The Manthorpe G950 Weep Vent is used to drain lintels, cavity trays, and ventilate cavity walls. The product can be slotted between two bricks and mortared in place. By placing it behind the cavity, a ventilation or drainage point is provided without being intrusive. The vent has a baffled grille to prevent the ingress of driving rain and wind whilst incorporating an insect grille and drip lip. Despite its size, this grille is wide enough to prevent debris, paint, or water drops from blocking it. The Weep Vent should be placed at the furthest corner away from the finished roof line when used with the Manthorpe catchment trays. The Weep Vent should be spaced at no greater than 900mm centres to meet N.H.B.C guidelines, which state, ?weep holes are recommended to be sited at every 450mm maximum with at least two per opening above all windows and doors.