NGP 420 Automatic Door Bottom ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$226.85
$165.05
NGP 420 Automatic Door Bottom with Neoprene Seal - Anodized Aluminum finish, surface mount, 7/8" max drop

NGP 420 Automatic Door Bottom with Neoprene Seal - Heavy Duty Surface Mount with 7/8" Drop

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Model: 420NA 42
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$226.85
$165.05
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NGP 420 Automatic Door Bottom with Neoprene Seal

Heavy Duty Surface Mount, 7/8" Drop

The NGP 420 is a surface-mount automatic door bottom for commercial applications. The housing is aluminum alloy 6063 T5 temper. The seal is a synthetic rubber polymer blend of PVC, Nitrile rubber (NBR), and Chloroprene closed-cell elastomeric foam. Rated to ANSI/BHMA A156.22 Grade 1 at 1,000,000 cycles. Mounts on the push side of the door; a half-mortise option is available (specify HM in item number).

Key Specifications

  • BHMA Grade: Grade 1, certified to ANSI/BHMA A156.22
  • Cycle Rating: 1,000,000 cycles
  • Maximum Drop: 7/8"
  • Available Lengths: 36", 42", 48", 60" (field-cuttable up to 4" reduction on 36" and longer units)
  • Minimum Length: 11"
  • Housing Material: Aluminum alloy 6063 T5 temper
  • Seal Material: PVC, Nitrile rubber (NBR), and Chloroprene closed-cell elastomeric foam
  • Temperature Range: -20 F to 200 F
  • Seal Resistance: Ozone, sunlight, aging, flame, and moisture resistant
  • Mounting: Surface mount, push side; half-mortise option available
  • Finishes: Anodized Aluminum, Gold, Dark Bronze
  • Use with Threshold: Recommended for optimal sealing performance

Typical Applications

  • Commercial office buildings
  • Educational facilities
  • Healthcare institutions
  • Retail establishments
  • Industrial and warehouse facilities
  • Multi-tenant residential properties
  • Government and municipal buildings

