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Pemko 355 T Overlapping Astragal with Silicone Insert
The Pemko 355 T is an aluminum overlapping astragal with an integrated silicone insert, rated UL10C positive pressure and listed under Underwriters Laboratory 4L10. It is air infiltration tested and meets NFPA 80 requirements for pairs of fire doors. Available in Clear Anodized and Dark Bronze Anodized aluminum finishes in lengths from 80" to 108". Covered by a 5-year warranty.
Specifications
- Model: 355
- Profile Dimensions: W: 1-3/4", H: 1/8"
- Material: Aluminum
- Finishes: Clear Anodized Aluminum, Dark Bronze Anodized Aluminum
- Lengths: 80", 84", 96", 108"
- UL Listing: UL10C Positive Pressure Fire Rated, Underwriters Laboratory 4L10, Air Infiltration Tested
- Code Compliance: NFPA 80 (fire door pairs)
- Application: Commercial
- Warranty: 5 Year
Installation Note
When installing pairs of fire doors, care must be taken to maintain the requirements of NFPA 80. Consult the Pemko/Markar Full Line Catalog for installation details.
Manufacturer Resources
Pemko/Markar Products Full Line Catalog
Product Specs
- Features:
- When Installing Pairs of Fire Doors Care Must be Taken to Maintain the Requirements of NFPA 80
- Warranty:
- 5 Year
- Product Group:
- Door Trim and Accessories
- Product Subgroup:
- Astragals, Gaskets and Weatherstripping
- Product Type:
- Astragals
- Subcategory:
- Astragals
- Commercial/Residential:
- Commercial
- UL Listing Type:
- Air Infiltration Tested, Fire Rated- UL10C- Positive Pressure, Underwriters Laboratory 4L10
- Product Model:
- 355
- Product Dimension:
- W: 1-3/4", H: 1/8"
- Product Category:
- Door Trim and Accessories
- Product Substrate:
- Aluminum
- Department:
- Door Hardware
Pemko 355CS84 – Frequently Asked Questions
1) Can the Pemko 355 astragal be used on a labeled pair of fire doors?
Yes. The Pemko 355 T overlapping astragal is fire rated under UL10C for positive pressure and carries an Underwriters Laboratory 4L10 listing, and it is air infiltration tested. Pemko's own caution on the part is that when installing pairs of fire doors, care must be taken to maintain the requirements of NFPA 80, so the astragal still has to be applied in a way that keeps the pair consistent with the door assembly's label. It is a commercial part, aluminum, with a silicone insert doing the sealing at the meeting edge.
2) Can a Trimco 5001 or 5002 lock astragal replace a Pemko 355 T?
No, they solve different problems even though both are called astragals. The Trimco 5001 and 5002 are stainless steel lock astragals intended for use with locks, the 5001 with mortise or cylindrical locks and the 5002 with cylindrical locks at 1-9/16 inches by 6 inches. A 6 inch piece is a short section handling the lock area of the stile. The Pemko 355 T is a full-height overlapping T-astragal, 1-3/4 inches wide by 1/8 inch high, ordered in 80, 84, 96, and 108 inch lengths to run the height of the meeting stile, with a silicone insert and a Fire Rated UL10C Positive Pressure listing. If you are closing the gap and sealing the full joint on a pair, you need the 355 T; the Trimco pieces are what you order when the requirement is at the lock itself.
3) The drawing calls for a steel astragal on a fire door pair instead of aluminum. What do I use?
Use the NGP 139SP, a steel fire-rated door astragal with 3/4 inch overlap coverage. The Pemko 355 T covers the same fire-rated pair application but is built on an aluminum substrate with a silicone insert and is listed Fire Rated UL10C Positive Pressure, so when a specification names steel rather than aluminum for the meeting stile, the 139SP is the substitution to make. Either way, when installing pairs of fire doors care must be taken to maintain the requirements of NFPA 80, so confirm the astragal you order is compatible with the door manufacturer's listing for that opening.
4) What is the closest equivalent to a Pemko 355 T overlapping astragal for a pair of doors?
The Cal-Royal EAST-501 is the nearest match in profile and construction: an aluminum T-astragal with a vinyl insert made for double doors, which is the same overlapping T arrangement the Pemko 355 T uses on the meeting stiles of a pair. The difference that matters when you are matching a spec is the elastomer. The 355 T carries a silicone insert and an aluminum body measuring 1-3/4 inches wide by 1/8 inch high, and it is listed Fire Rated UL10C Positive Pressure, Air Infiltration Tested and Underwriters Laboratory 4L10. The EAST-501 is described as an aluminum T-astragal with a vinyl insert. If the opening is a fire door pair and the submittal calls for a UL10C positive pressure astragal, the 355 T is the one that answers that line; if the opening is a non-rated pair and you simply need a T-astragal with a flexible seal, the EAST-501 covers the same geometry.
