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Ventilation
2.6NI-wide·Technical Booklet N Drainage
To prevent the water seal from being broken by the pressures which may develop in the system a branch pipe should either be ventilated as described in paragraph 2.11 or constructed as described in par
drainageventilationBranch ventilating pipes
2.11NI-wide·Technical Booklet N Drainage
Subject to paragraph 2.12 a branch ventilating pipe should be connected to a branch pipe within 300 mm of the trap (see Diagram 2.4) and should be not less than 25 mm diameter or, where the length of
drainageventilationUnventilated branch pipes
2.12NI-wide·Technical Booklet N Drainage
A branch ventilating pipe should not be required if the length and slope of a branch pipe does not exceed the maximum dimensions and gradients for the relevant pipe diameters given in Diagram 2.5.
drainageventilationVentilation stacks - general requirements
2.13NI-wide·Technical Booklet N Drainage
A ventilation stack should provide ventilation to branch ventilation pipes and may also provide ventilation to underground foul drainage (see paragraph 3.5). The lower end of a ventilation stack may b
drainageventilationVentilation stack termination - external air
2.13(a)NI-wide·Technical Booklet N Drainage
The upper end of a ventilation stack should terminate in the external air at least 900 mm above any opening into a building within 3 m, with a cage or cover which does not restrict the air flow (see D
drainageventilationVentilation stack termination - air admittance valve
2.13(b)NI-wide·Technical Booklet N Drainage
The upper end of a ventilation stack should terminate with an air admittance valve which complies with BS EN 12056: Part 2 and BS EN 12380.
drainageventilationVentilation stack termination - connection to discharge stack
2.13(c)NI-wide·Technical Booklet N Drainage
The upper end of a ventilation stack should connect to a ventilated discharge stack above the "spillover" level of the highest appliance served.
drainageventilationVentilation of discharge stacks
2.15NI-wide·Technical Booklet N Drainage
A discharge stack (other than a stub stack complying with paragraph 2.16) should be ventilated. The diameter of the part of a stack above the highest branch pipe may be reduced to 75 mm where the stac
drainageventilationVentilation of drains and branch drains
3.5NI-wide·Technical Booklet N Drainage
The system should be ventilated at or near the head of a main drain, and a branch drain longer than 10 m. A ventilation stack (see paragraph 2.13) or, a ventilated discharge stack (see paragraph 2.15)
drainageventilation