NGP 683 Heavy-Duty Mortise Aut...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$160.00
$94.61
NGP 683 Heavy-Duty Mortise Automatic Door Bottom with Nylon Brush Seal - Mill Aluminum

NGP 683 Heavy-Duty Mortise Automatic Door Bottom with Nylon Brush Seal - Mill Aluminum

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Model: 683-36

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

$160.00
$94.61
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NGP Heavy-Duty Mortise Automatic Door Bottom with Nylon Brush Seal - Mill Aluminum

Professional Automatic Door Sealing Solution

The NGP Heavy-Duty Mortise Automatic Door Bottom provides reliable sealing for commercial applications with its durable aluminum alloy 6063, T5 temper construction and nylon brush seal. Designed for mortise installation requiring 1" x 2-1/8" preparation, this automatic door bottom accommodates doors from 11" to 60" in length with a maximum 7/8" drop. The synthetic polyamide brush seal offers excellent abrasion resistance and flexibility while operating effectively in temperature ranges from -70 F to 425 F.

Professional Features & Benefits

  • Heavy-Duty Construction: Aluminum alloy 6063, T5 temper provides exceptional durability and corrosion resistance for long-term commercial performance.
  • Flexible Length Options: Available in lengths from 11" to 60" with field cutting capability for doors 36" and longer (up to 4" reduction).
  • Mortise Installation: Requires 1" x 2-1/8" mortise preparation for secure, flush-mounted installation in door bottom rail.
  • Temperature Resilience: Operates reliably in extreme temperature conditions from -70 F to 425 F for diverse climate applications.
  • Carpet-Friendly Design: Nylon brush seal is specifically recommended for carpet applications where no threshold is provided.
  • Fire Rating Compatibility: Suitable for up to 3-hour metal doors and 45-minute wood doors for fire-rated applications.
  • Professional Installation Hardware: Includes #4 x 5/8" SMS screws and anodized aluminum end caps standard with DKB end caps available upon specification.
  • Precision Sizing: Doors 36" and longer are furnished 1/2" shorter than ordered to ensure proper fit within net door size.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Hang Type: Offset Hung
  • Product Category: Door Trim and Accessories
  • Product Group: Door Trim and Accessories
  • Product Subgroup: Door Thresholds
  • Product Type: Thresholds - Saddle
  • Series: Offset Threshold Series
  • Subcategory: Thresholds

Professional Applications

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

Why Choose NGP Quality?

NGP automatic door bottoms deliver professional-grade reliability with aluminum alloy 6063, T5 temper construction and synthetic polyamide brush seals engineered for excellent abrasion resistance and flexibility. The temperature range capability from -70 F to 425 F ensures dependable performance in demanding commercial applications where consistent sealing and durability are essential.

Manufacturer Resources

NGP Threshold Catalog

Product Specs

Product Group:
Door Trim and Accessories
Series:
Offset Threshold Series
Product Subgroup:
Door Thresholds
Product Type:
Thresholds - Saddle
Subcategory:
Thresholds
Commercial/Residential:
Commercial
Hang Type:
Offset Hung
Product Category:
Door Trim and Accessories
Department:
Door Hardware

