📊 DRIWON DN-9500 — Adjustable Size 1 Through 6
One closer covers doors from 44 lbs to 440 lbs and 23" to 59" wide. Grade 1 · Free Amazon delivery.
What "Size" Actually Means
The size number of a door closer refers to the spring strength — the force the spring applies to close the door. A size 1 closer has the lightest spring; a size 6 has the heaviest. The ANSI/BHMA standard defines the minimum spring force for each size, ensuring consistency across manufacturers.
The practical relationship is straightforward: a heavier, wider door requires a stronger spring to close and latch reliably. Undersizing creates a closer that cannot fully close the door against normal air pressure or door seals. Oversizing creates a door that opens with excessive force — both an accessibility problem and a comfort issue.
💡 Adjustable vs fixed size: Many commercial closers — including the DRIWON DN-9500 — are "adjustable" across a size range (e.g., size 1–6). This means a single unit can be tuned within that range by adjusting the spring tension screw. An adjustable 1–6 closer is the most flexible specification, covering virtually all standard commercial door weights and widths with one SKU.
Door Closer Size Chart
| Size | Typical Door Width | Typical Door Weight | Common Applications |
|---|---|---|---|
| 1 | 23" – 30" | 44 – 65 lbs | Interior light-duty, office doors, restroom stall entries |
| 2 | 28" – 34" | 60 – 90 lbs | Interior commercial doors, office suites, light corridor doors |
| 3 | 32" – 40" | 85 – 130 lbs | Standard 36" interior commercial doors, classroom doors, hotel rooms ⭐ Most common |
| 4 | 36" – 48" | 120 – 200 lbs | Standard exterior commercial, hospital corridor, school entrances ⭐ High-traffic standard |
| 5 | 42" – 54" | 175 – 300 lbs | Heavy exterior doors, wide commercial glass, loading dock access |
| 6 | 48" – 59" | 250 – 440 lbs | Maximum-weight doors, heavy hollow metal, wide factory/warehouse doors |
⭐ Highlighted rows are the most common specifications for standard commercial openings. Door weight estimates assume standard hollow metal or aluminum-framed glass construction; solid wood or steel plate doors will weigh more.
When to Size Up
Always size up — not down — when a door falls between two size ranges, or when any of these factors apply:
- Parallel arm mounting: Parallel arm provides less mechanical leverage than regular arm. Size up by one level (e.g., size 4 → size 5) when using PA mounting on heavy doors.
- Exterior exposure / wind: Doors exposed to prevailing wind need a stronger spring to overcome wind pressure on closing. Size up one level for exposed exterior doors in windy climates.
- Door with weatherstripping or seals: Heavy door seals add significant closing resistance. Add one size to overcome seal compression resistance at latch.
- Very wide door: Width increases the lever arm the closer must work against. At the upper end of a size's width range, size up for reliable latching.
The DRIWON DN-9500: Adjustable Size 1–6
The DN-9500 covers the full commercial size range — from size 1 (lightest interior doors) to size 6 (heaviest commercial slabs, up to 440 lbs and 59" wide). This means facilities managers and contractors can stock a single model and tune it to any opening on a property, rather than stocking separate size-3, size-4, and size-5 units.
The spring tension is adjusted via a screw on the end cap of the closer body — a process that takes less than a minute with a standard screwdriver. The hydraulic valves (sweep, latch, backcheck, delayed action) are adjusted separately and independently, giving full control over both closing force and closing speed.
📦 One Closer for the Entire Property
DN-9500 adjustable size 1–6 covers every commercial opening. Grade 1 · 3-hr fire rated · Ships free.
Door Closers That Cover Sizes 1–6
Door Closer Size FAQ
What size door closer do I need for a 36-inch door?
Most 36" interior commercial doors use size 3. Exterior, heavy or parallel arm installations often need size 4 or more.
What happens if a door closer is too big?
The door becomes hard to open, which can break ADA limits and annoy users. Adjustable closers let you reduce the spring power.
What happens if a door closer is too small?
The door may not close fully or latch against seals, drafts or wind, which is a fire code problem on rated doors.
What closer handles very heavy doors?
The DRIWON DN-9500 adjusts to size 6 for doors up to 440 lbs and 59" wide, such as heavy church, factory and stair doors.
Is one adjustable closer enough for a whole building?
Usually yes. An adjustable size 1–6 closer covers most commercial openings, which simplifies purchasing and spare parts.