VENTILATION OF HOUSE DRAINS WITH VENTILATING PIPES SHOULD BE PROVIDED WITH COWL VENTILATORS AT THE TOP.

Inspection chamber and a sort of man hole or chamber built in any house drainage system which takes wastes from the gully trap to cut off the house from direct communication with the drain and is an essential part of a house drainage, which is provided with a water seal and are used for the reception of waste water from sinks, baths laboratory basins, rain water and the surface water from paved yards, etc Ventilation of the house drains with a fresh air inlet can be provided at the lowest end of the drain preferably in the lower most inspection chamber and must fixed with the compound wall. The fresh air inlet pipe may be 100 mm in diameter and about three metre high above the ground level, fixed vertically with an enlarged square head or chamber at top with a mica flap valve which opens inwards only and allows in fresh air but does not allow the foul gases to escape out. In addition to this house must be provided with ventilation on every soil and the waste pipe coming out from every WC and bath room. These soil pipes are taken up at least 1.2 metre above the roof and which should be 4.6 meter higher than the highest window of any house with in the radius of fifteen metres. All such pipes should be provided with cowl Ventilators at the top. It is not favoured for the fixation of intercepting traps and require the house drains to be connected direct to the street sewers as it provides ventilation to street sewers through the house drains, as the intercepting traps are not properly flushed out and are thus of not much helping hand in ventilation of the house drains.