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1486928-W2-A
19. The position of the shower and shower fittings must provide a minimum gap of 25
mm between the showerhead and the spill over level of any bath, shower tray or
basin and a minimum gap of 30 mm between the showerhead and the spill over
level of any toilet, bidet or other appliance with a Fluid Category 5 backflow risk.
Note: There will be occasions when the hose retaining ring will not provide
a suitable solution for Fluid Category 3 installations, in these instances
an outlet double check valve must be fitted, this will increase the required
supply pressure typically by 10kPa (0.1 bar). Double check valves fitted in
the inlet supply to the appliance cause a pressure build up, which affect
the maximum static inlet pressure for the appliance and must not be fitted.
For Fluid category 5 double check valves are not suitable.
Zone of
Backflow Risk
30 mm
Minimum
Toilet or Bidet
FC5
Hand Basin
FC3
Bath or Shower
Tray FC3
Electric
Shower
25 mm
Minimum
25 mm Minimum
Hose retaining ring fitted and shower fittings fixed at a suitable height
preventing dirty water backflow.
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