NGP 320 Mill Aluminum Hollow M...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$80.50
$43.60
NGP 320 Mill Aluminum Hollow Metal Mortise Automatic Door Bottom with TPV Seal

NGP 320 Mill Aluminum Hollow Metal Mortise Automatic Door Bottom with TPV Seal

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Model: 320N-36

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

$80.50
$43.60
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NGP 320 Mill Aluminum Hollow Metal Mortise Automatic Door Bottom with TPV Seal

Professional Automatic Door Bottom Solution for Commercial Applications

The NGP 320 Mill Aluminum Hollow Metal Mortise Automatic Door Bottom provides reliable weathersealing for commercial hollow metal doors. Constructed from aluminum alloy 6063 with T5 temper for durability, this automatic door bottom fits in 1-5/8" x 3/4" channels and offers a 1/2" maximum drop. Available in lengths from 24" to 48" and furnished 1/2" shorter than ordered to fit within net door size, with field cutting capability up to 4".

Professional Features & Benefits

  • Precision Channel Fit: Designed for 1-5/8" x 3/4" channels with furring strip compatibility for deeper channel applications.
  • Flexible Length Options: Available 24" to 48" in length, furnished 1/2" shorter than ordered for proper door fit, with field cutting capability up to 4".
  • Durable Aluminum Construction: Aluminum alloy 6063 with T5 temper provides excellent strength and corrosion resistance for long-term performance.
  • Fire-Rated Performance: Fire ratings apply to metal doors only, ensuring code compliance in commercial applications.
  • Multiple Seal Options: Available with NGP-TPV seal (temperature range -80 F to 275 F), Silicone seal (-100 F to 500 F), or economical Vinyl seal (0 F to 140 F).
  • Weather Resistance: Flame resistant and moisture resistant construction protects against environmental elements.
  • Professional Installation: Includes #4 x 5/8" SMS fasteners for secure mounting to hollow metal doors.

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
  • Government and Municipal Buildings
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Retail Establishments

Seal Material Options

Choose from three seal materials to match application requirements: NGP-TPV seal offers excellent abrasion resistance and memory with temperature range -80 F to 275 F and good resistance to ozone, sunlight and aging. Silicone seal provides superior flexibility and memory with extended temperature range -100 F to 500 F and excellent resistance to ozone, UV and aging. Vinyl seal offers an economical solution with 0 F to 140 F temperature range using environmentally friendly bio-based plasticizer.

Why Choose NGP Quality?

NGP automatic door bottoms deliver professional-grade weathersealing with aluminum alloy 6063 T5 temper construction engineered for demanding commercial applications. The flame resistant and moisture resistant design ensures reliable performance in challenging environments where dependable door sealing is 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 320N-36 – Frequently Asked Questions

