Zero # 3552, Automatic Door Bottom, For Metal Doors, Mortised with Brush Seal, .5" Drop
This Zero International #3552 automatic door bottom is designed to be applied in the hollow channel found on metal doors. It is crafted from high quality material that will ensure smooth operation. It is fitted with a set of two rows of nylon brushes, see below for details. Available in clear anodized aluminum and is custom cut to size.
How to Size: To determine size required, see How to Measure for an Automatic Door Bottom. Can be cut an additional 2" in the field.
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This automatic door bottom is fitted with double set of nylon brush seals that compress against the floor to minimize infiltration of light, drafts, dust and moisture. The bristles are made of high quality material which remain flexible in extreme weather conditions and they conform well to surface irregularities, making them ideal to be applied over uneven surfaces, such as a tiled floor.
It is specifically designed for hollow metal doors with minimum 1.5" wide cavity.
Installation: Installation instructions and screws provided.
As with all our other high quality door bottoms, it has been successfully tested through 5 million cycles and is built to last! The aluminum casing is fully mortised, lending a clean look to any door. It is designed to be applied to a hollow metal door and has a maximum drop of .5 inches.
Please note, images are for illustrative purposes only. They are not actual photos. Therefore, actual colors may vary slightly and size may 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 to view our Full Warranty Policy.
Click here to view a rubber seal version of this product, Zero International #355Â Mortised Automatic Door Bottom with Double Neoprene Seal.
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QuickShipNo
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ManufacturerZero International
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MPN3552
- Product Design
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Seal TypeBrush Seal
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Mounting TypeFully Mortised
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Door TypeHollow Metal Door
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- Dimensions
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Casing Dimensions1.375" W x .750" H x Custom Cut Length up to 54".
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LengthCustom Cut to Size
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Drop SizeUp to .5" Drop
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Suggested Door Cut-OutDesigned for hollow metal doors with minimum 1.5" wide cavity.
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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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- Special Features
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Add FLO (Notched) SealYes
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- Finishes
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FinishClear Anodized Aluminum (US28)
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- Compliance Details
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Compliance DetailsFire Rated
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ANSI DesignationR3B3261
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Warranty1 Year Limited Warranty
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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.