An optical element having stray light suppression structure includes a main body which is ring-shaped and defines an axial direction. The main body has an inner peripheral face and an outer peripheral face. The main body is for being arranged inside a lens mount. The main body has a first end and a second end along the axial direction and has plural stray light suppression structures on the inner peripheral face. The stray light suppression structures are spacedly arranged around the axial direction. A surface of each stray light suppression structure is non-coplanar with the inner peripheral face. Each stray light suppression structure has a third end closer to the first end and a fourth end closer to the second end. Each stray light suppression structure has an extension path at least partially nonoverlapping a line defined from the third end to the fourth end.

Devices and associated methods are provided for improving ventilation of insulation material and building construction and renovation. Specifically, the present disclosure includes devices and system(s) to achieve the ventilation of exterior walls and roofs. Components of the system(s) consider shut-down of the ventilation process when it is not necessary, such as in winter, and in the event of fire, where the prevention of vertical and horizontal fire spread is desired.

A ventilation screed with an upper attachment flange having a top portion and a bottom portion and at least one opening in the top portion; a drip edge protruding from the bottom portion and a return leg that protrudes back from the drip edge and extends beyond the bottom portion; a drainage cavity protrusion protruding from the bottom portion above the drip edge, wherein the drainage cavity protrusion has an L-shaped drainage trough portion having at least one drainage opening in a bottom portion and a substantially vertical portion with a top end and a bottom end in communication with the bottom portion, an upper ground portion in communication with the top end of the substantially vertical portion of the L-shaped drainage trough portion extending outward from the substantially vertical portion and a drainage cavity shroud extending substantially downward from the upper ground portion.

A ventilated structural panel comprising a first sheet, having a long axis defining a length and a perpendicular short axis defining a width, a plurality of spacing structural elements, fixedly attached to the first sheet such that the yield strength of the panel is greater than the individual yield strength of the first sheet, and the plurality of spacing structural elements being formed such that a plurality of unobstructed pathways are created for air to move from at least one edge of the panel to at least one of an opposite and an adjacent edge of the panel, wherein the first sheet is the only sheet in the panel.

There is provided a ventilating sill plate for elevating a wall portion from a receiving surface. The ventilating sill plate comprises at least one longitudinal base having a first and a second face opposite the first face extending along a longitudinal axis, the first and the second face extending laterally perpendicular to the longitudinal axis between a first and a second lateral side. A plurality of longitudinally spaced support legs extend away from the second face and define at least one ventilating channel extending from the first to the second lateral side of the at least one longitudinal base. A plurality of support pads project from the first face and collaborate for supporting the wall portion. A plurality of longitudinally spaced arms are shaped and sized to receive the wall portion therebetween.

A combination of an air vent for passing air through an opening of a wall around an enclosed area, to facilitate ventilation, and a cover readily installable on and removable from the air vent are disclosed. The air vent includes a peripheral flange surrounding a central opening and a screen fixed to the air vent and covering the central opening. The air vent may include fixed false louvers and may bear surface texturing for esthetics. The cover is dimensioned and configured to overlie the central opening and may be releasably held in place by opposed deflectable tabs formed integrally therewith. Each of the tabs has a projection configured to enter and occupy a corresponding hole in the air vent. The tabs may be deflected to remove the projections from their respective holes, thereby releasing the cover from the air vent.

A reusable drywall air injector is fashioned from durable, rigid material. A pointed tip for piercing drywall extends from a hollow cylinder around which is disposed a helical blade. A hollow hex section is connected between the hollow cylinder and a hollow nipple, the interiors of the cylinder, the hex section and the nipple interconnecting to form a path for compressed air. Embodiments of the injector further fashion the interior of the hollow cylinder with notches adapted to receive a driver head. The injector is inserted into drywall by driving the injector by means of a motorized drill or screwdriver engaging the injector either by deep well socket around the hex section or, in embodiments, by appropriate driver head engaging the cooperating notches in the hollow cylinder. After use, the injector may be removed from drywall for reuse by the same means operated in reverse.

A foundation venting device for use in a wall that is constructed with queen size bricks includes a pipe that is rectangularly shaped and is configured to be inserted by a first end into a hole that positioned in the wall. The pipe has a second end that is closed. A plurality of apertures that is positioned in the second end of the pipe is configured to vent a space behind the wall. A flange that is coupled to and extends substantially perpendicularly from a perimeter of the second end of the pipe is configured to cover a gap between the pipe and at least one of an upper course and a lower course of the queen-sized bricks that define the hole in the wall.