NGP 522N Heavy-Duty Mortise Au...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$160.07
NGP 522N Heavy-Duty Mortise Automatic Door Bottom with Neoprene Seal - Mill Aluminum BHMA Grade 1

NGP 522N Heavy-Duty Mortise Automatic Door Bottom with Neoprene Seal - Mill Aluminum BHMA Grade 1

(No reviews yet) Write a Review

Model: 522N-36

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

$160.07
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

NGP Heavy-Duty Mortise Automatic Door Bottom with Neoprene Seal - Mill Aluminum BHMA Grade 1

Professional Automatic Door Bottom Solution for Commercial Applications

The NGP Heavy-Duty Mortise Automatic Door Bottom delivers superior sealing performance with mill aluminum construction and neoprene seal technology. This BHMA Grade 1 certified door bottom features aluminum alloy 6063 T5 temper construction with synthetic EPDM rubber in polypropylene thermoplastic matrix, tested to 1,000,000 cycles for exceptional durability. Available in lengths from 11" to 60" with mortise requirements of 1" x 2-1/8" and maximum drop of 7/8", this automatic door bottom provides reliable sealing for both metal and wood door applications.

Professional Features & Benefits

  • Heavy-Duty Durability: BHMA certified to ANSI/BHMA A156.22 with 1,000,000 cycle test rating for long-term reliability in high-traffic commercial applications.
  • Premium Construction: Aluminum alloy 6063 T5 temper with synthetic EPDM rubber in polypropylene thermoplastic matrix provides exceptional strength and sealing performance.
  • Wide Temperature Range: Operates effectively from -20 F to 200 F with excellent resistance to ozone, sunlight, and aging for versatile installation environments.
  • Flexible Sizing Options: Available in lengths from 11" to 60" with field cutting capability for doors 36" and longer (up to 4" reduction) for installation flexibility.
  • Fire Rating Compatibility: Suitable for up to 3-hour metal doors and 45-minute wood doors for code compliance applications.
  • Professional Installation Features: Mortise requirement of 1" x 2-1/8" with 7/8" maximum drop and included #4 x 5/8" SMS fasteners for secure mounting.
  • Superior Sealing Performance: Flame-resistant and moisture-resistant design with very good abrasion resistance, tensile strength, and memory for consistent operation.
  • Quality End Cap Options: Anodized aluminum end caps furnished standard with optional DKB end caps available for aesthetic preferences.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Product Category: Door Trim and Accessories
  • Product Group: Door Trim and Accessories
  • Product Subgroup: Door Bottom Sweeps and Door Shoes
  • Product Type: Automatic Door Bottoms
  • Subcategory: Gaskets & Weatherstripping

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 bottom products deliver professional-grade reliability with aluminum alloy 6063 T5 temper construction and BHMA Grade 1 certification rated for 1,000,000 cycles. The synthetic EPDM rubber sealing system provides superior performance across temperature ranges from -20 F to 200 F with excellent resistance to environmental factors. Engineered for demanding commercial applications where dependable sealing performance and fire rating compliance are essential.

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Door Bottom Sweeps and Door Shoes
Product Type:
Automatic Door Bottoms
Subcategory:
Gaskets & Weatherstripping
Commercial/Residential:
Commercial
Product Category:
Door Trim and Accessories
Department:
Door Hardware

