7.5.5.

(1) Every sump or tank that receives sanitary sewage shall be provided with a vent pipe that is connected to the top of the sump or tank.

(1) Every oil interceptor shall be provided with 2 vent pipes that,

(a) connect to the interceptor at opposite ends,

(b) extend independently to open air,

(c) terminate not less than 2 000 mm above ground and at elevations differing by at least 300 mm, and

(d) do not connect to each other or any other vent pipe.

(2) Adjacent compartments within every oil interceptor shall be connected to each other by a vent opening.

(3) Where a secondary receiver for oil is installed in conjunction with an oil interceptor, it shall be vented in accordance with the manufacturer's recommendations, and the vent pipe shall,

(a) in no case be less than 1 ½ inch in size,

(b) extend independently to open air, and

(c) terminate not less than 2 000 mm above ground.

(4) The vent pipes referred to in Sentence (1) are permitted to be one size smaller than the largest connected drainage pipe but not less than 1 ¼ in. in size, or can be sized in accordance with the manufacturer's recommendations.

(5) Every vent pipe that serves an oil or grease interceptor and is located outside a building shall be not less than 3 in. in size in areas where it may be subject to frost closure.

(6) Every grease interceptor shall have a vent pipe that is not less than 1 ½ in. size connected to the outlet pipe, that connects to the plumbing venting system.

(7) A vent pipe shall be provided within 1 500 mm of the inlet to a grease interceptor complete with a cleanout to provide cleaning of the vent pipe.

(8) Where an acid waste dilution tank is installed, it shall be provided with a vent pipe connected at the top of the tank and that is sized in accordance with Article 7.5.7.7.

(1) Venting systems for drain piping or dilution tanks conveying corrosive waste shall extend independently and terminate in open air.

(1) Where a building trap is installed, a fresh air inlet not less than 4 in. in size shall be connected upstream and within 1 200 mm of the building trap and downstream of any other connection.

(1) Where provision is made for a fixture to be installed in the future, the drainage system and venting system shall be sized accordingly and provision made for the necessary future connections.

(2) Except as required in Sentence 7.5.7.7.(2), where a plumbing system is installed in a building, every storey in which plumbing is or may be installed, including the basement of a single family dwelling, shall have extended into it or passing through it a vent pipe that is at least 1 ½ in. in size for the provision of future connections.