Home > Door Seals > Automatic Door Bottoms > Mortised > Zero #364, Automatic Door Bottom, Mortised, Heavy Duty with Neoprene Bulb Seal, 1" Drop

Zero #364, Automatic Door Bottom, Mortised, Heavy Duty with Neoprene Bulb Seal, 1" Drop

Zero #364, Automatic Door Bottom, Mortised, Heavy Duty with Neoprene Bulb Seal, 1" Drop
Product Specs of Automatic Door Bottom 364 Fully Mortised Clear Anodized Automatic Door Bottom 364 Fully Mortised Automatic Door Bottom 364 Applied on Wooden Interior Door in Open Position Fully Mortised Automatic Door Bottom 364 Applied on Wooden Interior Door in Closed Position

This Zero International #364, Fully Mortised, Heavy Duty Automatic Door Bottom will block sound, light and drafts by creating a strong seal at the bottom of your door. Fitted with a solid neoprene bulb seal and high quality mechanism that has been successfully tested through 5 million cycles! Rated for smoke and fire and length is custom cut to size.

How to Order: Selecting Exact Size will determine your total price. Note, this product is priced per range with 18-1/4"-36" being the lowest priced range. To determine size required, see How to Measure for an Automatic Door Bottom.

Stock sizes - 32", 36" and 48" long are available to ship within 1 business day. Click here for our Quick Ship TMH Mortised, Heavy Duty Automatic Door Bottom.

Price: $82.59
Size Range
Exact Length
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SKU Z364AA|36
Shipping See Shipping Tab Below

The fully mortised aspect of this automatic door bottom is great for high end designer doors and luxury hotels and condo units that prefer their doors retain their clean, unobtrusive look.

Dimensions:  Body measures 1.575" H x .924" W. Extended flanges on both sides measure .371". Total Width is 1.6". Compatible with doors with a thickness of at least 1.75".

Suggested Door Cut-out: 1" x 1-5/8"

Finishes:  Clear Anodized Aluminum - Anodized to 204

Seal: High quality solid neoprene bulb with a maximum effective drop of 1". Interior is rubber filled for added protection.

Compliance Details:  Sound, fire and smoke rated (see product data tab for more details)

Handing:  Compatible with right and left handed doors.

Installation:  Installation instructions and screws provided.

Sizing:  To determine sizing, see How To Measure For An Automatic Door Bottom.

Additional Option - Light Spring Strength: Light Spring Strength requires less operating force to activate than standard Strength. Light Spring is compatible with ADA Compliant Doors and can be easily used by those with limited mobility. Can also be applied to sliding doors. Casing dimensions remain the same. To purchase, please contact us at 845-388-1300.

Additional Option - End Caps: This product comes with standard end caps. Easy Access End Cap brackets can be ordered by selecting link. Easy Access Brackets are designed to secure Mortised Automatic Door Bottoms to the door without using bottom screws, enabling easy access for repairs and maintenance and for the unit to be removed without taking the door off the frame. Hospitals and health care centers may need to remove the rubber insert for cleaning purposes.

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

This product has a 1 year guarantee against defects in material and workmanship.
Click here to view our full Warranty Policy

For even higher sound control, see our Zero International #369 Automatic Door Bottom, High Sound Mortised

How It Works

The Automatic Door Bottom utilizes a concealed flat spring mechanism which is activated upon opening and closing of the door. A brass plunger is compressed when the door is closed to automatically drop the seal, starting from the hinge side first. The seal is raised when the door opens. This motion ensures a smooth drop without a drag, even on an uneven surface. It is compatible with a door saddle or against the floor. The door bottom is built from durable materials that are meant to last. It has been tested through 5 million cycles!

See also About Automatic Door Bottoms.

Product Specs
Compliance Details

compliance details for z364

Installation Guide

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.


Shipping / Returns
  • Ship Time:
    • This product is custom made to your specifications, please allow 2-3 weeks to ship
    • *Similar or equivalent products from other manufacturers may be available to ship sooner. For expedited processing please contact our customer service department.
    • EXCEPTIONS: Gold Anodized Aluminum and Black Anodized Aluminum Products require 2-6 week processing time.
    • 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 30% 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.
Product reviews are only available to verified buyers of this product. To leave a review, please refer to the product review email we sent you.
  • Easy To Use (1)
  • Poor Design (1)
best uses
  • Big Jobs (1)
  • Inside (1)
  • Small Jobs (1)

Reviewed by 2 customers

Displaying reviews 1-2

By Disappointed property manager

from Davis , Ca

About Me Professional

Verified buyer
  • Poor Design
best uses
Comments about Zero #364, Automatic Door Bottom, Mortised, Heavy Duty with Neoprene Bulb Seal, 1" Drop:
We waited weeks for delivery because the company kept telling us it had shipped when it had not. After a cumbersome and time consuming installation, the sweep only fully deploys intermittently. Typically 50% drops into place as expected . We are very disappointed and still in need of a smooth reliable and well functioning sweep.

By Dan

from Santa Fe , New Mexico

About Me Avid Do-It-Yourselfer

Verified buyer
Very cool
  • Easy To Use
best uses
  • Big Jobs
  • Inside
  • Small Jobs
Comments about Zero #364, Automatic Door Bottom, Mortised, Heavy Duty with Neoprene Bulb Seal, 1" Drop:
This is a pretty cool product . It was easy to install. It took me about 3 hours to complete , most of that time was making the mortise pocket. Now I have a good seal on the bottom of my door . The price was a bit much , but if it last then it will be worth it .
Bottom Line Yes, I would recommend this to a friend
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