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National Guard Products 120NSS Stainless Steel Neoprene Perimeter Weatherstrip — Head-and-Jamb Set
National Guard Products (NGP) model 120NSS is a stainless steel neoprene perimeter weatherstrip seal finished in a Brushed #4 Stainless Steel (US32D / 630) retainer with a black neoprene insert. Sold as a complete head-and-jamb set — one head piece and two jamb pieces — this made-to-order gasketing system is available in five standard opening sizes: 3'0 × 7'0, 4'0 × 7'0, 6'0 × 7'0, 6'0 × 8'0, and 8'0 × 8'0. The 120NSS is screw-applied directly to the frame stop and is engineered for demanding commercial and institutional openings that require certified fire-rated, positive-pressure, and smoke-and-draft-control performance.
120NSS Perimeter Seal — Key Features
- Type 304 Stainless Steel Retainer: Corrosion-resistant Type 304 stainless steel carrier with a Brushed #4 finish (US32D / 630) coordinates with premium commercial hardware finishes and holds up in high-humidity or exterior-adjacent applications.
- Advanced Elastomeric Foam Insert: The seal insert is a Synthetic EPDM Rubber in a Polypropylene Thermoplastic Matrix Closed Cell Advanced Elastomeric Foam, delivering very good abrasion resistance, tensile strength, and shape memory for consistent, long-term sealing performance.
- Extreme Temperature Range: Rated from −81 °F to 275 °F, the neoprene compound maintains its seal in cold-storage, industrial, and high-heat environments without cracking or compressing out.
- Flame-Resistant and Moisture-Resistant: The foam matrix is both flame-resistant and moisture-resistant, supporting compliance on fire-rated openings and resisting degradation in wet or high-humidity conditions.
- Ozone, Sunlight, and Aging Resistance: Good resistance to ozone, UV sunlight, and general aging helps maintain seal integrity over the life of the door opening.
- UL Certified — Standard and Positive Pressure Fire Ratings: Certified by UL to CAN/ULC-S104 and ANSI/UL10B and to ANSI/UL10C (Positive Pressure); complies with NFPA 80 and NFPA 252 for hollow metal fire doors rated up to 3 hours and wood fire doors rated up to 90 minutes.
- Smoke and Draft Control — UL Category 'H': Certified by UL to ANSI/UL10C and ANSI/UL1784 Category 'H'; complies with IBC and NFPA 105 for use on 'S'-labeled positive-pressure hollow metal fire doors up to 3 hours and wood fire doors up to 90 minutes.
- ANSI/BHMA A156.22 Certified: Certified gasketing listed in the BHMA Certified Products Directory, complying with the American National Standard for Door Gasketing and Edge Sealing Systems and performance tests for heat and cold.
- Air Infiltration Control: Recommended by NGP as a minimum air leakage product for a tight perimeter seal around the full door frame.
- Slotted Screw Holes for Field Adjustment: Screw holes are slotted to allow on-site positioning adjustments, and #6 × 3/4" Stainless Steel SMS screws are furnished with the set.
- Made to Order: Each set is manufactured to your specified opening size. Allow 10–15 business days lead time.
Technical Details
| Manufacturer | National Guard Products (NGP) |
| Model Number | 120NSS |
| Product Type | Perimeter Weatherstrip / Neoprene Seal — Head-and-Jamb Set |
| Finish | Brushed #4 Stainless Steel (US32D / 630) |
| Retainer Material | Type 304 Stainless Steel |
| Seal / Insert Material | Synthetic EPDM Rubber in Polypropylene Thermoplastic Matrix Closed Cell Advanced Elastomeric Foam |
| Insert Color | Black |
| Nominal Section Profile | 1-1/8" × 3/16" |
| Temperature Range | −81 °F to 275 °F |
| Flame Resistance | Yes |
| Moisture Resistance | Yes |
| Ozone / UV / Aging Resistance | Good |
| Abrasion Resistance / Tensile Strength / Memory | Very Good |
| Set Configuration | 1 Head + 2 Jambs (Head-and-Jamb Set) |
| Application Method | Screw-applied to frame stop |
| Furnished Fasteners | #6 × 3/4" Stainless Steel Sheet Metal Screws (SMS) |
| Screw Holes | Slotted for field adjustment |
| Available Opening Sizes | 3'0 × 7'0 / 4'0 × 7'0 / 6'0 × 7'0 / 6'0 × 8'0 / 8'0 × 8'0 |
| UL Fire Rating — Standard | CAN/ULC-S104 & ANSI/UL10B; NFPA 80 & NFPA 252; Hollow Metal up to 3 Hrs., Wood up to 90 min. |
| UL Fire Rating — Positive Pressure | ANSI/UL10C; IBC, NFPA 80 & NFPA 252; Hollow Metal up to 3 Hrs., Wood up to 90 min. |
| Smoke & Draft Control | UL Certified ANSI/UL10C & ANSI/UL1784 Category 'H'; IBC & NFPA 105; 'S'-labeled Positive Pressure HM up to 3 Hrs., Wood up to 90 min. |
| BHMA Certification | ANSI/BHMA A156.22 — Listed in BHMA Certified Products Directory; Heat and Cold Performance Tests |
| Availability | Made to Order — Allow 10–15 Business Days |
Pro Tip — Installation
The 120NSS mounts directly to the frame stop using the furnished stainless steel screws. Because the screw holes are slotted, installers can shift the retainer in or out to fine-tune seal compression against the door face before final tightening — a useful feature on hollow metal frames where stop dimensions vary slightly from frame to frame. Verify the correct opening size before ordering; as a made-to-order product with a 10–15 business day lead time, selecting the right size at the time of purchase is critical to keeping your project on schedule.
| Gasketing Set Size | 3'0 x 7'0 Set or 4'0 x 7'0 Set or 6'0 x 7'0 Set or 6'0 x 8'0 Set or 8'0 x 8'0 Set |
| Brand | National Guard Products |
| Housing Finish | Stainless Steel |
| Smoke Rated | Smoke Rated |
| Weatherstripping Type | Perimeter Gasketing |
| Housing Size | 1-1/8" x 3/16" |
| Insert Color | Black |
| Fasteners | #6 x 3/4" Stainless Steel SMS |
| Fire Rated | Fire Rated |
| Insert Material | Neoprene |
| Mounting Type | Screw Applied - Exp Screw, Surface Mounted |
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