Reliable™ RA1311 Standard Response (SR) Pendent Sprinkler | 2.8K | Brass | 286°F | Part No. F28P3BN
The Reliable™ Model F1-28 Pendent Fire Sprinkler (SIN RA1311) is a standard-response, standard-spray automatic sprinkler designed for dependable fire protection in light and ordinary hazard applications. This configuration—Part No. F28P3BN—features a 2.8 K-factor and a 286°F (141°C) 5.0 mm glass bulb heat element, paired with a natural brass finish that’s well-suited for exposed installations where a classic metallic appearance is preferred.
When ambient temperatures at the sprinkler reach its rated activation point, the glass bulb operates, releasing the seal and allowing water to discharge in a uniform standard spray pattern to help control fire spread and support code-compliant system performance. The RA1311 connects via 1/2" NPT threads (ISO 7-R1/2 optional) and is rated for a maximum working pressure of 175 psi (12 bar).
Important installation note (286°F models): 286°F (and higher) temperature-rated sprinklers are not listed for recessed use. Use exposed or surface-mounted configurations as required by the application and authority having jurisdiction.
Listings and approvals
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cULus Listed
Key specifications
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Model: Reliable F1-28
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Part number: F28P3BN
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SIN: RA1311
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Type: Pendent
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Response / Spray: Standard Response / Standard Spray
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K-Factor: 2.8 (40 metric)
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Temperature rating: 286°F (141°C), 5.0 mm glass bulb
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Thread connection: 1/2" NPT (ISO 7-R1/2 optional)
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Max working pressure: 175 psi (12 bar)
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Finish (this SKU): Brass
Finishes and temperature options
Available in Brass, Chrome, and White (polyester) finishes with temperature ratings of 155°F, 175°F, 200°F, and 286°F.
Accessories and care
Use the correct sprinkler wrench during installation to prevent damage and ensure proper fit. Avoid over-tightening, impact, or contamination of the sprinkler and glass bulb. Do not install any sprinkler that appears damaged, painted (non-factory), or compromised. Store sprinklers in a clean, dry environment and maintain systems in accordance with NFPA 25 and AHJ requirements.