NGP 522N-36 – Frequently Asked Questions

1) What size mortise pocket do I need to rout for the NGP 522N automatic door bottom?
Rout a 1 inch by 2-1/8 inch pocket into the bottom edge of the door. The 522N drops a maximum of 7/8 inch below the door once mortised, so set your undercut with that drop in mind. Mounting uses the #4 x 5/8 inch sheet metal screws that come with it.
2) Is this NGP automatic door bottom approved for use on a fire rated door?
It is rated for metal doors up to 3 hours and wood doors up to 45 minutes. If your opening is a 60 or 90 minute wood door, this one does not cover it.
3) Will a mortise automatic door bottom work on my door, or do I need a surface mounted one?
A mortise unit like the NGP 522N has to be routed into the door bottom, a 1 inch by 2-1/8 inch pocket, so the door has to be thick enough and solid enough to take that cut and you usually want the door off the hinges. If you cannot mortise the door, or you are retrofitting in place, go surface mounted instead. The Pemko SA Series surface mount automatic door bottom screws to the face of the door with no routing.
4) What is the difference between the NGP 522N automatic door bottom and the Pemko SA Series surface mount automatic door bottom?
Both seal the gap under a door automatically as the door closes, but they mount differently. The NGP 522N is a mortise unit: it drops into a routed pocket in the door bottom measuring 1 inch by 2-1/8 inches, so the housing is concealed inside the door. The Pemko SA3-36 is a surface mount automatic door bottom, fastened to the face of the door with no routing required, and it uses a GREENGUARD Gold certified Eco-V insert. The 522N uses a neoprene seal and is BHMA Grade 1 certified to ANSI/BHMA A156.22 with a 1,000,000 cycle rating, with a maximum drop of 7/8 inch. Choose the mortise 522N when the door can be machined or is being prepped at the shop; choose a surface mount unit when you are retrofitting an existing door in place.
5) Can I use a door bottom sweep instead of the NGP 522N automatic door bottom?
They do different jobs. The NGP 522N is an automatic door bottom - a mechanical unit that drops its neoprene seal only when the door closes and lifts it clear when the door opens, which keeps the seal off the floor covering. The Pemko 345 Series is a door bottom sweep, a fixed strip with a PemkoPrene insert that rides against the threshold or floor at all times, and the 345 version also carries a rain drip for exterior openings. A sweep is the simpler part with no moving mechanism and no door routing, but it drags over carpet or uneven floors and does not retract. The 522N requires a 1 inch by 2-1/8 inch mortise pocket and offers up to 7/8 inch of drop for larger undercuts.
6) How durable is the NGP 522N for a high traffic entrance?
It is BHMA Grade 1 certified to ANSI/BHMA A156.22 with a 1,000,000 cycle test rating, which is the top durability tier for this category. Body is 6063 T5 aluminum alloy. For a school corridor, hospital, or office entry seeing constant use, that cycle rating is the number to standardize on.
7) Will the seal hold up in an unconditioned warehouse or exterior door?
The seal is synthetic EPDM rubber in a polypropylene thermoplastic matrix, rated from -20 F to 200 F, with resistance to ozone, sunlight, and aging plus flame and moisture resistance. That covers unheated warehouse bays and exterior openings in most climates.
8) What lengths does the NGP 522N come in?
Stock lengths are 36, 48, and 60 inches, with the 522N family spanning 11 to 60 inches. Pick the length that matches your door width, or the next size up if you plan to field cut (36 inch and longer units take up to a 4 inch trim).
9) What is the difference between an automatic door bottom and a door sweep with a rain drip?
An automatic door bottom like the 522N retracts when the door swings and drops the seal only when the door closes, so nothing drags on the floor or the carpet. A sweep such as the Pemko 345 Series with PemkoPrene insert is a fixed seal mounted to the door face that rides the threshold continuously, and its rain drip sheds water away from the bottom of an exterior door. Use the automatic bottom where you need a clean seal without floor drag or where the floor finish changes; use the sweep where the job is shedding weather and the budget and install time are tighter.
10) Can I use the NGP 522N on a wood door as well as a hollow metal door?
Both. It mortises into metal and wood doors alike. The one thing that changes by material is the fire rating, 3 hours on metal versus 45 minutes on wood, so a rated wood opening above 45 minutes needs a different device.
11) I need a door bottom for an exterior opening with rain exposure - is the NGP 522N the right choice?
For a door taking direct weather, a sweep with an integral rain drip is the more common choice: the Pemko 345 Series 36 inch door bottom sweep pairs a PemkoPrene insert with a rain drip that sheds water away from the door bottom. The NGP 522N is an automatic door bottom with a neoprene seal rated from -20 F to 200 F with good resistance to ozone, sunlight, and aging, and it is moisture resistant, so it holds up outdoors, but it carries no rain drip. On an exterior opening many specs use both: a 522N mortised into the door for the seal and a separate drip cap above. The 522N does bring BHMA Grade 1 certification to ANSI/BHMA A156.22 at 1,000,000 cycles.
12) For a fire rated opening, does the NGP 522N or the Pemko SA Series surface mount unit fit better?
The NGP 522N is suitable for up to 3-hour metal doors and 45-minute wood doors, which covers most rated corridor and stair openings, and it is BHMA Grade 1 certified to ANSI/BHMA A156.22 with a 1,000,000 cycle test rating - useful when a facility is standardizing on one part across high-traffic rated doors. It does require the door to be prepped with a 1 inch by 2-1/8 inch mortise, so on an existing rated door label rules govern whether that machining is permitted in the field. The Pemko SA3-36 is the surface mount alternative when you cannot rout the door, and it uses a GREENGUARD Gold certified Eco-V insert if indoor air quality credits matter on the project.
13) My project has a sustainability requirement on interior materials - how does the NGP 522N compare on that?
If the specification calls for a third-party indoor air quality certification on the seal material, the Pemko SA3-36 surface mount automatic door bottom carries a GREENGUARD Gold certified Eco-V insert. The NGP 522N uses a neoprene seal built from synthetic EPDM rubber in a polypropylene thermoplastic matrix, in an aluminum alloy 6063 T5 temper housing, and is certified under ANSI/BHMA A156.22 at BHMA Grade 1 with a 1,000,000 cycle rating - a durability and performance certification rather than an emissions one. Match the part to whichever standard the submittal actually names.
14) I need a 48 inch or 60 inch automatic door bottom - does the Pemko SA3-36 cover that?
The Pemko SA3-36 is a 36 inch surface mount automatic door bottom. The NGP 522N mortise automatic door bottom runs in lengths from 11 inches to 60 inches and is stocked in 36 inch, 48 inch, and 60 inch, so it covers wide leaves and oversized openings that a 36 inch unit will not. The 522N can also be field cut on doors 36 inches and longer, up to a 4 inch reduction, which lets one length cover several door widths on the same job.
15) Do the end caps come with it, and can I get a different finish on them?
Anodized aluminum end caps ship standard with the 522N. DKB end caps are the optional alternative if you want a darker look against a bronze or dark frame. Fasteners are in the box as well.
16) Is the mill aluminum finish paintable or will it stand out against my frames?
Mill aluminum is the raw, unfinished aluminum look, a plain silver tone. It blends with aluminum storefront and clear anodized frames. Since the unit mortises into the door edge, only the housing lip and end caps show, and DKB end caps are the option if you need those to read darker.
How fast can I get the NGP 522N-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 522N-36 come with a warranty?
Absolutely. The NGP 522N-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 522N-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 522N-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.
!