Product Specs

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

NGP 420NA 42 – Frequently Asked Questions

1) Will the NGP 420 automatic door bottom seal a gap under a door without a threshold?
The 420 drops up to 7/8 inch when the door closes, so it will bridge a fair gap, but NGP recommends pairing it with a threshold for full sealing. Without a threshold you are sealing against bare floor, and any dip or slope in the slab is gap the seal cannot follow. On a retrofit where the floor is uneven, plan on a threshold under it.
2) What length NGP 420 do I order for a 36 inch door, and can I cut it down on site?
Order the length that matches the door and trim to fit. The 420 comes in 36, 42, 48 and 60 inch lengths, and units 36 inches and longer can be field cut by up to 4 inches. So a 36 inch unit covers a 36 inch door leaf, and a 42 inch unit can be cut back to 38. Anything shorter than the range means ordering a shorter unit rather than hacking length out of a long one, since the mechanism sits inside the housing.
3) Does the NGP 420 mount on the face of the door or does it need to be mortised in?
Surface mount, on the push side of the door. That is the whole appeal on a retrofit: no routing the door bottom, just fasten the housing to the face and set the drop. If you want it recessed for appearance or to keep the projection off the face, NGP offers a half mortise version, specified by adding HM to the item number.
4) Is the NGP 420 door bottom rated for a high traffic commercial entry?
It is certified to ANSI/BHMA A156.22 at Grade 1, tested to 1,000,000 cycles along with heat and cold resistance testing. The housing is 6063 T5 aluminum alloy. For a school corridor, a hospital wing, or a tenant entry that cycles all day, that is the durability class you want, and the A156.22 Grade 1 citation is what a spec writer or facilities buyer needs on the submittal.
5) Automatic door bottom or a door sweep, which one do I actually need?
A sweep seals all the time, dragging on the floor whenever the door swings. An automatic door bottom like the NGP 420 stays retracted and only drops its seal when the door closes, so it clears carpet, thresholds and uneven flooring on the swing and does not wear the seal every cycle. Pick the automatic bottom where the door drags, where you need a smoke or sound seal at the bottom rail, or where a dragging sweep would be a nuisance. Pick a sweep, such as the Pemko 345 Series door bottom sweep with rain drip, where the floor is flat, the gap is constant, and the simpler part will do.
6) What is the equivalent of the NGP 420 automatic door bottom from Pemko?
The Pemko SA Series surface mount automatic door bottom is the closest peer. Both are automatic door bottoms rather than fixed sweeps, meaning the seal retracts as the door swings and drops onto the threshold when the door closes. The NGP 420 uses a neoprene seal with a 7/8 inch maximum drop and carries BHMA Grade 1 certification to ANSI/BHMA A156.22 at 1,000,000 cycles; the Pemko SA Series carries a GREENGUARD Gold certified Eco-V insert, which matters where a project is chasing indoor air quality credits. Both surface mount, so the door prep is the same decision either way.
7) I need to seal a 60 inch wide door. Will the Pemko sweep or automatic bottom cover it?
The Pemko 345 Series door bottom sweep and the Pemko SA Series surface mount automatic door bottom are both cataloged at 36 inches. The NGP 420 automatic door bottom runs from an 11 inch minimum to a 60 inch maximum, offered in 36, 42, 48 and 60 inch lengths, and units 36 inches and longer can be field cut by up to 4 inches. For a 60 inch leaf, or for anything that needs trimming to a nonstandard width on site, the 420 covers the range in one part number family.
8) Will an automatic door bottom hold up on an exterior door in freezing weather?
The 420 seal is rated from -20 F to 200 F, with stated resistance to ozone, sunlight and aging. The insert is a synthetic rubber polymer blend of PVC, nitrile rubber and chloroprene closed cell elastomeric foam, which is why it handles that spread rather than going brittle in cold or taking a set in summer heat. Exterior use is within its range.
9) What should I use instead of an automatic door bottom on an exterior door that takes driving rain?
The Pemko 345 Series door bottom sweep includes a rain drip, a projecting fin above the sweep that throws water clear of the door bottom before it can track under. The NGP 420 automatic door bottom does not include a rain drip; it is a surface mount unit intended to be paired with a threshold for its sealing performance. On a weather-exposed exterior opening where water shedding is the priority, the 345 with the rain drip addresses that directly. On an interior opening where the seal needs to clear the floor covering as the door swings, the 420 is the one that does that.
10) Which door bottom do I specify for a LEED or indoor air quality sensitive project?
The Pemko SA Series automatic door bottom uses a GREENGUARD Gold certified Eco-V insert, which is the certification specifiers cite for low chemical emissions in schools and healthcare. The NGP 420 uses a synthetic rubber polymer blend of PVC, nitrile rubber and chloroprene closed cell elastomeric foam, and answers a different part of the spec: BHMA Grade 1 certification to ANSI/BHMA A156.22 at 1,000,000 cycles, with a service range of -20 F to 200 F. If the submittal is driven by emissions certification, the SA Series carries it; if it is driven by cycle-tested durability on a high traffic opening, the 420 carries that.
11) Can I replace a Pemko 345 sweep with an NGP 420 without changing the door?
Both parts mount to the face of the door rather than requiring a mortised channel, so no new door prep is needed for the swap in its standard form. The Pemko 345 Series is a fixed sweep that seals continuously against the floor; the NGP 420 surface mounts on the push side and drops 7/8 inch only on closing. The practical change is floor clearance: a fixed sweep needs the undercut sized so it drags acceptably, while the 420 stays clear until the door shuts. Confirm the existing undercut and threshold height before ordering, since NGP recommends pairing the 420 with a threshold for full sealing. A half mortise version of the 420 is also available by specifying HM in the item number if a recessed installation is preferred.
12) What finishes does the NGP 420 automatic door bottom come in?
Three: anodized aluminum, gold and dark bronze, and every one of them is offered in all four lengths (36, 42, 48 and 60 inches). For a property manager standardizing a building, that means you can run the same finish across every door width without mixing product lines. Anodized aluminum is the usual match for aluminum storefront and clear anodized frames; dark bronze matches bronze anodized entrances.
13) Can I use the NGP 420 on an interior office or classroom door, or is it just for exterior openings?
Both. It is a commercial rated part, and the 1,000,000 cycle Grade 1 certification is aimed at office buildings, schools, healthcare, retail, warehouse, multi-tenant residential and government facilities. Interior use is common for closing the gap at the bottom rail on corridor and classroom doors where sound and air transfer between spaces is the issue, not weather.
14) If I want the automatic drop action but need a bronze or gold finish to match existing hardware, what are my options?
The NGP 420 automatic door bottom is offered in anodized aluminum, gold and dark bronze across all four lengths, so a fleet of openings with mixed trim finishes can be standardized on one series. The Pemko SA Series is the peer automatic door bottom in the set and is specified by its Eco-V insert rather than by a finish range. Where matching the existing door trim across a building matters as much as the seal itself, the 420 gives you the three finishes without changing series.
How fast can I get the NGP 420NA 42 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 420NA 42 come with a warranty?
Absolutely. The NGP 420NA 42 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 420NA 42?
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
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