NGP 683-36 – Frequently Asked Questions

1) What mortise prep does the NGP 683 automatic door bottom need in the door bottom rail?
The 683 mortises into the bottom rail with a 1 inch by 2-1/8 inch pocket. That is a routed prep, so the rail has to have enough meat left in it after the cut. Mounting hardware comes with it: #4 x 5/8 inch sheet metal screws and anodized aluminum end caps. DKB end caps can be specified instead.
2) Will an NGP 683 automatic door bottom seal over carpet with no threshold under the door?
That is exactly what the nylon brush version is for. NGP recommends the brush seal for carpet applications where no threshold is provided, because the brush sweeps across pile instead of trying to compress against a hard sill. The drop is up to 7/8 inch, so the seal reaches down that far when the door closes.
3) Can I cut an NGP 683 door bottom down to fit my door width?
Yes, on the longer sizes. Units 36 inches and longer can be field cut by up to 4 inches. Also worth knowing before you measure: doors 36 inches and longer are furnished 1/2 inch shorter than ordered so the unit sits inside the net door size. Order to your door width, not to the door width minus a fudge factor.
4) Can I use an NGP 683 mortise automatic door bottom on a fire rated door?
It suits up to 3 hour metal doors and 45 minute wood doors. Note the split: on a wood fire door you are limited to a 45 minute rating, so a 60 or 90 minute wood opening needs a different seal. Confirm the door manufacturer's listing allows a mortised bottom rail cut before you rout a labeled door.
5) What should I use instead of the NGP 683 automatic door bottom if the gap I need to close is at the floor rather than at the door?
The NGP 683 is a mortise automatic door bottom: it recesses into a 1 inch by 2-1/8 inch mortise in the bottom rail of the door and drops a nylon brush seal up to 7/8 inch as the door closes, so it travels with the door and is aimed at carpeted openings where no threshold is provided. If the condition is a floor gap or a level change at the opening, that is threshold work instead. The Pemko 272 is a flat saddle threshold in heavy-duty aluminum at 1/4 inch by 6 inches that mounts to the floor across the opening. The two solve different halves of the same opening and are commonly specified together rather than one in place of the other.
6) For a fire-rated opening, does the NGP 683 door bottom cover the fire requirement or do I still need a rated threshold?
The NGP 683 mortise automatic door bottom is suitable for use on up to 3-hour metal doors and 45-minute wood doors, so it can go into a rated door leaf. That rating applies to the door bottom itself; the saddle at the floor is a separate specification. The Cal-Royal CR3700 is a saddle threshold series carrying a 3-hour positive pressure fire rating, and the Cal-Royal CR2000 saddle threshold series is offered with a fire rated and ADA compliant design. Specify the door bottom for the leaf and the rated saddle for the opening.
7) If the opening has to meet ADA at the floor, will the NGP 683 automatic door bottom satisfy it?
No. ADA at an opening is a question about the change in floor level a wheelchair or cart crosses, and the NGP 683 is mounted in the bottom rail of the door with its nylon brush seal dropping onto the finished floor. The parts that address the floor profile are thresholds: the Pemko 272 is an ADA compliant flat saddle threshold at 1/4 inch by 6 inches in heavy-duty aluminum, and the Cal-Royal CR2000 saddle series is offered in a fire rated and ADA compliant design. Use one of those for the ADA line item and keep the 683 for sealing the gap under the leaf.
8) What lengths does the NGP 683 automatic door bottom come in?
Stock lengths are 36 inch and 48 inch, and the 683 is built in the 11 inch to 60 inch range. A 36 inch unit covers a standard 3-0 door leaf and the 48 inch covers a 4-0 leaf. Anything under 36 inches cannot be field cut, so size those to the opening at order time.
9) Should I use a mortise automatic door bottom or a surface mounted one?
A mortise unit like the 683 buries in a 1 inch by 2-1/8 inch pocket routed into the bottom rail, so nothing hangs below the door and the finished look is flush. That means machining the door, which is a new-door or shop decision. Surface mounted bottoms screw to the face of the door with no routing, which is the retrofit answer when the door is already hung and you do not want to pull it. Pick mortise when you can machine the door or are specifying it new; pick surface when you cannot.
10) Will a nylon brush automatic door bottom hold up in a boiler room or an unheated warehouse?
The synthetic polyamide brush is rated from -70 F to 425 F, so freezer vestibules, unconditioned warehouse doors and mechanical rooms are all inside its range. The extrusion is 6063-T5 aluminum alloy, which is the corrosion resistant temper used on commercial door trim.
11) Do I still need a threshold if I install an NGP 683 automatic door bottom?
Not for the carpet case. The brush seal is the option NGP calls out for openings with no threshold, where the door sweeps over carpet. If you do have a hard floor and want a defined sill to seal against, a saddle threshold is the companion piece: ZenSupply carries the Pemko 272 Series flat saddle in 1/4 inch by 6 inch heavy duty aluminum, and the Cal-Royal CR3700 saddle series carries a 3 hour positive pressure fire rating for rated openings.
12) The door is carpeted with no threshold at all. Is a saddle threshold or the NGP 683 the right call?
For carpet with no threshold provided, the NGP 683 nylon brush seal is the recommended approach: the brush conforms to carpet pile in a way a rigid sweep or a floor saddle does not, and the unit mortises into the door in a 1 inch by 2-1/8 inch prep so nothing is added at the floor for the carpet to meet. Adding a flat saddle such as the Pemko 272, at 1/4 inch by 6 inches, introduces a floor-mounted transition across the opening, which is what you want when the flooring changes or the level steps, not when carpet runs continuously through. The 683 is furnished in lengths from 11 inches to 60 inches, with 36 inch and 48 inch commonly stocked.
13) Is the mill aluminum finish on the NGP 683 the raw extrusion or is it coated?
Mill aluminum is the bare 6063-T5 extrusion with no applied color, which is the standard finish on commercial door bottoms and reads as a plain silver. The end caps supplied with it are anodized aluminum. If you are matching a building standard of dark bronze or clear anodized trim, the mill unit will not match those.
14) I need one automatic door bottom spec I can standardize across offices, classrooms and patient rooms. Does this one cover it?
The 683 is a commercial grade unit and the same 1 inch by 2-1/8 inch mortise prep applies across every length from 11 to 60 inches, so one shop detail covers the whole building. Where it stops working is the door type: wood fire doors are limited to a 45 minute rating and non carpeted openings are usually better served with a saddle threshold plus a bottom seal. Standardize on the 683 for carpeted interior openings and spec separately for the rated wood doors above 45 minutes.
How fast can I get the NGP 683-36 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 NGP 683-36 come with a warranty?
Absolutely. The NGP 683-36 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 NGP 683-36?
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 NGP 683-36 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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