Zero International 369AA Heavy...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$184.89
Zero 369 Heavy Duty Automatic Door Bottom Clear Anodized Aluminum Finish

Zero International 369AA Heavy-Duty Full Mortise Automatic Door Bottom with Fire-Rated Seal

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Model: 369A36

In Stock (leaves warehouse same day if ordered before 3pm ET)

$184.89
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Zero International 369AA Heavy-Duty Full Mortise Automatic Door Bottom with Fire-Rated Seal

The Zero International 369AA Heavy-Duty Full Mortise Automatic Door Bottom uses patented automatic door bottom technology to create an efficient seal against the floor or saddle. As the door closes, the adjustable plunger compresses against the door frame, activating a concealed flat spring mechanism that lowers the seal into place. Constructed with an anodized aluminum (AA) housing and supplied with a double solid neoprene seal, this door bottom is engineered to block penetration by air, sound, smoke, and flames. It carries a UL10C fire rating and meets ANSI/BHMA R3B3241 standards, making it a reliable choice for commercial door assemblies requiring code-compliant perimeter sealing.

Key Features

  • Automatic Activation: Adjustable plunger compresses against the door frame during closing, activating a concealed flat spring mechanism for consistent, hands-free sealing.
  • Anodized Aluminum Construction: The AA designation indicates a durable anodized aluminum housing built to withstand frequent commercial door cycling.
  • Double Solid Neoprene Seal: Supplied with a double solid neoprene seal for effective resistance against air, sound, and smoke infiltration at the door bottom.
  • Fire-Rated Performance: UL10C fire-rated construction supports use in fire-rated door assemblies where code compliance is required.
  • ANSI/BHMA Compliance: Meets ANSI/BHMA R3B3241 standard for automatic door bottoms, confirming tested performance and quality.
  • Full Mortise Installation: Designed as a full mortise unit for a clean, concealed installation into the bottom of the door.
  • Undercut Guidance: Manufacturer recommends consulting your local Authority Having Jurisdiction (AHJ) to confirm maximum allowable door undercut for proper fit and code compliance.

Certifications & Compliance

  • Fire-Rated UL10C
  • ANSI/BHMA R3B3241

Technical Specifications

  • Commercial/Residential: Commercial
  • Product Group: Door Trim and Accessories
  • Product Subgroup: Door Bottom Sweeps and Door Shoes
  • Department: Door Hardware

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Zero International 369AA?

Zero International door bottoms are engineered with patented sealing technology, anodized aluminum construction, and a double solid neoprene seal to deliver dependable performance against air, sound, smoke, and flame infiltration. Backed by UL10C fire-rated certification and ANSI/BHMA R3B3241 compliance, the 369AA is built for demanding commercial door assemblies where code-compliant sealing performance is essential.

Product Specs

Commercial/Residential:
Commercial
Product Group:
Door Trim and Accessories
Product Subgroup:
Door Bottom Sweeps and Door Shoes
Product Type:
Door Bottom
Department:
Door Hardware

Zero International 369A36 – Frequently Asked Questions

1) What length Zero 369AA automatic door bottom do I order for a 36 inch wide door?
The 36 inch unit. Zero builds the 369AA in 30, 32, 36, 40 and 42 inch lengths, so the common commercial leaf widths are covered. Size it to the door leaf and not the frame opening: the 369AA is a full mortise unit, so the housing sits in a channel machined into the bottom edge of the door and cannot run wider than the door itself.
2) Is the Zero 369AA automatic door bottom approved for use on a labeled fire door?
Fire rated to UL10C, and certified to ANSI/BHMA R3B3241 for automatic door bottoms, so it belongs on a rated assembly where the gasketing schedule calls for a bottom seal. The seal supplied is double solid neoprene, which is what handles the smoke and flame side of the opening. The one thing still to verify on your door is bottom clearance, since Zero directs you to your local Authority Having Jurisdiction for the maximum undercut permitted on the assembly.
3) Will an automatic door bottom drag on carpet the way a door sweep does?
No. On the 369AA the seal is only down when the door is closed. An adjustable plunger on the end of the housing meets the frame as the door shuts, which trips a concealed flat spring and drives the neoprene seal down onto the floor or saddle. Swing the door open and the seal lifts back into the housing, so it passes over carpet, tile transitions and raised thresholds instead of scrubbing across them. That is the reason to spend on an automatic bottom rather than a fixed sweep on an opening with finished flooring.
4) Do I have to machine the door to install a Zero 369AA, or does it surface mount?
Machining is required. The 369AA is a full mortise automatic door bottom: a channel is cut into the bottom edge of the leaf and the anodized aluminum housing sits inside it, leaving nothing on the face of the door. Plan on taking the doors down to do it. Where the doors cannot be pulled or machined, an occupied floor or a leaf that will not take the pocket, a surface applied automatic door bottom or a surface mounted sweep is the direction to go, since those fasten to the door face with no routing.
5) How much undercut can I have under the door when I install a Zero 369AA on a fire rated opening?
Zero's guidance is to confirm the maximum allowable undercut with your local Authority Having Jurisdiction before ordering, because that number belongs to the opening and the code in force rather than to the door bottom. As a working figure, NFPA 80 holds clearance under a fire door to 3/4 inch, and an AHJ can be stricter. Measure the actual opening first, because a full mortise unit removes material from the bottom of the leaf and that cannot be put back.
6) My automatic door bottom is not touching the floor at one end. Is the Zero 369AA adjustable?
Adjustment is built in. The plunger the frame pushes against is adjustable, and that setting controls how far the seal drops when the door closes. A worn saddle, a settled slab or a leaf that was trimmed in the field all get dialed back in at the plunger instead of shimming or swapping the unit.
7) Does the Zero 369AA need a threshold under the door, or will it seal to a bare floor?
Either one. The 369AA is built to seal against the floor or against a saddle, so a finished slab, tile or a low transition works as long as the surface under the swing is flat and level. A saddle earns its place on a rough or sloped floor: solid neoprene needs a continuous flat surface to close against, and a broomed slab or a chipped tile joint leaves gaps the seal cannot follow.
8) Can one automatic door bottom cover both the fire rated and the non-rated doors in my building?
The 369AA handles both. It is a commercial grade automatic door bottom carrying UL10C and ANSI/BHMA R3B3241, which is what the rated openings need, and nothing about it rules out ordinary corridor and office doors. Lengths run 30, 32, 36, 40 and 42 inches, so a facility standardizing on one model can cover the usual leaf widths from a single line item.
9) Will an automatic door bottom cut sound coming under an office or exam room door?
It closes the largest leak in the opening. The 369AA drops a double solid neoprene seal onto the floor or saddle when the door shuts, and blocking that air path under the door is what stops sound from carrying through it. Keep in mind that the bottom is one side of a four sided problem: without gasketing at the head and jambs, noise still travels through the perimeter gap.
10) Will a Zero 369AA hold up in a high traffic opening like a school corridor?
The housing is anodized aluminum, which is what the AA in the model number refers to, and the 369AA is a commercial product rather than a residential one. Because the seal is only down while the door is closed, the neoprene is not being dragged across the floor on every swing the way a fixed sweep is, and that dragging is what wears sweeps out in corridor traffic.
How fast can I get the Zero International 369A36 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Zero International 369A36 come with a warranty?
Absolutely. The Zero International 369A36 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Zero International 369A36?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Zero International 369A36 from ZenSupply?
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