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- Automatic Door Bottom
- Mount: Mortised
- Regular Duty
- Insert: Solid Neoprene Extrusion - self-extinguishing, under MIL R6855 Type II Class 40 oil resistant
- Finish: Clear Anodized Aluminum
- Maximum effective drop: 3/4"
- Fire Rated
- BHMA Certified
- ANSI/BHMA: R3B3241
- Supplied with screws and end caps
- 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.
- Lengths up to 90" are availabel as engineered specials.
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 350AA36 – Frequently Asked Questions
1) What is the Zero 350 door bottom used for?
The Zero 350 is a regular duty automatic door bottom designed to seal the gap between door and floor. It automatically drops when the door closes and retracts when the door opens. Used on interior and exterior doors for weather sealing and sound control.
2) What door widths does the Zero 350 accommodate?
Verify your specific door width against the manufacturer's sizing chart. Zero door bottoms come in various widths. Check the product specifications or manufacturer template to ensure proper fit for your door dimensions.
3) Does door handing matter for installation?
Door handing typically does not affect automatic door bottom installation. The unit mounts to the bottom rail of the door and operates regardless of swing direction. Verify mounting requirements with your specific door configuration.
4) What does clear anodized aluminum finish provide?
Clear anodized aluminum offers corrosion resistance and durability while maintaining the natural aluminum appearance. This finish works well with most door colors and provides professional appearance for commercial and residential applications.
5) Is this door bottom suitable for heavy commercial use?
The Zero 350 is rated for regular duty applications. For heavy commercial or high-traffic areas, consider heavy duty models. Regular duty works well for standard commercial doors with moderate usage and most residential applications.
6) What building codes apply to automatic door bottoms?
Check local building codes for gap requirements under doors. Some codes specify maximum gap sizes for fire doors or accessibility compliance. Verify the door bottom meets required sealing performance for your specific application and jurisdiction.
7) Are replacement parts available for the Zero 350?
Replacement seals and internal components are typically available for Zero door bottoms. Check with the manufacturer for specific part availability. Proper maintenance extends unit life and reduces need for replacement parts.
8) How is the Zero 350 door bottom installed?
Installation requires routing a channel in the door bottom rail to house the unit. Use manufacturer's template for precise measurements. Professional installation recommended to ensure proper operation and door integrity. Requires woodworking tools and skills.
9) How do you maintain an automatic door bottom?
Keep the track area clean of debris that could interfere with operation. Periodically check that the seal drops and retracts properly. Lubricate moving parts as recommended by manufacturer. Replace worn seals when sealing performance decreases.
10) What other Zero door bottom models are available?
Zero offers various door bottom models including heavy duty options and different finishes. Browse our door hardware selection for additional Zero models and comparable automatic door bottoms from other manufacturers.
11) What floor conditions work with automatic door bottoms?
Works on most hard floor surfaces including concrete, tile, wood, and carpet with low pile. Uneven floors may prevent proper sealing. Floor must be level enough for consistent contact with the dropped seal along the door width.
12) How do you measure for proper door bottom sizing?
Measure door width and check door bottom rail depth for adequate mortising space. Verify floor clearance when door is closed. Use manufacturer's installation template to confirm all dimensions before ordering. Consider door swing clearances and threshold conditions.
How fast can I get the Zero International 350AA36 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 350AA36 come with a warranty?
Absolutely. The Zero International 350AA36 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 350AA36?
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 350AA36 from ZenSupply?
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and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.