Roof vent

Abstract

A roof vent for ventilation of a roof, the roof vent adapted to be placed on the pitch of the roof, not the ridgeline. The roof vent has a flat or tabular floor and a base attached to the floor. The floor includes a throat member having vertical walls and the base has sloped back lower walls, and upper walls that are non-horizontal and slope back from the lower walls, and finally a horizontal top. The effect of the nonnormal lower walls and the sloped back upper walls, in conjunction with a typically rectangular flat (parallel to the floor) top provides an airfoil shape to the roof vent that assists in the flow of an over the roof vent.

1 . A roof vent comprising:
 a cover having walls, including lower walls, each of the lower walls having a longitudinal axis, the lower walls comprising a pair of non-normal, opposed, substantially closed walls and a pair of non-normal, opposed, spaced apart walls, having mouth openings;
 wherein the cover walls of the cover include a non-horizontal upper wall angled back from each lower wall, each upper wall including a grid work portion, the grid work portion with a multiplicity of ribs arranged with their longitudinal axes parallel to the longitudinal axis of the lower wall; and 
   a base for engaging the lower walls, the base having a perimeter portion and a floor portion, the floor portion inside the junction between the lower walls and the base, the floor portion for defining, in part, a vent opening, the vent opening having generally vertical walls defining a throat terminating at an upper lip.   
     
     
         2 . The roof vent of  claim 1 , wherein the cover includes a top wall, the top wall substantially parallel to the floor. 
     
     
         3 . The roof vent of  claim 1 , wherein the lower walls make an angle of between about 9 and 15 degrees with an axis perpendicular with respect to the floor and wherein the upper walls make an angle of between about 55 and 65 degrees with respect to an axis perpendicular to the floor. 
     
     
         4 . The roof vent of  claim 1 , wherein the cover includes a closed top wall, the top wall substantially parallel to the floor and wherein the upper walls include a closed portion above the grid work portion. 
     
     
         5 . The roof vent of  claim 1 , wherein the grid work portion includes support struts running generally perpendicular to the ribs. 
     
     
         6 . The roof vent of  claim 1 , wherein the ribs are generally parallelogram shaped, having a top wall, a pair of spaced apart side walls, and a bottom wall. 
     
     
         7 . The roof vent of  claim 1 , wherein the ribs are staggered such that the top wall of the lower rib is above the bottom wall of the adjacent, higher rib. 
     
     
         8 . The roof vent of  claim 1 , wherein the ribs are generally tabular, having a top wall, a pair of spaced apart side walls, and a bottom wall and wherein the ribs are staggered such that the top wall of the lower rib is above the bottom wall of the adjacent, higher rib. 
     
     
         9 . The roof vent of  claim 1 , wherein the throat is within and spaced apart from a removed edge of the grid work portion such that precipitation entering the grid work portion will not enter the throat. 
     
     
         10 . The roof vent of  claim 1 , wherein the lower walls having mouth openings are shorter than the substantially closed lower walls. 
     
     
         11 . The roof vent of  claim 1 , wherein the lower walls having mouth openings are longer than the substantially closed lower walls. 
     
     
         12 . The roof vent of  claim 1 , wherein the cover and base are rectangular. 
     
     
         13 . A roof vent comprising:
 a rectangular cover having walls, including lower walls, each of the lower walls having a longitudinal axis, the lower walls comprising a pair of airfoil shaped, opposed, substantially closed walls and a pair of airfoil shaped, opposed, spaced apart walls, having mouth openings;
 wherein the cover walls of the rectangular cover include an upper wall angled back from each lower wall, each upper wall including a grid work portion, the grid work portion with a multiplicity of upstanding ribs arranged with their longitudinal axes parallel to the longitudinal axis of the lower wall; and 
   a base for engaging the lower walls, the base having a perimeter portion and a floor portion, the floor portion inside the junction between the lower walls and the base, the floor portion for defining, in part, a vent opening, the vent opening having generally vertical walls defining a throat and terminating in a critter guard, the critter guard adapted to allow air to flow therethrough;
 wherein the throat is within and spaced apart from a removed edge of the grid work portion such that precipitation entering the grid work portion will not enter the throat; 
 wherein the ribs are generally parallelogram shaped, having a top wall, a pair of spaced apart side walls, and a bottom wall and wherein the ribs are staggered such that the top wall of the lower rib is above the bottom wall of the adjacent, higher rib; and 
 wherein the cover includes a top wall, the top wall substantially parallel to the floor; wherein the lower walls make an angle of between about 9 and 15 degrees with an axis perpendicular with respect to the floor and wherein the upper walls make an angle of between about 55 and 65 degrees with respect to an axis perpendicular to the floor; wherein the cover includes a closed top wall, the top wall substantially parallel to the floor and wherein the upper walls include a closed portion above the grid work portion; and wherein the grid work portion includes support struts running generally perpendicular to the ribs. 
   
