Zero 355A Semi Mortised Autom...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$86.80
Zero 355A Semi Mortised Automatic Door Bottom with Neoprene Seal

Zero 355A Semi Mortised Automatic Door Bottom with Neoprene Seal

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Model: 355A

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

$86.80
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The patented automatic door bottom technology from Zero ensures an efficient seal against the floor or saddle. As the door is closed, the adjustable plunger is compressed against the door frame, activating a concealed flat spring mechanism. Zero door bottoms are designed to block penetration by air, sound, smoke, and flames.

  • Semi-mortised, 1/2″ drop
  • AA = Anodized aluminum
  • For use with hollow metal doors
  • Supplied without end caps
  • Supplied with solid neoprene extrusion
  • Air Infiltration and sound tested
  • Fire-rated UL10C

Manufacturer Resources

Product Specs

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

Zero International 355A – Frequently Asked Questions

1) What is the Zero 355A automatic door bottom used for?
The Zero 355A provides automatic sealing at the bottom of doors. The neoprene seal drops when the door closes and retracts when opened. This prevents air, sound, smoke, and moisture infiltration.
2) What door types is the 355A compatible with?
This semi-mortised design works with wood and metal doors. Verify door thickness and bottom rail dimensions before ordering. Check manufacturer specifications for weight and size limits.
3) Does handing matter for installation?
Most automatic door bottoms are universal for left or right hand doors. Verify handing requirements in the installation template before cutting or mounting.
4) What finishes are available for the 355A?
Zero typically offers standard architectural finishes. Contact us to confirm available finishes for your specific project requirements and lead times.
5) What is the duty rating for this door bottom?
Zero door bottoms are engineered for commercial grade applications. Verify specific duty ratings and cycle testing data from manufacturer specifications for your project.
6) Does the 355A meet fire code requirements?
Check manufacturer listings for fire ratings and approvals. Verify local code requirements with your AHJ before specifying on fire-rated door assemblies.
7) Are replacement parts available?
Zero offers replacement seals and internal components. Keep model numbers for ordering correct parts. Browse our door hardware section for related components.
8) How is the 355A installed?
Semi-mortised installation requires cutting a recess in the door bottom. Use manufacturer template for precise measurements. Install per provided instructions to ensure proper operation.
9) How do I maintain an automatic door bottom?
Keep tracks clean of debris. Check seal for wear and proper drop/retraction. Lubricate moving parts per manufacturer schedule. Replace worn seals promptly.
10) What are similar Zero International models?
Zero offers various automatic door bottom configurations. Compare mortised, semi-mortised, and surface mount options. Check our Zero International selection for alternatives.
11) Will this work with uneven floors?
Automatic door bottoms compensate for minor floor irregularities. Severe unevenness may require floor preparation or adjustable threshold systems for optimal sealing.
12) What are the key measurements needed?
Measure door width, thickness, and bottom rail dimensions. Check clearance to floor when door is closed. Verify these measurements against manufacturer specifications before ordering.
How fast can I get the Zero International 355A 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 355A come with a warranty?
Absolutely. The Zero International 355A 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 355A?
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 355A 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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