Fire Rated Door Drop Down Seal Concealed Automatic Door Bottom Seal

“Sincerity, Innovation, Rigorousness, and Efficiency” would be the persistent conception of our enterprise with the long-term to build with each other with consumers for mutual reciprocity and mutual advantage for Fire Rated Door Drop Down Seal Concealed Automatic Door Bottom Seal, To achieve reciprocal advantages, our business is widely boosting our tactics of globalization in terms of communication with overseas clients, rapidly delivery, the top excellent and long-term cooperation.
“Sincerity, Innovation, Rigorousness, and Efficiency” would be the persistent conception of our enterprise with the long-term to build with each other with consumers for mutual reciprocity and mutual advantage for , Our company insists on the purpose of “takes service priority for standard, quality guarantee for the brand, do business in good faith, to deliver qualified, rapid, accurate and timely service for you”. We welcome old and new customers to negotiate with us. We’ll serve you with all sincerity!

Product Description

GF-B03FR

GF-B03FR Consealed fire door drop down seal, M-type spring structure, suitable for doors with slots in the door leaf. During installation, there is a 34mm*14mm through slot at the bottom of the door. Place the product in it, fix it from the wing of the product, and install the decorative end cover with screws. The use of this product does not affect the overall style of the door.

When a fire occurs, the fireproof expansion seals on the wings installed on both sides will expand rapidly to block the gap at the bottom of the door, prevent the spread of flames, cut off harmful gases, fight for escape and rescue time, and provide a guarantee for the safety of life. In normal conditions, it can be used for sealing functions such as temperature insulation, sound insulation, and dust blocking.

Product Advantage
✓Consealed type, easily install with end cover plate or both bottom wings.
✓Unique design, M type spring with reinforced nylon structure, stable performance.
✓Nylon or copper plunger is available depending on the whole style of the door.
✓Silicone rubber sealing , high temperature resistance, aging resistance.
✓Intumescent fire strips are added on the bottom wings of both sides of B03, which can be used for fire door installation.
Specifications

Packaging method

FAQ

Q1: Where can the door seal be used?
A1: The drop down door seal is suitable for residential, commercial, and industrial doors.

Q2: When should I consider replacing the door seal?
A2: With a tested operational life of up to 100,000 cycles, replacement is only necessary when the seal shows signs of wear or damage, or when its effectiveness diminishes over time.

Q3: How does using this seal benefit my property or business?
A3: By installing the door seal, you can reduce drafts, noise, and dust infiltration, improving energy efficiency and comfort within your space while minimizing maintenance needs.

Q4. Are you a manufacturer or trading company?
A4:We are a professional door and windows seal manufacturer with more than 23 years ‘experience for domestic and International market.

Q5. Do you offer free samples?
A5: Free samples are available .

Q6. Do you offer OEM service and can you product as our drawings?
A6: Yes, we can customize according to your drawing , or make drawing according to sample as your requirement.

Q7. Do you accept our design on boxes?
A7: Yes. We accept.

Q8. What’s your delivery time?
A8: Generally, we will arrange shipment within 7-30 days after receiving the deposit and according to your purchasing quantities .

Q9. How do you control the quality?
A9: We will arrange sample confirmation before production if you need . During the production, we have professional QC staffs control the quality and manufacture in accordance to your confirmed samples. Welcome your visit to factory.

The Fire-Rated Concealed Automatic Drop-Down Door Bottom Seal, also known as a fire-rated automatic retracting door bottom seal or concealed door bottom automatic sealer, is specifically engineered for fire-rated doors, steel doors, wooden doors, and other high-performance door assemblies. Its concealed installation design allows the seal to be recessed into a pre-cut groove at the bottom of the door leaf, preserving a clean appearance without compromising the door’s overall aesthetics. When the door closes, an internal automatic drop-down mechanism is activated by the door frame or floor trigger, causing the sealing strip to extend downward and press tightly against the floor, creating a continuous and stable sealing barrier. When the door opens, the seal automatically retracts and remains concealed within the door bottom, preventing friction with the floor, extending service life, and ensuring smoother door operation.

This product integrates fire resistance, smoke sealing, sound insulation, dust prevention, draught exclusion, insect protection, and thermal insulation in one solution. It effectively blocks the passage of smoke, flames, noise, dust, and hot or cold air through the door gap, improving fire compartment integrity and indoor environmental comfort. The sealing strip can be made from intumescent fire-resistant materials, silicone, EPDM rubber, or wear-resistant composite materials, paired with an aluminum alloy or stainless steel housing for high-temperature resistance, wear resistance, and aging resistance. It is suitable for high-frequency applications. An optional intumescent strip is available; when exposed to fire or high temperature, it expands rapidly to seal the door bottom gap, helping to protect evacuation and firefighting operations.

The concealed automatic door bottom seal is installed at the bottom of the door and requires no additional space. It is particularly suitable for hotels, hospitals, schools, office buildings, shopping malls, server rooms, laboratories, cleanrooms, and industrial plants where fire protection, sound insulation, and cleanliness are required. Installation simply involves grooving the bottom of the door leaf, embedding and securing the seal, and adjusting the trigger position. The product features a compact structure, stable operation, low noise, and easy maintenance. Different specifications and trigger types—such as mechanical trigger and side-pressure trigger—can be selected according to door width, door weight, floor material, and fire rating. Custom lengths, colors, surface finishes, and accessories are available.

In terms of product details, the housing is anodized or powder-coated for corrosion resistance; the sealing gasket is soft, wear-resistant, and highly resilient; the lifting mechanism is tested for repeated fatigue cycles and ensures sensitive operation; end caps are available in plastic or metal; and mounting holes are precisely positioned. For daily maintenance, simply clean dust from the groove, inspect the trigger component and gasket for wear, and replace the gasket when necessary. Choosing a fire-rated drop-down door bottom seal not only meets the sealing requirements of fire-rated doors but also significantly improves sound insulation, smoke control, and energy efficiency. It is an indispensable functional component in modern building door and window systems. Combining safety, quiet operation, aesthetics, and durability, it provides a reliable door bottom sealing solution for hospitals, office buildings, hotels, and other demanding environments.