
Failures caused by external factors, natural disasters and other insurmountable disasters.
Under normal operating conditions, natural wear and tear, aging bearings, window sashes and other wearing parts. 
