Products

Reliable quality and good credit standing are our principles, which will help us at a top-ranking position. Adhering to the tenet of “quality first, customer supreme” for OEM China China American Design UL Listed Extra Heavy Duty Adjustable Commercial Door Closer D9016, The team of our firm together with the use of cutting-edge technologies delivers impeccable quality merchandise supremely adored and appreciated by our prospects around the world.
Reliable quality and good credit standing are our principles, which will help us at a top-ranking position. Adhering to the tenet of “quality first, customer supreme” for China Lcn Door Closer, Ul Listed Door Closer, We honor ourselves as a company that comprises of a strong team of professionals who are innovative and well experienced in the international trading, business development and product advancement. Moreover, the company stays unique among its competitors due to its superior standard of quality in production, and its efficiency and flexibility in business support.

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.

Reliable quality and good credit standing are our principles, which will help us at a top-ranking position. Adhering to the tenet of “quality first, customer supreme” for OEM China China American Design UL Listed Extra Heavy Duty Adjustable Commercial Door Closer D9016, The team of our firm together with the use of cutting-edge technologies delivers impeccable quality merchandise supremely adored and appreciated by our prospects around the world.
OEM China China Lcn Door Closer, UL Listed Door Closer, We honor ourselves as a company that comprises of a strong team of professionals who are innovative and well experienced in the international trading, business development and product advancement. Moreover, the company stays unique among its competitors due to its superior standard of quality in production, and its efficiency and flexibility in business support.