     
     
         14 . A roof vent comprising:
 a cover having walls, including lower walls, some substantially closed and some having mouth openings; and   a base for engaging the cover walls, the base having a perimeter portion and a floor portion, the floor portion inside the junction between the cover walls and the base, the floor portion for defining, in part, a vent opening, the vent opening having generally vertical walls defining a throat terminating in a critter guard, the critter guard having waffled walls adapted to allow air to flow therethrough;   the throat is within and spaced apart from a removed edge of the grid work portion such that precipitation entering the grid work portion will not enter the throat.   
     
     
         15 . The roof vent of  claim 14 , wherein the cover is rectangular and wherein the lower walls include a pair that has mouth openings and a pair that is substantially closed. 
     
     
         16 . The roof vent of  claim 14 , wherein the cover includes a top wall, the top wall substantially parallel to the floor. 
     
     
         17 . The roof vent of  claim 14 , wherein the lower walls of the cover make an angle of between about 9 and 15 degrees with an axis perpendicular with respect to the floor and further including upper walls which make an angle of between about 55 and 65 degrees with respect to an axis perpendicular to the floor. 
     
     
         18 . The roof vent of  claim 14 , wherein the cover further includes walls defining a grid work portion having ribs and support struts running generally perpendicular to the ribs. 
     
     
         19 . A roof vent comprising:
 a rectangular cover having walls, including lower walls, each of the lower walls having a longitudinal axis, the lower walls comprising a pair of airfoil shaped, opposed, substantially closed walls and a pair of airfoil shaped, opposed, spaced apart walls, having mouth openings;
 wherein the cover walls of the rectangular cover include a non-horizontal upper wall angled back from each lower wall, each upper wall including a grid work portion, the grid work portion with a multiplicity of ribs; and 
   a base for engaging the lower walls, the base having a perimeter portion and a floor portion, the floor portion inside the junction between the lower walls and the base, the floor portion for defining, in part, a vent opening, the vent opening having generally vertical walls defining a throat;
 wherein the cover includes a top wall, the top wall substantially parallel to the floor. 
   
     
     
         20 . The roof vent of  claim 19 , wherein the lower walls make an angle of between about 9 and 15 degrees with an axis perpendicular with respect to the floor and wherein the upper walls make an angle of between about 55 and 65 degrees with respect to an axis perpendicular to the floor. 
     
     
         21 . The roof vent of  claim 19 , wherein the cover includes a closed top wall, the top wall substantially parallel to the floor and wherein the upper walls include a closed portion above the grid work portion. 
     
     
         22 . The roof vent of  claim 19 , wherein the grid work portion includes support struts running generally perpendicular to the ribs. 
     
     
         23 . The roof vent of  claim 19 , wherein the cover includes a top wall, the top wall substantially parallel to the floor; wherein the lower walls make an angle of between about 9 and 15 degrees with an axis perpendicular with respect to the floor and wherein the upper walls make an angle of between about 55 and 65 degrees with respect to an axis perpendicular to the floor; wherein the cover includes a closed top wall, the top wall substantially parallel to the floor and wherein the upper walls include a closed portion above the grid work portion; and
 wherein the grid work portion includes support struts running generally perpendicular to the ribs.   
     
     
         24 . A static structure comprising:
 a pitched roof; and   a roof vent comprising a cover having walls, including lower walls, each of the lower walls having a longitudinal axis, the lower walls comprising a pair of non-normal, opposed, substantially closed walls and a pair of non-normal, opposed, spaced apart walls, having mouth openings;
 wherein the cover walls of the cover include a non-horizontal upper wall angled back from each lower wall, each upper wall including a grid work portion, the grid work portion with a multiplicity of ribs; and 
   a base for engaging the lower walls, the base having a perimeter portion and a floor portion, the floor portion inside the junction between the lower walls and the base, the floor portion for defining, in part, a vent opening, the vent opening having generally vertical walls defining a throat terminating at an upper lip;
 wherein the roof vent engages the pitched roof such that the pair of opposed, substantially closed walls are oriented up and down pitch.