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Pemko #411NBL Automatic Door Bottom, Mortised with Nylon Brush Seal, .75" Drop

Pemko #411NBL Automatic Door Bottom, Mortised with Nylon Brush Seal, .75" Drop
Product Specs of Pemko 411ANBL Automatic Door Bottom Mortised Automatic Door Bottom with Nylon Brush Seal Mortised Automatic Door Bottom with Nylon Brush Seal Applied to Wooden Door Mortised Automatic Door Bottom with Nylon Brush Seal Applied to Wooden Door

This Automatic Door Bottom uses a nylon brush seal to fill gaps up to 3/4". It is fully mortised and designed to be applied to wooden doors. Narrow casing is compatible with 1-3/8" or 1-3/4" thick doors. Available in aluminum mill finish and is custom cut to size.


To determine sizing, see How to Measure for an Automatic Door Bottom. Note, door bottom can be further trimmed up to 2".

Market price: $48.00
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Price: $38.40
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Options 1-3/4" or 1-3/8" Door Thickness
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This Automatic Door Bottom is fitted with a nylon brush seal to seal the gap under doors from sound, fire, smoke, dusts and drafts. It is fully mortised which is great for aesthetics and for luxury and designer doors.

Dimensions: The mechanism of the door bottom is encased in a 1-3/8" (H) x 9/16" (W) casing. Length is custom cut to size. To determine sizing, see How to Measure for an Automatic Door Bottom

Door Compatibility: Designed to be applied to wood doors. Model is compatible with both 1-3/4" and 1-3/8" thick doors. However, different end plates are required for each door. Please select from options above.

Available Finishes: Aluminum Mill Finish

Seal: The nylon filaments conform well to irregular surfaces such as carpets, stone and grout lines. An aluminum stop is lowered along with the brush to prevent the brush from being pushed back too far and lengthens the life of the seal.

Compliance Details: Green Guard Gold Compliant; Air Infilatration, Smoke and Fire Rated; BHMA Certified; Complies with ANSI R3A324, R3A325. See Product Data tab for more information.

InstallationInstallation instructions, end plates and screws provided.   

Please note, images are for illustrative purposes only. They are not actual photos. Therefore, actual colors may vary slightly and size may be enlarged to show detail. See product specs for exact measurements.

This product is guaranteed for 5 years against defects in material and workmanship.
Click here to view our full Warranty Policy.

Products can also be purchased with rubber seal, see our Automatic Door Bottom, Narrow Casing with Rubber Seals.

Product Data

How it Works: Automatic Door Bottoms utilize a concealed flat spring mechanism and plunger. When the door is closed, a brass plunger is compressed to automatically lower the seal, starting from the hinge side first. This motion ensures a smooth usage even on an uneven surface and prevents drag. The seal is automatically raised upon opening.

See also About Automatic Door Bottoms.

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Click here for a Printable Copy of How to Install a Mortised Automatic Door Bottom.

Automatic Door Bottoms are available with three mounting options: Surface Mounted, Semi-Mortised and Fully Mortised. A surface mounted application can be applied without removing the door from its hinges. For a semi-mortised, if the rabbet in the door is cut-out already, the door does not need to be removed. For a fully mortised application the door should be removed before starting. 


How to Install a Mortised Automatic Door Bottom - Preparing Your Door Bottom

Remove door and cut mortise in bottom of door as per the dimensions of the provided product specs.

NOTE: If a door is fire labeled or of special construction, mortise preparation must be done by the door manufacturer.


How to Install a Mortised Automatic Door Bottom - Measure Your Door

Measure your door from side to side. That will determine the length required for your Door Bottom.

How to Install a Mortised Automatic Door Bottom - Trim Your Door Bottom

Once you have you determine the size needed, if necessary, trim your door bottom. Use a chop saw or table saw to create a perfectly straight cut.

Note, Only trim opposite the actuating plunger, brass nut. (Trimming from the brass nut side will ruin your ADB). You can trim from the edge up to one inch of the screw on the side wall of the ADB.



How to Install a Mortised Automatic Door Bottom - Apply Your Automatic Door Bottom

With door removed from opening, install the door bottom with plunger at the hinge side, fasten with screws provided and install door in opening.


How to Install a Mortised Automatic Door Bottom - Adjust Your Automatic Door Bottom

Screw the actuating plunger in or out as required until the gasketing just touches the sealing surface when the door is closed.

It is not necessary to squash the gasket to provide an effective seal.

Once you have followed through with all the instructions your Automatic Door Bottom is good to go! Enjoy years of quality sound, draft and light infiltration control with your new door bottom.


Compliance Details

Click to View Ratings Explained


  Eco-V Vinyl Seal complies with UL Green Guard Gold Gold




Finishes Comply ANSI/BHMA Codes: US27 / 719

Door Bottom Complies with ANSI R3A324, R3A325

Shipping / Returns
  • Ship Time:
    • This product is custom made to your specifications, please allow 10-14 Business Day to ship.
    • Ships via major carriers, such as UPS or FedEx Ground, with tracking information provided.
  • Domestic Shipping Fees- (Hawaii and Alaska not Included):
    • FREE SHIPPING on orders over $200.00 (excludes oversized and freight orders).
    • There will be a flat $19.99 shipping and handling fee on orders under $200.00.
    • Oversized Items: Items 86" and above have an oversize surcharge of $70.00
    • Freight Orders: Items 95" and above require freight shipment and have a shipping charge of $150.00
    • Orders totals above $1,500.00 will ship free, regardless of size.
  • Alaska and Hawaii, Canada, and International Shipping:
  • Returns:
    • This product is custom made and is not returnable.
    • We are commited to your satisfaction, as a courtesy, we may, at our discretion accept returns with a minimum 25% restock fee.
    • Weatherstripping products will not be considered for returns.
    • Item must be in new, resaleable condition.
    • Please call or email us to receive an RMA number before returning. No returns will be processed without an RMA number.
    • Return shipping is customer's responsibility. A return address will be provided with RMA#.
    • If you are shipping via USPS (not recommended) do NOT require signature as we will not be able to pick up your package from local post office facility.
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