Internal Overhead Concealed Door Closer , 3 Hours Fire Rating Hold Open Door Closer

Internal Overhead Concealed Door Closer , 3 Hours Fire Rating Hold Open Door Closer

• UL 228 standard, tested life cycles of 200,000 plus
• SKILLED CRAFT: even running, oil tight, noiseless
• Two screws adjusting closing and latching speed

Internal overhead concealed door closer D30, with stronger spring strength,

the closing power is of size 3, suitable for max. internal door width 950mm

or door weight 65kg. Normally if the door width is less than 950mm, then

max. door weight of 80kg will be applicable.

Ω UL listed light duty overhead concealed door closer for commercial use

Ω Precised cast aluminum body, anodized aluminum sliding track arm

Ω​ Fixed closing power size 3, suitable for internal door weight 40-65kg

Ω Opening angle limit: 150 degree, usually set opening angle at 90º

Ω No need to close manually, the closer itself will close automatically

Ω Hold open unit in track rail is for optional, which can be easily installed

► Trusted cooperative manufacturer of world's well-known door security brands

Painting - Aluminum, Gold, Bronze, Brown, White, Black

* SPRING THRUST, EASY BACK: commercial-level swing arm won’t interfere with opening,

at the same time closing door gradually to allow elegant entrance and exit

* SOFT, NO MANUAL CLOSING : let the door close by itself, enjoy automatic closing and

latching, maintaining quiet and security.

           ------------ Our Advantages ------------

                     1.   Only produce door closer, annual output 1.5-2.0mils pcs.

                     2.   UL & CE certification, max. Life cycle test of 5 mil. Cycles.

                     3.   Pass European & China ISO9001:2015 QMS Certification.

                     4.   Mainly for export market since foundation in October, 2011.

                     5.   Long term cooperative supplier of world’s top security brands.

A High-end Germany Gating Hardware Brand

Originally founded in 1872, Dorrenhaus is a high-end Germany gating hardware brand. At the beginning of 1980's,

Dorrenhaus entered into Chinese market, and supplied numerous households in China with high quality hardware products.

On October 10, 2011, Dorrenhaus's door closer manufacturing base in China - Zhejiang Dorrenhaus Hardware Industry Co.

Ltd was formally founded. All members of management team have more than 15 years of experience in door closer industry.

Marketing Under Dorrenhaus and DORHAUS Brand

In 2017, our new trademark - DORHAUS was registered. We have $3 million registered capital. Our main products include

hydraulic door closers, automatic door closers, concealed door closers, commercial door closers, fire door closers, auto door

closers, sliding door closers, heavy duty door closers, overhead door closers, UL-listed door closers and door closer parts.

We have 205 total number of employees, which includes seven R&D staff and 13 quality control staff in our

15,000-square-meter factory.

Exporting Products Worldwide

Now, we have six complete production lines with annual output of 1.5 to 2.0 million sets. We export our products to more than

20 countries in North America, Europe, Russia, the Middle East and Southeast Asia. We passed the certification for EN ISO

9001:2008 quality management system in 2014, and ISO9001:2015 in 2017 respectively.

Our products passed many international and domestic certification and standard, such as:

American National Standard: ANSI 156.4 Grade 1, life cycle test of 2mil cycles

American UL228 and UL 10C for 3 hours fire testing

European Standard CE: EN1154, life cycle test of 500,000 cycles

European Standard CE: EN1634 fire testing

China National Standard: QB/T 2698-2005 Grade 1, life cycle test of 1 mil. cycles

China Compulsory Product Certification for fire rated door closer

Cooperate with Us Today

For more detailed information regarding our business, contact us today.