Zero #352, Automatic Door Bottom, Semi-Mortised with Neoprene Seal, .75" Drop
This Zero International #352, regular duty, semi-mortised automatic door bottom creates a tight seal at the bottom of doors to prevent infiltration of sound, light, drafts and more. Equipped with a high quality, long-lasting neoprene seal and mechanism that has been successfully tested through 5 million cycles! This model is fire rated. Available in choice of anodized finishes and length is custom cut to size.
How to Order: Selecting Finish and Exact Size will determine your total price. Note, product is priced per range with 18.25"-36" being the lowest priced range. To determine sizing needed for your door bottom, see How to Measure for an Automatic Door Bottom.
This Zero International #352, regular duty, semi-mortised automatic door bottom creates a tight seal at the bottom of doors to prevent infiltration of sound, light, drafts and more. Equipped with a high quality, long-lasting neoprene seal and mechanism that has been successfully tested through 5 million cycles!
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. Casing dimensions remain the same. To purchase, select from options above.
Sizing: To determine sizing required, 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 1 year guarantee against defects in material and workmanship.
Click here to view our Full Warranty Policy.
Click here to return to our Semi-Mortised Automatic Door Bottoms.
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QuickShipNo
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ManufacturerZero International
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MPN352
- Product Design
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Seal TypeNeoprene Rubber Seal
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Mounting TypeSemi-Mortised
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Door TypeWooden Door
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- Dimensions
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Casing DimensionsCasing measures 1.793" x .722" and is made of .085" thick aluminum.
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LengthCustom Cut to Size
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Drop SizeUp to .75" Drop
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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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- Finishes
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FinishClear Anodized Aluminum (US28), Dark Bronze Anodized Aluminum (313), Flat Black (US19)
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- Compliance Details
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Compliance DetailsFire Rated, BHMA Certified
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ANSI DesignationR3B3441
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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 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. |
STEP 1: SIZING YOUR DOOR BOTTOM Once your door is ready for installation you need to determine the size required for your door bottom:
For visual presentation see How to Measure for an Automatic Door Bottom. |
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).
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You can trim from the edge up to one inch of the screw in the side wall of the ADB. |
STEP 2: PREP FOR ATTACHING AUTOMATIC DOOR BOTTOM Surface 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. |
STEP 3: ATTACHING THE AUTOMATIC DOOR BOTTOM 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. |
STEP 4: TESTING YOUR AUTOMATIC DOOR BOTTOM Now 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.
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