Reliable™ R3135 Horizontal Sidewall Sprinkler | Quick Response (QR) | 5.6K | Bronze | 212°F | Part No. GFRH2B
The Reliable™ Model GFR horizontal sidewall fire sprinkler (SIN R3135) is a quick response, standard spray sprinkler engineered for dependable fire protection in approved light and ordinary hazard applications where a wall-mounted sprinkler is required. Part number GFRH2B combines a 5.6 K-factor (80 metric) with a 212°F (100°C) temperature rating and a bronze finish, providing a durable, professional-looking option for exposed installations and environments where a traditional metallic appearance is preferred.
This horizontal sidewall sprinkler is designed to mount along walls or structural members and discharge water outward and downward in a quarter-spherical pattern, helping deliver coverage to the area below and in front of the sprinkler. When a fire raises the local ambient temperature to the sprinkler’s rated operating point, the heat-responsive glass bulb operates and releases the sealing assembly, allowing water to flow through the orifice and strike the deflector for fast, uniform distribution. Because it is quick response, this sprinkler is intended to react more rapidly to developing heat conditions than standard response sprinklers, supporting earlier water application where permitted by the system design criteria.
The GFRH2B installs using a 1/2 in. NPT connection and is intended for use in wet-pipe sprinkler systems when installed in accordance with applicable codes, NFPA standards, and the authority having jurisdiction. Proper spacing, placement, obstruction rules, and hydraulic design requirements must follow the governing standards and the sprinkler’s applicable listings/approvals, since sidewall sprinklers have specific installation limitations compared to pendent and upright styles. In finished spaces, the sidewall orientation can reduce the need for drops and help achieve a cleaner ceiling layout, while still providing effective discharge characteristics when correctly located.
To maintain performance and reliability, handle sprinklers carefully and keep them in original packaging until installation. Avoid impact to the glass bulb and frame, and do not install any sprinkler that has been dropped, shows visible damage, corrosion, leakage, or has been field-painted. During installation, use the manufacturer-recommended sprinkler wrench and apply only the torque necessary to achieve a leak-tight seal—over-tightening can damage threads or internal sealing surfaces. After installation, ensure the sprinkler and deflector remain free of dirt, grease, paint, or other contaminants that could interfere with discharge.
For ongoing system integrity, inspection and maintenance should follow NFPA 25 and local requirements, and any sprinkler that has operated or is suspected of damage should be replaced with the correct matching type, temperature rating, finish, and K-factor. The Reliable R3135 Model GFR horizontal sidewall sprinkler in the GFRH2B configuration offers a balanced combination of quick response activation, standard spray distribution, and practical sidewall mounting for projects that require dependable coverage with clean installation aesthetics.
