4.16 [RD205] [Residential Flat Concealed Sprinkler] [Cover Small].jpg 4.16 [RD205] [Residential Flat Concealed Sprinkler].jpg White 2 180dpi.jpg Hairline-Finish-Top.jpg Copper-Top.png golden-oak-2.jpg Cherry-Chestnut-Top1.jpg Dark-Walnut-1.jpg

RD205 Residential Flat Concealed Pendent Sprinkler

  • UL Logo Mid Grey 144.jpg
K factor 4.9
Response Quick Response
Maximum Working Pressure 12.1 bar (175 psi)
Link Fusible Link
Temperature Rating Sprinkler: 72°C (162°F)
Cover Plate: 60°C (140°F)
Cover Plate Size 60mm (2-3/8")
Vertical Adjustment 9.0 mm (3/8")
Finish White, Black, Chrome
Custom colours and wood grain available on request
Approvals UL Listed

The Model RD205 Residential Flat Concealed Sprinklers are automatic sprinklers of the compressed fusible solder type. These are decorative and fast response. The frame of the sprinkler hides the deflector, gasket, etc., which is in turn concealed above the ceiling by the cover plate assembly. The cover plate has a flat profile, and its diameter is extremely small at 60mm diameter. The push-on/thread-on, thread-off design of the concealed cover plate assembly allows easy installation of the cover plate. Therefore, the Model RD205 should be your first choice when aesthetics is the major consideration for ultimate appeal and unbeatable performance is desired. The Model RD205 is designed for the residential occupancies and it is perfect for use in homes, hotels and other living quarters. Model RD205 is to be used in wet pipe residential sprinkler systems for One and Two Family Dwellings and Manufactured Homes per NFPA 13D; wet pipe residential sprinkler systems for Residential Occupancies up to and Including Four Stories in Height per NFPA 13R; or, wet pipe sprinkler systems for the residential portions of any occupancies per NFPA 13. Model RD205 has a 4.9 (70.6 LPM √ / bar) K-factor that meets the required residential flow rates with minimal residual pressure, which allows for smaller pipe sizes and water supply requirements. For extended installation flexibility, the Model RD205 provides 3/8 inch (9.0mm) vertical adjustment. This adjustment in installation decreases the need for precise cutting of the pipe that drops to the sprinkler and allows for a perfect fit with a range of pipe lengths. The heat sensitivity and water distribution design of Model RD205 allows for an increased chance of residents’ escape or evacuation in case of fire. However, residential fire sprinkler systems are not a substitute for fire safety awareness or fire safety construction required by building codes.

Ease of Installation Due to the protective cap’s innovative design elements.
• The unique protective cap allows for the head to be installed without removing the cap, giving protection to head during the entire installation
• The tolerance limit to the ceiling level is clearly marked on the protective cap and small bumps are added to the head so it can be fastened with just the right tension.
• Installable with Cap on
• Cap has a custom opening for the socket to enabling seamless installation

Saves Time
• Saves two steps of removing and later reinserting the cap multiplied by the total number of sprinkler heads on the job.
• No more time spent tediously reinforcing protective caps to the heads with tape.
• No more time and money wasted on returning to a job site to secure flimsy caps if they have fallen off.
• Less time, less labour, and less room for error equals more profit for the contractor.

Safety Feature
• Rapidrop Sprinkler heads also provide a safety feature as the sprinkler’s deflector and delicate inner components are protected from the moment they are packaged at our manufacturing facility to when they are ready to be installed.

NFPA 13D and NFPA 13R Wet Pipe Hydraulic Design Criteria 

Maximum Coverage Area(a)
ft. x ft. (m x m)
Spacing (between the Sprinklers) Minimum Flow(b) and Residual Pressure
for Horizontal Ceiling
(Max. 2 inch Rise for 12 inch Run)
Maximum Minimum Flow Pressure
12 x 12 (3.7 x 3.7) 12 ft. (3.7m) 8 ft. (2.4m) 13 GPM (49.2 LPM)  7.0 psi (0.050 MPa)
14 x 14 (4.3 x 4.3) 14 ft. (4.3m) 8 ft. (2.4m) 14 GPM (53.0 LPM)  8.2 psi (0.057 MPa)
16 x 16 (4.9 x 4.9) 16 ft. (4.9m) 8 ft. (2.4m) 15 GPM (56.8 LPM)  9.4 psi (0.065 MPa)
18 x 18 (5.5 x 5.5) 18 ft. (5.5m) 8 ft. (2.4m) 19 GPM (71.9 LPM)  15.0 psi (0.103 MPa)

a) For coverage area dimensions less than the above mentioned, it needs to use the minimum required flow for the Next Higher Coverage Area listed.
b) Requirement is based on minimum flow in GPM/LPM from each sprinkler. The associated residual pressures are calculated using the nominal K-Factor. Refer to Hydraulic Design Criteria Section for details.