Abstract: A water drainage system and water collector pan for use in unit masonry block walls includes a plurality of water collection pans which may be quickly placed on the top surface of the course of masonry block units over the length of a selected block wall course for collecting the water drained through the interior cavities of the upper courses and directing the water to the exterior of the wall. The collector pans includes a substantially planar collector surface, which, when installed on the block, extends from the front to the rear edges of the block, and generally vertical ridges surrounding the front, rear and side edges of the collector portion and extending to a height slightly less than the height of the bed joint between the blocks, and a weep spout extending outward from the collector surface over the portion of the block to be covered by the bed joint to provide an exit for the collected water from the interior of the wall.

Abstract: A roof ventilation system, especially for a conservatory roof, comprises a cowl (22) attachable to a ridge component of the roof and an electrically operated rotor (24) within the cowl.

Abstract: A screen device to prevent animal entry into weep holes of foundation walls is formed from flexible, polymeric materials such as nylon or other conventional plastics. The screen device includes a frame having inner and outer sections with a porous barrier therebetween. The method of installing the screen device over a foundation wall weep hole includes the step of sealing the edges of the outer frame section with a standard silicone sealant, and thereafter inserting a porous barrier into the outer frame section. The porous barrier is releasably held in place with an inner frame section which is lastly placed in and connected to the outer frame section.