Zero #350, Automatic Door Bottom, Mortised with Neoprene Seal, .75" Drop
Stock sizes are available to ship within 1 business day. Click here for our Quick Ship TMH Mortised Automatic Door Bottom.
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.
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. This automatic door bottom is a great options to soundproof everyday noises or for weatherproofing exterior doors.
About 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. Select from options above if required.
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 1 years against defects in material and workmanship.
Click to view our Full Warranty Policy.
Click here to see all our Drop Down Acoustical Bottom Seals.
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QuickShipNo
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ManufacturerZero International
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MPN350
- Product Design
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Seal TypeNeoprene Rubber Seal
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Mounting TypeFully Mortised
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Door TypeWooden Door
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- Dimensions
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Casing DimensionsCasing measures 1.560" H by 1.45" total width. Body measures .705" in width.
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LengthCustom Cut to Size
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Drop SizeUp to .75" Drop
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Suggested Door Cut-Out3/4" x 1-9/16"
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Door Thickness1-3/4" Thick
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- Installation
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HandingNon-Handed
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Installation ScrewsInstallation Screws Provided
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SizingTo determine sizing required see 'How to Size an Automatic Door Bottom'
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- Additional Options - Purchase Through Our Office
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Colored End CapsYes
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- Finishes
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FinishMill Finish Aluminum (US27)
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- Compliance Details
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Compliance DetailsFire Rated, BHMA Certified
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ANSI DesignationR3B3241
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Warranty5 Year Limited Warranty
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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.
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. |
STEP 1: PREPARE 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. |
STEP 2: MEASURE AND TRIM YOUR DOOR BOTTOM Measure your door from side to side. That will determine the length required for 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. |
STEP 3: 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. |
STEP 4: ADJUSTING 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. |