NGP 178SDKB Overlapping Astrag...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$45.15
NGP 178SDKB Overlapping Astragal with Silicone Seal, Dark Bronze Aluminum Finish - angled product view showing mounting hole and seal profile

NGP 178SDKB Overlapping Astragal with Silicone Seal - Dark Bronze Aluminum Finish

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Model: 178SDKB-36

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

$45.15
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NGP 178SDKB Overlapping Astragal with Silicone Seal - Dark Bronze Aluminum

The NGP 178SDKB is an overlapping astragal with a synthetic rubber polymer siloxane seal, built for commercial door openings up to 120" in height. The frame is aluminum alloy 6063, T5 temper. The silicone seal maintains flexibility and memory across an extreme temperature range (-100 F to 500 F) and resists ozone, UV radiation, and aging. Certified to ANSI/BHMA A156.22 for heat and cold performance. Recommended for areas served by FM200 or Halon fire suppression systems.

Features

  • Maximum installation height: 120"
  • Temperature range: -100 F to 500 F
  • Frame material: Aluminum alloy 6063, T5 temper
  • Seal material: Synthetic rubber polymer siloxane (silicone)
  • Seal properties: Flame-resistant, moisture-resistant, ozone- and UV-resistant
  • Certification: ANSI/BHMA A156.22 (heat and cold performance tests)
  • Fire suppression compatibility: FM200 and Halon systems
  • Fasteners included: #10 x 3/4" SMS fasteners
  • Optional: FATT (Fast Attach Tape) installation option available
  • Finish: Dark Bronze
  • Application: Commercial

Common Applications

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

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Astragals, Gaskets and Weatherstripping
Product Type:
Astragals
Subcategory:
Gaskets & Weatherstripping
Commercial/Residential:
Commercial
Product Category:
Door Trim and Accessories
Department:
Door Hardware