5) How far does the Pemko 355 overlapping astragal stand off the door face, and how wide is the section that covers the gap?
The extruded profile is 1-3/4 inches wide by 1/8 inch high. The 1-3/4 inch width is what spans the meeting stiles of the pair and closes the gap between leaves; the 1/8 inch height is how little the section stands proud, which is what you check against pull hardware, exit device end caps, and anything else mounted near the meeting edge.
6) Silicone, vinyl or neoprene insert on an overlapping astragal, which one should I be buying?
The Pemko 355 uses a silicone insert. Among the other overlapping astragals stocked, the Cal-Royal EAST-501 is an aluminum T astragal with a vinyl insert for double doors, and the NGP 109N is an overlapping astragal with a neoprene seal in an 84 inch length. The deciding factor is usually the opening rather than the insert material: the 355 is the one with UL10C positive pressure fire rating and UL 4L10 listing stated, so on a labeled fire pair that is the one to specify.
7) I just need a plain metal astragal for a pair of doors without a seal strip. What is the simpler option?
Two simpler bare-metal choices exist. The NGP 139A is a solid metal astragal in anodized aluminum construction, and the NGP 176A 84 is an overlapping astragal in anodized aluminum supplied at 84 inches. Both give you the overlap at the meeting stile without a flexible insert. The Pemko 355 T is the version with sealing built in: aluminum with a silicone insert and Air Infiltration Tested listing, which is what you want when the pair has to control air movement across the joint. For a stock room, corridor, or utility pair where the astragal is there to close the gap and back up the strike rather than to seal it, the 139A or 176A 84 does the mechanical job with less to specify.
8) I only need to cover the gap between a pair of doors, no seal. Is there a plainer astragal than the Pemko 355?
If there is no sealing or fire requirement on the opening, a plain metal section does the job. The NGP 139A is a solid metal astragal in anodized aluminum, and the NGP 176A 84 is an overlapping astragal in anodized aluminum at 84 inches. The Pemko 355 is the one to keep when the pair is a labeled fire assembly or when you want the air infiltration tested silicone seal at the meeting edge rather than bare metal against the leaf.
9) Will a Pemko 355 astragal stop the draft coming through the gap between our corridor door pairs?
That gap is exactly what it is built for. The 355 is an overlapping astragal, so the 1-3/4 inch wide section bridges the meeting stiles, and the silicone insert makes the flexible contact between the two leaves. It is air infiltration tested, which is the test that speaks to draft and air movement through the pair. Aluminum construction, so it holds up in a commercial corridor without rusting.
10) Does the Pemko 355 come in dark bronze to match our anodized storefront doors, and is it available in every length?
Two finishes are offered on the 355: clear anodized aluminum and dark bronze anodized aluminum. Both come in all four lengths, 80, 84, 96 and 108 inches, so the finish choice does not limit the door height you can cover. If your openings need a painted or plated finish to match, this astragal is anodized aluminum only.
11) How many astragals do I need per pair of doors?
One. An overlapping astragal like the Pemko 355 is applied to a single leaf and laps across the gap onto the other one, so a pair takes one piece, ordered in the length that matches the leaf height (80, 84, 96 or 108 inches) and the finish you want. Buying two for one pair is a common ordering mistake on double door jobs.
12) I need the astragal to match dark bronze hardware on the rest of the building. What are my options?
The Pemko 355 T is offered in dark bronze anodized aluminum as well as clear anodized aluminum, in 80, 84, 96, and 108 inch lengths, so a bronze opening can be matched without a field finish. Among the alternatives, the NGP 139A and the NGP 176A 84 are anodized aluminum, and the Trimco 5001 and 5002 lock astragals are stainless steel. For a property manager standardizing a fleet of pairs, the 355 T in dark bronze keeps the meeting stile consistent with bronze anodized frames and trim while still carrying its Fire Rated UL10C Positive Pressure listing.
13) Trimco 5001 versus 5002 lock astragal, which one works with a mortise lock?
The Trimco 5001 is the stainless steel lock astragal listed for use with mortise or cylindrical locks. The Trimco 5002 is stainless steel at 1-9/16 inches by 6 inches and is listed for use with cylindrical locks. If the active leaf carries a mortise lock, the 5001 is the one to order; if it is a cylindrical lockset, either applies and the 5002 gives you the 1-9/16 by 6 inch piece. Neither takes the place of a full-height overlapping T-astragal such as the Pemko 355 T on the meeting stile of a pair.
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Does the Pemko 355CS84 come with a warranty?
Absolutely. The Pemko 355CS84 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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