Zero International 361AA Heavy...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$244.84
Zero 361AA Heavy Duty Automatic Door Bottom Clear Anodized Aluminum Finish

Zero International 361AA Heavy-Duty Surface Mounted Automatic Door Bottom

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Model: 361AA 36

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

$244.84
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Zero 361AA Heavy-Duty Surface Mounted Automatic Door Bottom

  • Sill Protection Automatic Door Bottom
  • Mount: Surface Mounted
  • Heavy Duty
  • Insert: Closed-cell Sponge Neoprene
  • Finish: Clear Anodized Aluminum
  • Maximum effective drop: 1"
  • Rated for up to "A" label (3hrs.)
  • Smoke Seal Rated
  • Sound Rated
  • Supplied with #361 End Caps
  • Supplied with closed-cell sponge neoprene, self-extinguishing, under MIL R 6130 Type II Class A, B, C
  • Rated for 5 million cycles
  • ZERO’s patented automatic door bottom technology ensures a tight seal against the floor or saddle. As the door is closed, an adjustable "plunger" is compressed against the door frame, activating a concealed flat spring mechanism. This mechanism drops the seal smoothly from the housing in a scissor-like motion as illustrated below. The door seal compresses tightly even on uneven surfaces and retracts automatically when the door is opened.
  • All ZERO automatic door bottoms function the same way. The concealed spring mechanism causes the insert seal to activate on the hinge side first. It prevents the seal from dragging along the floor or threshold while the door is being closed to avoid door hang-up or closing delay.

Product Specs

Commercial/Residential:
Commercial
Product Group:
Door Trim and Accessories
Product Subgroup:
Door Bottom Sweeps and Door Shoes
Product Type:
Door Bottom
Product Finish:
Clear Anodized
Performance Rating:
Fire Rated-UL10c
Product Substrate:
Aluminum
Department:
Door Hardware

Zero International 361AA 36 – Frequently Asked Questions

1) How big a gap under the door will a Zero 361AA automatic door bottom close?
Maximum effective drop on the 361AA is 1 inch. That's the working range between the housing and the floor or saddle, so if your undercut plus the out-of-level in the floor stays inside an inch, the seal will reach. Anything more than a 1 inch gap at the worst point along the sweep path and this won't close it, and you should be looking at a threshold or saddle to bring the floor up rather than a taller door bottom.
2) What lengths does the Zero 361 automatic door bottom come in, and how do I size it to my door?
Four lengths: 14, 36, 42 and 48 inches. Standard practice is to order the length that fits the door width and cut the aluminum housing down on site to the exact opening. The 14 inch is there for narrow leaves and small access doors, 36 inch covers a standard 3-0 door, and 42 and 48 inch cover wider single leaves and the leaves of a pair.
3) Do I need to mortise the door for the Zero 361AA, or does it screw to the face?
Surface mounted. The 361AA housing screws to the face of the door at the bottom rail, so there's no routing or mortising and no need to pull the door for machining. That makes it the retrofit choice on an existing opening where a mortised door bottom would mean taking the leaf off and running a router. End caps (#361) come with it.
4) Should I use an automatic door bottom or just a door sweep?
A sweep drags on the floor every time the door moves, which wears the seal, scuffs finished flooring and adds resistance a closer has to overcome. An automatic door bottom like the 361 stays retracted while the door swings and only drops when the door closes onto the frame: a plunger at the hinge jamb is compressed, releasing a concealed flat spring that scissors the seal down. Pick the automatic bottom on fire and smoke rated openings, on carpet or finished floor, and where a closer is fighting drag. Pick a plain sweep where none of that applies and the budget matters.
5) Will the Zero 361 seal against an uneven or worn concrete floor?
Yes, within the 1 inch drop. The closed-cell sponge neoprene insert compresses against the surface rather than riding rigid on it, so it takes up dips and slope in a concrete slab or a worn saddle. Where it won't help is a floor that falls away more than an inch below the housing at any point along the door width.
6) Is a Zero 361AA automatic door bottom durable enough for a high traffic entrance?
It's the heavy-duty model in the line and is rated for 5 million cycles, with an extruded aluminum housing. For a property manager standardizing across a building, that's the version to put on lobby, stair and corridor doors that cycle hundreds of times a day, rather than a light-duty bottom sized for an office or apartment interior door.
7) Does the Zero 361 drag on the carpet or slow the door from latching?
No, and that's the point of the mechanism. The concealed spring trips the seal on the hinge side first, so the insert isn't down across the floor while the leaf is still swinging. It avoids the hang-up and the delayed latching you get when a seal catches carpet or a threshold on the way closed, which matters on a fire door that has to latch every time.
8) Can I use a Zero 361 automatic door bottom on a pair of doors with no mullion?
Yes, one per leaf. Each 361 is triggered by its own plunger hitting the frame at the hinge jamb, so on a pair each leaf carries its own unit and seals independently to the floor. The 42 and 48 inch lengths cover the wide leaves you usually see on a pair. It seals the floor line only, so the meeting stile still needs an astragal if you're sealing the whole opening.
9) What finish does the Zero 361AA come in, and will it match my existing aluminum door hardware?
Clear anodized aluminum, the AA in the model number. That's the standard mill-look aluminum finish, so it sits next to clear anodized storefront framing, aluminum thresholds and glass door rails without standing out. If your openings are dark bronze or painted, this one will read bright against them.
How fast can I get the Zero International 361AA 36 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 361AA 36 come with a warranty?
Absolutely. The Zero International 361AA 36 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 361AA 36?
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 361AA 36 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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