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TMH Automatic Door Bottom, Mortised with Neoprene Seal, Regular Duty, .75" Drop - QuickShip

TMH Automatic Door Bottom, Mortised with Neoprene Seal, Regular Duty, .75" Drop - QuickShip

This 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. Available in stock sizes, see options below.

PRICED PER PIECE - see full product details and specs in the tabs below

Available in stock sizes - 30", 32", and 36" ship within 24 HOURS! For custom sizes, see our Mortised Automatic Door Bottom #350.

Price: $55.38
Size (Inches)
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SKU T350A-30
Shipping See Shipping Tab Below

This is a QuickShip product, available in stock sizes only - for custom sizes see our full product Mortised Automatic Door Bottom #350.

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: Available in stock lengths. Can be cut up to 2" on the field.

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.

Sizing:  To determine sizing, see 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.

This product is guaranteed for 3 years against defects in material and workmanship.
Click to view our Full Warranty Policy.

For a heavy duty version, see our Mortised Heavy Duty Automatic Door Bottom #364.

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.


Product Specs
Compliance Details

ANSI / BHMA Code Compliance: R3B324

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 qualifies for QuickShip - will ship within 1 business day. Quantities may be limited.
    • If out of stock, shipping may take up to 2 weeks. Please call to confirm.
    • 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.
  • Alaska and Hawaii, Canada, and International Shipping:
  • Returns:
    • This products can be returned up to 30 days from date of purchase.
    • Item must be in new, resaleable condition. No restock fee will be applied.
    • 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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