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

TMH Automatic Door Bottom, Surface Mounted with Neoprene Seal, Regular Duty, .75" Drop - QuickShip
Product Specs

This Regular Duty, Surface Mounted, Automatic Door Bottom will ensure a proper and tight seal to the gap at the bottom of your door. Will block, sound, light, drafts and more. Equipped with a long-lasting, high-quality, neoprene seal and mechanism that has been tested to 5 million opening and closings. Smoke and Fire-rated, this ADB is available in 2 finishes and 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" long ship within 1 Business Day! For custom sizes, see our Surface Mounted Automatic Door Bottom #351.

Price: $67.00
Size (Inches)
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SKU T351A-30
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This is a QuickShip product, available in stock sizes only - for custom sizes see our full product Surface Mounted Automatic Door Bottom #351.

Dimensions: Casing measures 1.793" x .722" and is made of .085" thick aluminum.

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

Finishes:  Available in Clear Anodized and Dark Bronze Anodized Aluminum.  

Seal: Casing is fitted with solid neoprene seal with a maximum drop of .75". It can be used directly above the floor, or with a Doorway Threshold.

Compliance Details: Rated for fire and smoke and is UL Listed (see Product Data for details.)

Handing: Non Handed, Compatible with both right and left handed doors.

Installation: Model is designed to be surface mounted. Installation instructions and screws provided. Screws are colored to coordinate with casing.

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 has a 3 year guarantee against defects in material and workmanship.
Click to view our Full Warranty Policy.

Click here to view our Heavy Duty Zero 365 Automatic Door Bottom.

How it Works

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

Complies with the following ANSI / BHMA codes: R3B334

Installation Guide

Click here for a Printable Copy of How to Install an 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. 


Once your door is ready for installation you need to determine the size required for your door bottom:

  • For a Surface Mounted Application: Measure the distance between the two stop moldings, or if a perimeter door gasket is applied, measure the distance between the two installed gaskets, then minus 1/8-1/4"” (.125”) from the total distance. That is the size needed for your door bottom.
  • For a Semi-Mortised and Fully Mortised Application: Measure your door from side to side; that is the measurement needed for your automatic door bottom.

For visual presentation see How to Measure for an Automatic Door Bottom.

How to Install an Automatic Door Bottom- Figure 1

Once you have determined 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).


How to Install an Automatic Door Bottom- Figure 1You can trim from the edge up to one inch of the screw in the side wall of the ADB.



How to Install an Automatic Door Bottom- Figure 3Surface Mounted and Semi-Mortised models need to be applied to the push side of the door only (the side with the door stops). The actuating plunger needs to be applied to the hinge side of the door for all applications.

Place the automatic door bottom against the door

Once you have the automatic door bottom leveled and positioned correctly, with a pencil or marker mark where the attachment screws need to be drilled.


How to Install an Automatic Door Bottom- Figure 4

To make installation easier you can drill a pilot hole which will ensure you attach the door bottom to the correctly marked spot. With the screws provided, screw in the automatic door bottom.

In some models, a plate is provided for the hinge side of the frame. This will protect the door frame from getting worn down by the actuating plunger. If provided, attach to corresponding point on the frame.



How to Install an Automatic Door Bottom- Figure 5Now that the door bottom is attached, test the door bottom by opening and closing the door to ensure there is a full seal. If the seal does not come down far enough twist the brass nut out, if it seals too tight twist the brass nut in.

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.

For additional assistance and product information, feel free to contact us. Our trained and friendly staff will guide you with all your soundproofing needs.


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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