Adams Rite - 8420-27248 - Narrow Stile - Mortise Exit Device - Dark Bronze Anodized Aluminum - 31/32" Backset - RHR - 48" - Grade 1
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The Adams Rite 8420-27248 Narrow Stile Mortise Exit Device is a Grade 1 Life-Safety narrow stile mortise exit device designed specifically for aluminum framed doors requiring a reliable egress solution. Finished in dark bronze anodized aluminum, this model is built for durability, performance, and compliance with safety standards. Its 48-inch push bar is suited for applications with narrow stile doors and is engineered for ease of installation and maintenance. The device is right-hand reverse (RHR) handing with a 31/32-inch backset, making it appropriate for many retrofit and new installations in commercial settings. The internal mechanism features Adams Rite’s patented “Starwheel” bolt interlock, ensuring that when the door is closed, the bolt and strike interlock securely to resist forced entry until the pushbar is depressed to allow exit.
| Parameter | Value |
|---|---|
| Model / Part Number | ADD-8420-27248 |
| Series | Adams Rite 8400 Series (narrow stile mortise) |
| Function | Life Safety / Panic Egress (exit device) |
| Grade | Grade 1, ANSI/BHMA A156.3 |
| Handing | RHR (Right Hand Reverse) — field reversible |
| Backset | 31/32 in. (24.6 mm) |
| Push Bar Length | 48 in. (field-cuttable) |
| Finish | Dark Bronze Anodized Aluminum (Finish code 313) |
| Base Material | Extruded aluminum (anodized) |
| Door Thickness Compatibility | Standard 1-3/4 in.; up to 2-1/4 in. with thick door kit |
| Minimum Stile Width | Approximately 2 in. (fits narrow stile aluminum doors) |
| Projection | ~2-5/8 in. projected; ~1-5/8 in. when dogged |
| Dogging | Hex key dogging standard; optional cylinder or electric dogging available |
| Cylinders / Trim | Accepts standard mortise cylinders with MS cam (typical 1 in. length) |
| Strikes / Accessories | Standard strike included; optional extended strikes and door kits available |
| UL / Listings | UL 305 Panic Hardware listing (verify variant for fire-rating) |
| Warranty | 5-year limited warranty |