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Pemko 4301CRL Surface or Semi-Mortised Automatic Door Bottom | Sponge Neoprene EPDM Seal
The Pemko 4301CRL Automatic Door Bottom is a heavy-duty, versatile solution engineered for high-performance environmental control. Featuring a sleek Clear Anodized Aluminum finish, this architectural-grade unit offers the unique flexibility of being either surface-mounted or semi-mortised. This makes it an ideal choice for retrofitting existing commercial doors or for use in new construction where a robust barrier against air, light, sound, and smoke is required.
Equipped with a resilient Sponge Neoprene EPDM seal, the 4301 Series excels in durability and sealing capability. The specialized drop-down mechanism is actuated by a jamb-contacting plunger, ensuring the seal only engages when the door is fully closed. This hinge-side actuation is critical for preventing "seal skidding" and door hang-up, protecting your flooring and ensuring effortless door operation.
Key Features & Performance
- Dual-Mount Application: Can be installed as a full surface unit on the face of the door or as a semi-mortise application for a lower-profile appearance.
- Sponge Neoprene EPDM Seal: A slightly compressible, high-grade rubber that provides an airtight and watertight barrier, remaining flexible even in extreme temperatures.
- Positive Seal Mechanism: Features a "smoother action" drop-bar that effectively fills the gap under the door, blocking out drafts, dust, moisture, and insects.
- Non-Handed Versatility: The symmetrical design allows for fast, universal installation on both left and right-hand doors without complex disassembly.
- Field Trimmable: Provided at NET length and can be trimmed by up to 2" in the field for a precise, custom fit to your specific door width.
Technical Details & Certifications
- Base Material: High-strength Aluminum with Clear Anodized finish.
- Dimensions: 29/32" Width x 1 25/32" Overall Height.
- Fasteners: Includes thru bolts and heavy-duty #10 x 2" THSMS (shorter screws provided for semi-mortise applications upon request).
- UL 10C Fire Rated: Certified for Positive Pressure Fire Tests, making it a safety-essential component for fire-rated door assemblies.
- UL 1784 Smoke Inspected: Meets rigorous air leakage standards for smoke-protective openings in hospitals, schools, and hotels.
- Acoustic Rating: Tested to ASTM E 90-2009 to ensure significant reduction in sound transmission.
- Environmental Safety: GREENGUARD Gold Certified for low chemical emissions, supporting healthier indoor air quality.
- Standard Compliance: Meets ANSI/BHMA A156.22 and ASTM E-283-04 for architectural gasketing systems.
| Length | 36 Inch or 42 Inch or 48 Inch |
| Brand | Pemko |
| 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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