NGP 178SDKB-36 – Frequently Asked Questions

1) Is the NGP 178SDKB astragal suitable for a clean agent fire suppression room like an FM200 or Halon space?
That is one of the applications NGP calls out for the 178SDKB. The silicone seal is flame resistant and moisture resistant, and NGP recommends it for rooms using FM200 or Halon fire suppression, where you need the door pair to hold the agent concentration rather than leak it out the meeting stile.
2) Does the NGP 178SDKB meet a spec calling for ANSI/BHMA A156.22 gasketing?
The 178SDKB is BHMA certified to the ANSI/BHMA A156.22 performance tests for heat and cold. If your drawing calls out A156.22 gasketing on the meeting stile, this astragal answers that line. It is a commercial-duty product, not a residential weatherstrip.
3) What is the difference between an overlapping astragal and a split astragal on a pair of doors?
An overlapping astragal like the NGP 178SDKB mounts on one leaf and laps over the meeting stile of the other, sealing the gap with a single piece and establishing a door-closing order. A split type mounts a half on each leaf so both doors stay independently operable, which is what you want when both leaves get regular traffic. The Pemko 369 split astragal with pile brush insert is the split option if free swing on both leaves matters more than a positive silicone seal.
4) I need to cover the gap around a lock on a double door, not seal the whole stile. Is this the right part?
No, that is a different part. The NGP 178SDKB is a full-height sealing astragal running the door height. If you only need to shield the latch and cylinder area against a pry attack, use a lock astragal instead: the Trimco 5001 stainless lock astragal works with mortise or cylindrical locks, and the Trimco 5002 measures 1-9/16 x 6 inches for cylindrical locks.
5) What is a direct alternative to the NGP 178SDKB overlapping astragal for a pair of doors?
For a double-door pair, the Cal-Royal EAST-501 is an aluminum T-astragal with a vinyl insert, and the Pemko 300 Series is an adjustable astragal with a self-adjusting pile brush. All three seal the meeting stile of a double-door opening, but the sealing element differs: the NGP 178SDKB uses a synthetic rubber polymer siloxane seal rated from -100 F to 500 F, the EAST-501 uses a vinyl insert, and the Pemko 300 uses pile brush. Silicone holds flexibility at temperature extremes and resists ozone, UV and aging; pile brush sweeps against an irregular meeting edge; vinyl is a solid-contact seal. Choose the insert material by the environment the pair sees.
6) Is a Trimco 5001 or 5002 lock astragal the same kind of part as the NGP 178SDKB?
No. The Trimco 5001 and 5002 are lock astragals in stainless steel, made to be used with mortise or cylindrical locks - the 5001 with mortise or cylindrical locks and the 5002 (1-9/16" x 6") with cylindrical locks. They are short pieces that address the lock area of the meeting stile. The NGP 178SDKB is a full-height overlapping astragal in aluminum alloy 6063, T5 temper with a silicone seal, furnished in 36" and 84" lengths for door heights up to 120", and it seals the length of the meeting stile rather than dressing the lock. If the goal is weather and smoke sealing along the whole pair, the Trimco parts do not do that job.
7) What should be used instead of an overlapping astragal when both leaves of the pair have to stay independently operable?
An overlapping astragal such as the NGP 178SDKB laps one leaf over the other, which establishes an inactive leaf. Where both leaves need to swing without one lapping the other, the Pemko 369 is a split astragal seal with a pile brush insert at 13/32" x 11/32" in aluminum, fire-rated - a split design puts half the seal on each leaf so neither overlaps. The 178SDKB is BHMA certified to ANSI/BHMA A156.22 heat and cold performance tests and carries a silicone seal; the 369 seals with pile brush. Match the choice to whether the opening is a true double-egress pair or an active/inactive pair.
8) What is included with the NGP 178SDKB astragal, and do I need to buy screws separately?
Fasteners are in the box: #10 x 3/4 inch sheet metal screws ship with the 178SDKB. There is also a fast attach tape option (FATT) if you want a taped application instead of, or alongside, screwing it off. Nothing else is required to mount it to the door face.
9) Can this astragal handle a boiler room or freezer door where temperatures swing hard?
Temperature range on the silicone seal is -100 F to 500 F, and it keeps its flexibility at both ends of that. Synthetic rubber polymer siloxane also resists ozone, UV, and aging, so exterior sun-exposed pairs and mechanical spaces are both within what the 178SDKB is built for.
10) Silicone seal or brush sweep astragal, which should I use for a double door?
A silicone bulb seal, like the one on the NGP 178SDKB, compresses against the mating leaf and gives you the tighter close for smoke, air, and clean-agent containment. A pile brush insert, like the Pemko 300 Series self-adjusting brush astragal or the Pemko 369, drags less and forgives a door pair that is out of alignment, but it does not seal as positively. Pick the silicone when the room has to hold something in; pick brush when the pair moves a lot and alignment is imperfect.
11) Is an overlapping astragal like this a good choice where both leaves of the pair get used all day?
Not the strongest fit. Because the 178SDKB laps over the meeting stile, the leaves have to close in sequence, and high-traffic pairs where both leaves swing constantly tend to get the astragal caught. For a pair like that, look at an adjustable brush type such as the Pemko 300 Series, or a split astragal like the Pemko 369 with a half on each leaf. Save the overlapping silicone type for the inactive-leaf pairs and for rooms where the seal quality is the point.
12) Is a T-astragal the same thing as the NGP 178SDKB overlapping astragal?
They solve the same problem differently. A T-astragal, like the Cal-Royal EAST-501 aluminum T-astragal with vinyl insert, sets into or against the meeting stile with a T profile carrying the seal between the leaves. The NGP 178SDKB is an overlapping type that laps over the adjacent leaf face with a silicone seal. The overlap gives more coverage over the gap; the T profile keeps a lower projection off the door face.
13) Which astragal suits a meeting stile where the gap between leaves is inconsistent?
Where the leaves have gone out of alignment and the gap varies top to bottom, the Pemko 300 Series is an adjustable astragal with a self-adjusting pile brush, and the Pemko 369 split astragal carries a pile brush insert - brush accommodates a changing gap by sweeping. The NGP 178SDKB seals with a synthetic rubber polymer siloxane element on an aluminum 6063, T5 carrier and overlaps the pair, which suits an opening whose leaves close consistently and which needs the -100 F to 500 F range and resistance to ozone, UV and aging. On a rehab pair with a wandering gap, the brush-insert products contact more reliably.
14) For a pair of doors in a room protected by an FM200 or Halon system, which astragal is the right specification?
The NGP 178SDKB is recommended for areas using FM200 or Halon fire suppression systems, with flame-resistant and moisture-resistant properties, a silicone seal holding from -100 F to 500 F, and BHMA certification to ANSI/BHMA A156.22 heat and cold performance tests. Among the alternatives, the Pemko 369 split astragal seal with pile brush insert is fire-rated. Suppression rooms depend on the pair holding agent concentration, so the seal material and the certification behind it are the deciding specs rather than the astragal profile.
15) Will a dark bronze astragal match the anodized aluminum storefront doors I already have?
The 178SDKB carries a dark bronze aluminum finish, which is the usual companion to dark bronze anodized storefront and entrance framing. If your openings are clear anodized or painted a different color, this piece will read as a contrasting line down the meeting stile, since dark bronze is the only finish offered on the 178SDKB.
16) What is the NGP 178SDKB made of and will it hold up on an exterior opening?
Frame is aluminum alloy 6063 in T5 temper, the standard architectural extrusion alloy, paired with a siloxane synthetic rubber seal. The seal is rated for ozone, UV, and aging resistance, which is what governs whether a gasket survives outdoors. That combination is what NGP builds the 178SDKB around for commercial exterior and interior pairs alike.
17) I am standardizing gasketing across a hospital or school. Does this astragal work for that kind of facility?
Yes. The 178SDKB is a commercial-duty astragal, and NGP lists healthcare and educational facilities among its applications along with offices, retail, industrial and warehouse buildings, multi-tenant residential, and government work. Its BHMA certification to ANSI/BHMA A156.22 is what lets it carry through a facility-wide hardware standard.
How fast can I get the NGP 178SDKB-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 178SDKB-36 come with a warranty?
Absolutely. The NGP 178SDKB-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 178SDKB-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
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