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An inlet device for the wall of a building for example an animal barn comprises a simple moulded rectangular body through which the air can pass having an open mouth at one end and an inlet surface in a lower downwardly facing surface on the outer side of the wall. A door on a front face of the hous

An inlet device for the wall of a building for example an animal barn comprises a simple moulded rectangular body through which the air can pass having an open mouth at one end and an inlet surface in a lower downwardly facing surface on the outer side of the wall. A door on a front face of the housing is hinged along a flange on the lower side of the housing as to hang down in the open condition. The door includes a foamed projection which can seal with a recess surrounding the open mouth of the housing. Inside the housing is provided a foamed plate-like shutter which is spring biassed into a closed position against flanges along the sides of the housing. The base of the shutter is freely mounted in a v-shaped area defined at a step above the lower surface of the housing to prevent freezing.

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An air inlet for mounting in a wall of a building comprising an integrally moulded plastics body defining a sleeve portion of rectangular cross-section having an upper wall, a lower wall and two side walls, one end of the sleeve portion defining a planar open mouth lying in a plane at right angle to

An air inlet for mounting in a wall of a building comprising an integrally moulded plastics body defining a sleeve portion of rectangular cross-section having an upper wall, a lower wall and two side walls, one end of the sleeve portion defining a planar open mouth lying in a plane at right angle to the length of the sleeve portion, a hooded inlet portion connected to an opposed end of the sleeve portion and having an upper cover surface extending through an angle of the order of 90 degrees, two sides and a lower open inlet surface arranged at right angles to said open mouth and covered by said sides and said cover surface, an abutment surface at said one end of the sleeve portion extending outwardly therefrom for engaging an inner surface of the wall with the sleeve portion extending through an opening in the wall, a door support flange extending outwardly from said sleeve portion at said open mouth, a door hingedly mounted on said door support flange for movement between a closed position closing said open mouth and an open position exposing said open mouth for passage of air through said inlet, air leakage sealing means coacting between said door and said sleeve portion at said open mouth in said closed position of the door, a pivotal shutter mounted within said sleeve portion comprising a planar rigid rectangular sheet member having a lower edge arranged adjacent one side of said inlet surface and inclined upwardly and longitudinally of said sleeve portion to an upper edge thereof adjacent said open mouth, means mounting said shutter for pivotal movement about said lower edge from the closed position extending across said sleeve portion to prevent the flow of air through said sleeve portion to an open position in which said shutter lies substantially flat along said lower wall of the sleeve portion, and spring means applying a biassing force to said shutter to maintain it in said closed position, each of said upper, lower and side walls of said sleeve portion having at said open mouth integrally moulded therewith a first outwardly extending flange wall and a recess wall generally parallel to the respective wall of the sleeve portion to define a recess surrounding the open mouth, an outer surface of said flange wall defining said abutment surface, an inner surface of said door having extending therefrom a sealing member arrangement to cooperate with an inner surface of said recess wall to define said air leakage sealing means.