DRIWON DN-9500 Grade 1 – a commercial entrance door closer for office towers and corporate campuses: lobbies, tenant corridors, stairwells and emergency exits. Smooth, reliable operation under constant daily use.
Built for office towers and corporate campuses across the U.S.
Main entrances, lobbies & corridors
Tested beyond 2 million cycles
Smooth closing for office traffic
On rated door assemblies
An office building has very different doors under one roof: heavy glass or metal lobby entrances, lighter tenant suite doors, and fire-rated stair and corridor doors. A single Grade 1 adjustable closer simplifies purchasing: size 1–6 power lets you set each door correctly.
In high-rise buildings, temperature differences between inside and outside create a stack effect that pushes air through lobbies and stairwells. This can make doors hard to close or hard to open. Use an adjustable closer, set the latch speed so the door fully latches, and then verify opening force.
Under the 2010 ADA Standards for Accessible Design (section 404), interior hinged doors must open with no more than 5 lbf, and a closer must be adjusted so the door takes at least 5 seconds to swing from 90° to 12° from the latch. Fire doors are the exception on opening force: the authority having jurisdiction sets the minimum. Always check local code and your AHJ.
Stair and corridor fire doors must self-close and latch (NFPA 80, NFPA 101). The DN-9500 is UL listed and 3-hour fire rated when used on a rated assembly.
Managing a portfolio? Ask us for volume pricing.
Suite entry doors are the most-used doors in a multi-tenant office building. Whether they must be self-closing depends on whether the corridor is rated, which varies with occupancy, sprinklers and the code edition, so check with the building official. Even where not required, closers keep suites secure and quiet. Landlords often specify one closer model in tenant design criteria; the DN-9500 suits busy entries and the aluminum DN-8220 suits interior suite doors.
Office towers rely on stairwell doors that close and latch against stack effect and stair pressurization, on server rooms and IT closets that must stay closed for security and fire suppression (see data center and server room door closers), and on mechanical, electrical and loading dock doors that take heavy use. Garages under office buildings add pressurized lobby doors; see underground parking garages.
| Model | DRIWON DN-9500 extra heavy duty commercial door closer |
|---|---|
| Certification | ANSI/BHMA A156.4 Grade 1; UL listed |
| Fire rating | 3-hour fire rated when installed on a rated door assembly |
| Power size | Adjustable 1–6 |
| Door weight | 44–440 lbs (20–200 kg) |
| Door width | 23"–59" (58–150 cm) |
| Body / arm | Extra heavy duty cast iron body, wrought steel arm, heat-treated piston |
| Control | Hydraulic, with delayed action and secure positive latch |
| Finish | Corrosion-resistant powder coat, silver or black |
Need the lighter-duty option for interior doors? See the DRIWON DN-8220 Grade 1 door closer. Full details on the DN-9500 product page.
A Grade 1 heavy duty hydraulic closer with adjustable size 1–6, like the DRIWON DN-9500, tuned for the door's weight and wind exposure.
Stack effect and pressure differences can resist the door. Adjust the latch speed and power size, and confirm opening force.
Yes, on rated assemblies. It is UL listed and 3-hour fire rated.
Yes. Use the form below.
If the corridor is fire rated, yes. Otherwise it depends on local code and landlord standards; many buildings use closers for security and noise control anyway.
The aluminum DN-8220 is a versatile Grade 1 choice for interior suite doors; use the cast iron DN-9500 for lobbies, stairs and service doors.
Usually yes, for access control, fire separation and clean agent suppression. See our data center page.
Need multiple DN-9500 units for office buildings, corporate lobbies, or commercial entrance projects? Contact our team for volume pricing, specifications, and fast supply.
