Shenzhen Hongfa Automatic Door Co, Ltd. attaches great importance to the raw materials of high speed spiral door-fire exit door. Apart from choosing low-cost materials, we take the properties of material into consideration. All the raw materials sourced by our professionals are of the strongest properties. They are sampled and examined to ensure they comply with our high standards.. With the rapid globalization, delivering a competitive Hongfa brand is essential. We are going global through maintaining brand consistency and enhancing our image. For example, we have established a positive brand reputation management system including search engine optimization, website marketing, and social media marketing.. At Hongfa Automatic Door, we offer expertise combined with personalized, one-on-one technical support. Our responsive engineers are readily accessible for all of our customers, large and small. We also provide a wide array of complimentary technical services for our customers, such as product testing or installation..