UL Listed Overhead Concealed Automatic Door Closer D30 Slide Back Sliding

• Skilled Craft : even operation, oil tight, noiseless
• UL 228 Certificate, 200,000 plus tested life cycles
• Closing force of size 3, suit for door width 950mm

Dorhaus concealed door closer D30, is of overhead and hydraulic type,
are mounted within the door and are hidden while the door is closed.
It' is difficult to be installed than surface mounted units. Normally it's
for project especially for hotel or restaurant.

Ω Light duty overhead concealed automatic door closer for internal door
Ω Latching / closing speed adjustable by dual separate regulating valves
Ω Universal application, non-handed installation for standard mounting
Ω Casting aluminum closer body and hidden slide back sliding arm
Ω Slim body with 32mm thickness, min. thickness 45mm for wooden door
Ω Max. door opening angle: 150 degree, normally set at 90º open angle
Ω Comply with standard for UL 10C Certification with 3 Hours Fire Rated
Ω Conform to requirement of UL 228 Certification, 200,000 plus life cycles
Ω Fixed closing power size 3, for max 950mm width or 65kg indoor door

► Long-term cooperative vendors of international well-known security companies


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

* SPRING FORWARD, EASY BACK: the commercial-grade arm won’t interfere with opening,
while closing doors slowly enough to allow graceful entrance and exit
* GENTLE, NO MANUAL CLOSING required: allow the door do the work, enjoy self-acting
closing and locking, keep quiet and safety.

           ------------ 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.