NGP 331 Double Fin Door Shoe -...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$80.14
NGP 331 Double Fin Door Shoe

NGP 331 Double Fin Door Shoe - Aluminum Alloy Construction for 36" and 48" Hollow Metal Doors

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Model: 331-36

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

$80.14
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NGP Double Fin Door Shoe - Aluminum Alloy Construction for 36" and 48" Hollow Metal Doors

Professional Door Bottom Sealing Solution

The NGP Double Fin Door Shoe delivers reliable door bottom sealing for commercial hollow metal doors with inverted bottom channels. Constructed from aluminum alloy 6063 with T5 temper for durability, this door shoe features a rigid polypropylene top with flexible TPV fins for effective sealing. Available for 36" and 48" door widths, it comes furnished undrilled with #8 x 3/4" TEK screws for secure installation.

Professional Features & Benefits

  • Door Width Compatibility: Available for 36" and 48" door widths to accommodate standard commercial door sizes.
  • Heavy-Duty Construction: Aluminum alloy 6063 with T5 temper provides exceptional durability and corrosion resistance for long-term performance.
  • Dual-Material Design: Rigid polypropylene top with flexible TPV fins combines structural integrity with effective sealing performance.
  • Hollow Metal Door Compatibility: Specifically designed for hollow metal doors with inverted bottom channel configuration.
  • Complete Installation Hardware: Furnished with #8 x 3/4" TEK screws for secure mounting to door bottom.
  • Field-Customizable Length: Furnished undrilled allowing for precise field cutting and drilling to match specific door requirements.
  • Professional Appearance: Black polypropylene finish provides a clean, professional look that complements commercial door hardware.

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: Door Shoes
  • 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 door shoes deliver professional-grade reliability with aluminum alloy 6063 construction and T5 temper rating for demanding commercial applications. The dual-material design combines rigid polypropylene structure with flexible TPV sealing fins for long-lasting performance. Engineered specifically for hollow metal doors where dependable bottom sealing is essential for energy efficiency and environmental control.

Product Specs

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

NGP 331-36 – Frequently Asked Questions

1) Will the NGP 331 door shoe work on a hollow metal door with an inverted bottom channel?
That is exactly the opening the NGP 331 double fin door shoe is built for: hollow metal doors with an inverted bottom channel. The rigid polypropylene top seats against the channel and the flexible TPV fins do the sealing at the threshold. On a flush-bottom wood or solid core door you would be better off with a standard sweep or an L-shaped shoe instead.
2) I need a door shoe for an exterior opening exposed to rain - is the NGP 331 the right choice?
The NGP 331 seals with flexible TPV fins on an aluminum alloy 6063 body and does not include a rain drip. For an exterior opening where water needs to be thrown clear of the door bottom, the Pemko 211V is an L-shaped door shoe with a rain drip and a GREENGUARD Gold certified Eco-V insert, and the Pemko 215 door shoe also carries a rain drip along with its Eco-V insert.
3) What is the closest alternative to the NGP 331 door shoe if I need a fire-rated door bottom shoe?
The NGP 331 is a double fin door shoe with an aluminum alloy 6063 T5 body, a rigid polypropylene top and flexible TPV fins, sized for 36 inch and 48 inch hollow metal doors with an inverted bottom channel. If the opening requires a fire-rated shoe, look at the Pemko 210 fire-rated door bottom shoe with Eco-V insert in 36 inch aluminum construction, or the Pemko 215 fire-rated door shoe, which adds a rain drip and is UL10C certified. Both are door bottom shoes performing the same sealing role at the door bottom.
4) Do I need to buy screws separately for the NGP 331 door shoe?
No, fasteners come with it. The 331 is furnished with #8 x 3/4 inch TEK screws, which are self-drilling and suited to the metal channel on a hollow metal door. Since the shoe arrives undrilled, plan on laying out and drilling your own hole pattern on the job.
5) What is the NGP 331 door shoe made of, and will it hold up in an exterior or washdown opening?
The body is aluminum alloy 6063 with T5 temper, which resists corrosion and is the usual extrusion alloy for commercial gasketing. The sealing element is a rigid polypropylene top carrying flexible TPV fins, finished black. It is rated for commercial use across office, healthcare, education, retail, industrial and government openings.
6) Double fin versus a vinyl insert door shoe, which one should I use?
A double fin shoe like the NGP 331 uses two flexible TPV blades that flex against the floor, so it tolerates a slightly uneven or out-of-level slab better than a single solid bulb. A vinyl insert style, such as the Cal-Royal DS-403 or the Pemko 209, uses a replaceable insert seated in the extrusion, which many facilities prefer because the wear part swaps out without pulling the shoe off the door. Pick the fin style for sealing across an irregular floor, the insert style when you want field-replaceable seals.
7) I manage a building with a mix of 36 inch and 48 inch hollow metal doors. Can I standardize on one door shoe?
Yes. The NGP 331 covers both widths, 36 inch and 48 inch, in the same aluminum 6063 extrusion with the same black finish, so the doors match visually and your crews install the same part the same way. Anything narrower than 36 inches gets cut down from the 36 inch piece, since the shoe ships undrilled.
8) What is the difference between the NGP 331 door shoe and a vinyl insert door shoe like the Cal-Royal DS-403?
The NGP 331 uses a two-part sealing element - a rigid polypropylene top carrying flexible TPV fins - mounted to an aluminum alloy 6063 T5 extrusion. The Cal-Royal DS-403 is an aluminum door shoe with a vinyl insert, and the Pemko 209 door bottom shoe uses an Eco-V vinyl insert on a 1/2 inch by 1-3/8 inch profile. The practical difference is the sealing material and how the insert seats in the extrusion, so replacement inserts are not interchangeable between them.
9) I am ordering for 48 inch wide doors - do the Pemko door shoes cover that width?
The NGP 331 double fin door shoe is stocked in 36 inch and 48 inch lengths and is furnished undrilled so it can be cut and drilled to the opening. Among the comparable Pemko shoes, the 210 fire-rated door bottom shoe is a 36 inch aluminum length, so for a 48 inch leaf the NGP 331 is the direct fit without ordering a longer stock length.
10) Is the NGP 331 a GREENGUARD certified product for a green building spec?
For a project where the seal material needs a third-party indoor air certification, the Pemko 211V is the one to spec: its Eco-V insert is GREENGUARD Gold certified. The NGP 331 is a commercial aluminum 6063 and TPV fin shoe intended for general hollow metal openings.
How fast can I get the NGP 331-36 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 331-36 come with a warranty?
Absolutely. The NGP 331-36 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 331-36?
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 331-36 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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