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Hager 740SAN Automatic Door Bottom | Alum Finish with Neoprene Insert
The Hager 740SAN is a professional-grade automatic door bottom designed to provide an airtight, high-performance seal against drafts, light, smoke, and sound. This surface-mounted unit features a sophisticated internal mechanism that automatically drops a high-quality neoprene gasket when the door is closed and retracts it instantly upon opening. This prevents "door drag" and ensures a long-lasting, heavy-duty seal for commercial and residential openings.
Advanced Environmental and Fire Protection
The Hager 740SAN is built for extreme durability and code compliance. The Neoprene insert is engineered to remain flexible in temperatures as low as -50°F, making it the premier choice for cold-storage facilities or harsh winter climates. Furthermore, this door bottom is UL Classified as a Category J gasket, making it suitable for use on fire-rated hollow metal doors (up to 3 hours) and wood core fire doors (up to 20 minutes).
Precision Installation and Surface Mounting
Designed for the push side of the door, the 740SAN is a standard duty aluminum housing with a clean mill finish. It is furnished as an exact length but can be field-trimmed up to 2 inches for a custom fit. For maximum effectiveness, this unit should be used in conjunction with a flat threshold or floor surface to ensure the gasket creates a complete seal across the entire width of the opening.
Technical Specifications
| Feature | Specification |
| Model Number | Hager 740SAN |
| Mounting Type | Surface Mounted (Push Side) |
| Housing Material | Mill Finish Aluminum |
| Insert Material | High-Flexibility Neoprene |
| Temperature Rating | Flexible to -50°F (-49°C) |
| Fire Rating | UL10C Classified (Category J) |
| Sound/Smoke Rating | Rated for Air, Smoke, and Sound Control |
| Trimming | 2" Maximum field trim |
| Fasteners | #8 x 1-1/4" Pan head screws, covers, and strike plates included |
Critical Installation Notes
- Floor Surface: Automatic door bottoms require a flat floor or threshold for a proper seal.
- Operation: The gasket remains in contact with the floor for the first 3 inches of the door's swing.
- Obstructions: Avoid use with carpet reducing strips, as these can catch and pull the neoprene insert out of the aluminum housing.
- Compatibility: For best results, use in conjunction with cam lift hinges or high-quality commercial thresholds.
| Length | 36 Inch or 42 Inch or 48 Inch |
| Brand | Hager |
| Insert Material | Neoprene |
| Fire Rated | Fire Rated |
| Mounting Type | Surface Mounted |
| Bottom Weatherseal Type | Automatic Door Bottom |
| Housing Finish | Aluminum |
| Sweeps, Door Bottom or Rain Drip | Door Bottom |
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