This kind of automatic door bottoms is designed to be fully mortised into hollow metal doors. A heavy duty, Mortised Type. First, the door bottom processing a groove (slotted size) , and then the automatic door bottom sealing strip embedded in the groove, with the package attached to the fixed tab fixed.
| Material | Aluminum alloy frame + silicone sealing strip + 304 stainless steel accessories |
|---|---|
| Seal Material | Silicon rubber or EDDM seal |
| Location | Door bottom or sliding door edge |
| Finishes | Aluminum, Dark Bronze Anodized, custom powder coated finishes upon request |
| Standard Lengths | 800mm, 915mm, 1000mm. Can be cut according to customer request |
| Mounting Type | Surface Mounted Type |
| Min/Max Gap Size | 3mm / 15mm |
ADB-012 is designed to be fully mortised into hollow metal doors. A heavy duty, mortised, automatic ‘flat back’ drop seal to suit installation to metal door rails.
It features a high efficiency mechanism, which lifts the seal clear of the floor as soon as the door is opened by a few millimetres; resulting in lower door operating forces.
Requires no power connection. Self-levelling on uneven floors; seal height can be adjusted independently of fixing screws.
Housing Material: Made of 6063 aluminum alloy; fasteners are made of stainless steel sheets and screws.
Seal Strip: Equipped with standard silicone rubber sealing strip.
Round Actuator Head: Comes standard with a round metal plunger.
Custom Lengths: Available in customizable lengths from 250mm to 1500mm.
Standard Lengths: 800mm, 915mm, and 1000mm.
Installed inside a mortised groove at the bottom of the door, this type remains invisible from outside — providing a sleek and elegant appearance.
When the door closes, the seal drops automatically to fill the gap. Upon opening, the seal retracts — ensuring smooth operation without floor friction.
Effectively blocks air, dust, sound, smoke, and insects, improving insulation and comfort for interior spaces.
Perfect for hotels, hospitals, offices, conference rooms, and other places requiring both functionality and aesthetics.
Works with wooden, steel, composite, and acoustic doors — highly versatile across industries.
At DAOSEAL, we offer flexible OEM and customization options to match your specific needs.
DAOSEAL maintains strict quality control across every step of the manufacturing process. From material selection to final inspection, we ensure every automatic door bottom meets our highest standards.
Discover what our customers say about DAOSEAL’s s Automatic door bottom. From product performance to support experience, we’re proud to be their sealing solution partner.
We are manufacturer base in China, Real factory no middleman
A: An automatic door bottom is a sealing device installed on the bottom edge of a door. When the door closes, an internal mechanism lowers the seal to block air, sound, dust, smoke, and light from passing through the gap under the door.
A: Our models are compatible with wood, metal, glass, and acoustic doors. They can be surface-mounted or mortised depending on the door structure and installation needs.
A: Yes. We support full customization including lengths (up to 1000mm+), activation mechanisms (single plunger, double plunger), and sealing types (neoprene, silicone, brush insert).
A:Yes, we offer models designed for fire-rated doors and acoustic sealing applications. Let us know your project requirements and we’ll recommend the most suitable model.
A: Yes, each product comes with the required mounting accessories and installation guide for fast and easy setup.
A: Our standard MOQ is 200 pcs per model. For custom specifications or OEM requests, please contact us for a detailed quote.
Contact Daoseal for expert advice, fast quotation, and free sample of door & window sealing strips. Response within 12 hours, guaranteed!
We will contact you within 1 working day, please pay attention to the email with the suffix “@Daoseal.com”.
