Products

To be able to give you benefit and enlarge our business, we also have inspectors in QC Team and assure you our greatest service and products for Chinese Professional High Quality Concealed Installation Door Closer, Our corporation is dedicated to furnishing customers with high and steady top quality products at aggressive price tag, making just about every customer glad with our services and products.
To be able to give you benefit and enlarge our business, we also have inspectors in QC Team and assure you our greatest service and products for China Conclead Door Closer and Door Control, We significantly promise that we supply all the customers with the best quality items, the most competitive prices and the most prompt delivery. We hope to win a resplendent future for customers and ourselves.

They disable the self-closing function of a fire protection door in a controlled way. This means that they keep fire protection doors open, but automatically release them in the event of a fire so that door closers can do their job.

WE ARE DORRENHAUS
WE STARTED AS A FAMILY BUSINESS, OVER 140 YEARS AGO!
Dorrenhaus brand was originated in 1872 in Germany,with the development and progress, Dorrenhaus successor decide to invest door closer factory in China.In 2011,Zhejiang Dorrenhaus Hardware Industrial Co.,Ltd was formally established.

The D4016 Series features a single-piece cast aluminum body and a 1-3/8” heat-treated steel piston, a heat-treated pinion and staked valves. The D4016 Series standard door closer is certified ANSI/BHMA A156.4 Grade 1, is UL listed and is backed by a 10-year warranty.

*In case of unusually high or heavy doors, windy or draughty conditions, or special installations, a large power size of door closer should be used.

Door closers pull doors closed once they’ve been opened and released. They are used on fire doors to help prevent the spread of flames and smoke in the event of a fire. They are also used to keep out drafts and regulate room temperature in interior spaces.

Dorrenhaus comprises R&D center, testing laboratory,manufacturing center and sales dept, has over 10 in-service engineers and research specialists. Since it was founded, developing High performance door control products has always been the objective of Dorrenhaus. Dorrenhaus people have continuously tried to improve product quality, introducing oversea high and new technical equipment,giving our company good technical capabilities. Moreover, all of our R&D engineers has more than 20 years experience in door closer industry.

To be able to give you benefit and enlarge our business, we also have inspectors in QC Team and assure you our greatest service and products for Chinese Professional High Quality Concealed Installation Door Closer, Our corporation is dedicated to furnishing customers with high and steady top quality products at aggressive price tag, making just about every customer glad with our services and products.
Chinese Professional China Conclead Door Closer and Door Control, We significantly promise that we supply all the customers with the best quality items, the most competitive prices and the most prompt delivery. We hope to win a resplendent future for customers and ourselves.