1) Will the NGP 320 automatic door bottom fit a hollow metal door, and does it need a mortised channel?
The NGP 320 is a mortised automatic door bottom, so it drops into a channel routed or factory-prepped into the bottom of the door. The channel needs to be 1-5/8 inches by 3/4 inch. If the existing channel is deeper than that, a furring strip fills the gap. It mounts to hollow metal with the #4 x 5/8 inch SMS fasteners supplied. If the door has no mortise pocket and you don't want to cut one, a surface-applied unit like the Pemko SA Series automatic door bottom is the type to look at instead.
2) How much gap will the NGP 320 door bottom close at the threshold?
Maximum drop is 1/2 inch. That is the gap between the bottom of the door and the finished floor or threshold that the seal can take up when the door closes. If the undercut on your opening is larger than 1/2 inch, this unit won't reach the floor and you need a different bottom or a raised threshold.
3) Can I use the NGP 320 automatic door bottom on a fire rated door?
Fire ratings on the 320 apply to metal doors only. On a hollow metal fire door assembly it's the correct application; on a wood or composite fire door the rating does not carry, so specify a different bottom for those openings.
4) What is the difference between an NGP 320 automatic door bottom and a Pemko 345 Series door bottom sweep?
They solve the same draft problem two different ways. The NGP 320 is a mortise automatic door bottom: it sets into a 1-5/8 inch by 3/4 inch channel routed or formed into the door bottom, and the seal drops 1/2 inch maximum when the door closes, lifting clear as the door swings so it does not drag the floor covering. The Pemko 345 Series is a door bottom sweep with a rain drip and a PemkoPrene insert - a fixed sweep that mounts to the face of the door and stays down at all times, with the drip cap shedding water away from the door bottom on exterior openings. Choose the 320 where carpet, thresholds, or an uneven floor make a permanently deployed seal impractical, and choose the 345 where a fixed exterior sweep with rain shedding is what the opening calls for.
5) What automatic door bottom can I use if the door has no mortise channel?
Use a surface mount automatic door bottom instead. The NGP 320 is a mortise unit and requires a 1-5/8 inch by 3/4 inch channel in the bottom of the door to receive the housing, so it is not an option on a door with a plain flat bottom rail unless you are willing to have the channel prepped. The Pemko SA Series surface mount automatic door bottom performs the same automatic function - it drops a seal on closing and retracts on opening - but fastens to the face of the door, which makes it the retrofit answer on existing hollow metal or wood doors that were never prepped for a mortised unit.
6) Is a 36 inch door bottom sweep an equivalent replacement for a 36 inch automatic door bottom?
No - the length matches but the part does not. A 36 inch Pemko 345 Series door bottom sweep is a fixed sweep that remains in contact with the floor whenever the door is hung, while the NGP 320 at 36 inches is an automatic unit whose seal drops 1/2 inch only as the door closes and retracts on opening. Swapping a sweep in where an automatic bottom was specified reintroduces the drag on carpet and thresholds that the automatic unit was chosen to avoid, and it will not sit in the 1-5/8 inch by 3/4 inch channel the 320 occupies. Match on function first, then on the 24 inch to 48 inch length the 320 covers.
7) Which seal material should I pick on the NGP 320: TPV, silicone, or vinyl?
Pick by temperature and exposure. The NGP TPV seal runs -80 F to 275 F with good abrasion resistance and resistance to ozone, sunlight, and aging, which suits most exterior commercial openings. Silicone runs -100 F to 500 F and holds flexibility and memory the longest, so it's the one for high heat or heavy UV. Vinyl is the economical choice at 0 F to 140 F and is better suited to interior openings, since a cold exterior door will push past its low end.
8) I'm standardizing door bottoms across a building with both prepped and unprepped doors. Can I use the NGP 320 everywhere?
Only on the doors with a mortise channel. The 320 needs a 1-5/8 by 3/4 inch pocket in the door bottom, so unprepped doors either get machined or get a surface-mounted unit instead, such as the Pemko SA Series automatic door bottom. Across the doors that are prepped, the 320 covers 24 to 48 inch widths with a consistent 1/2 inch drop, so one part number family handles the fleet.
9) Which automatic door bottom should I specify on a LEED or low-emitting materials project?
The Pemko SA Series surface mount automatic door bottom carries a GREENGUARD Gold certified Eco-V insert, which is the one to put on the submittal when the specification calls out certified low-emitting interior materials. The NGP 320 is specified by seal chemistry rather than an emissions certification: NGP-TPV rated -80 F to 275 F, silicone rated -100 F to 500 F, or vinyl rated 0 F to 140 F using a bio-based plasticizer. On a project where the driver is temperature range or chemical exposure, the 320 seal options are the ones to compare; where the driver is a certified low-emitting product line, the SA Series insert is what the reviewer is looking for.
10) What should I use on an exterior door that needs water shed at the bottom rather than just an air seal?
Look at the Pemko 345 Series door bottom sweep with rain drip - the drip element is what throws water clear of the door bottom and the threshold, which a plain automatic bottom does not do. The NGP 320 is a mortised automatic bottom with a moisture resistant, flame resistant build and a seal you can pick for the temperature range at the opening, and on exterior work it is commonly paired with separate drip and threshold components rather than being asked to shed water on its own. If the drawing shows a rain drip at the door bottom, the 345 Series is the part carrying that feature.
11) Is the NGP 320 aluminum body suitable for an exterior door?
The housing is 6063 aluminum in T5 temper, which is the standard extrusion alloy for exterior architectural trim and resists corrosion well. The finish is mill aluminum, so it's the raw unfinished extrusion rather than an anodized or painted color. Paired with the TPV or silicone seal, it's built for exterior hollow metal.
12) Do I get the mounting screws with the NGP 320, or is that a separate order?
#4 x 5/8 inch sheet metal screws come with the unit for fastening to hollow metal. The one extra item to plan for is a furring strip, needed only if the door's existing channel is deeper than the 1-5/8 by 3/4 inch the 320 is sized for.
How fast can I get the NGP 320N-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 320N-36 come with a warranty?
Absolutely. The NGP 320N-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 320N-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 320N-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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