Home > Door Seals > Automatic Door Bottoms > Mortised > Zero #350, Automatic Door Bottom, Mortised with Neoprene Seal, .75" Drop

Zero #350, Automatic Door Bottom, Mortised with Neoprene Seal, .75" Drop

Zero #350, Automatic Door Bottom, Mortised with Neoprene Seal, .75" Drop
Product Specs of Automatic Door Bottom #350 Mortised Regular Duty Automatic Door Bottom with Neoprene Seal #350 Automatic Door Bottom #350 Mortised into Interior Wooden Door in Open Position Automatic Door Bottom #350 Mortised into Interior Wooden Door in Closed Position

This Zero International #350, Fully Mortised, Regular Duty Automatic Door creates a tight seal at the bottom of doors to prevent infiltration of sound, light, drafts and more. Fitted with a solid neoprene seal and high quality mechanism that has been successfully tested through 5 million cycles! This model is fire rated. Length is custom cut to size (see below for details).

Note, this product is priced per range with 18.25" - 36" being the lowest priced range. To determine sizing needed, see How to Measure for an Automatic Door Bottom.

Stock size items are available to ship within 1 business day. Click her for our Quick Ship TMH Mortised Automatic Door Bottom.

Price: $55.38
Size Range
Exact Size
Save to wishlist
SKU Z350AA|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 maintain their clean unobtrusive look.

Dimensions:  Casing measures 1.560" H by 1.45" total width. Body measures .705" in width. Compatible with doors of 1-3/4" thickness and above. Length is custom cut to size.

Suggested Door Cutout: 3/4" x 1-9/16"

Seal: Solid neoprene seal, self-extinguishing and oil resistant. Seal has a maximum drop of .75".

Compliance Details:  Rated for Fire and is UL listed (see Product Data Tab for details.)

Handing:  Compatible with both right and left handed doors.

Installation: Fully mortised aluminum casing. Installation instructions and screws provided.

Additional Options - 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. Contact us at 845-388-1300 to purchase.

Sizing:  How To Measure For An Automatic Door Bottom.

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.

Click here to see all our Drop Down Acoustical Bottom Seals.

This product is guaranteed for 1 years against defects in material and workmanship.
Click to view our Full Warranty Policy.

Product Specs
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. These automatic door bottoms have been successfully tested through 5 million cycles!

See also About Automatic Door Bottoms.

Compliance Details

product specs for z350

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)
  • Good Design (1)
  • Quality Materials (1)
best uses

Reviewed by 1 customers

Displaying reviews 1-1

By Pronto

from Whitefish, MT

About Me Professional

Verified buyer
Quality product, I would buy it again
  • Easy To Use
  • Good Design
  • Quality Materials
best uses
Comments about Zero #350, Automatic Door Bottom, Mortised with Neoprene Seal, .75" Drop:
Easy to cut down to proper length
Bottom Line Yes, I would recommend this to a friend
Displaying reviews 1-1
Recently Viewed