Abstract:
A housing includes side walls having a plurality of offset sections with air exit gaps defined between adjacent sections and a roof with an air exit gap defined therein. The housing also includes an air intake section and a door section. The air flow is balanced so sufficient air flows through the structure to maintain proper environmental conditions inside the structure while noise is contained within the structure. Acoustic panels are mounted on the structure to further absorb noise. The structure can be designed to be aesthetically pleasing as well. Lifting eyes as well as anchors can also be included and the structure can be either fabricated on site or elsewhere and shipped as needed.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to the general art of static structures, and to the particular field of gasoline engine housing structures. 
     2. Discussion of the Related Art 
     Many industrial operations require the use of gasoline engines. Drilling operations and the like are examples of such industrial operations. However, those skilled in the art will be able to envision many other such operations. 
     The engines used in such operations are often located outdoors. This presents several problems. Included among the problems is the exposure of the engine to the environment, which is especially difficult if the environment is harsh. Still other problems include the noise generated by the engine when it is in operation, which can create environmental issues with neighbors, especially in or near residential areas. Since an engine of this sort is not visually appealing, such engines may create problems associated with the aesthetics of such an engine. It is also noted that an exposed engine may be subject to vandalism. 
     Buildings presently used in industries, such as the gas exploration industry, are generally one-piece units with a screen wire opening on one end and openable doors on the other end. Such buildings cannot be totally closed during engine operation because such total closure may prevent air from flowing to the engine during engine operation thereby endangering the engine from overheating or even creating a danger of accumulated exhaust gases near the engine. Access to an engine in such buildings may be difficult and the building may not be amenable to accommodating various sizes of engines. 
     Still further, some presently available buildings are fabricated from metal which generally cannot be made aesthetically pleasing and may amplify noise associated with engine operation. 
     Still further, many presently available buildings are not easily moved from one site to another and may have to be transported from an assembly area to the site. This may create transportation issues. 
     PRINCIPAL OBJECTS OF THE INVENTION 
     It is a main object of the present invention to provide a housing for an engine, such as a gasoline engine. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that is easily constructed. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that will substantially reduce engine noise at neighboring locations while still permitting proper air flow to the engine. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that can be constructed at one location and easily transported to another location. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that can be constructed on site. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that can be made aesthetically pleasing. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that can protect the engine from environmental conditions. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that can protect the engine from vandalism. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that can protect the engine from unforseen problems associated with open air operation and exposure of the engine. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that can protect the engine while controlling emissions associated with the engine. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that can protect the engine while also controlling heat associated with engine operation. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that is amenable to a wide variety of engine sizes. 
     It is another object of the present invention to provide a housing for an engine, such as a gasoline engine, that will protect the engine while also permitting easy access to the engine. 
     SUMMARY OF THE INVENTION 
     These, and other, objects are achieved by a static structure for housing a gasoline engine which comprises a front end wall, a rear end wall, a loadable door in the front end wall, a shroud unit on the rear end wall, a roof, a first side wall, a second side wall, and a plurality of offset sections in both the first side wall and the second side wall. Each offset section of the plurality of offset sections is spaced apart from offset sections immediately adjacent thereto, and an air exit gap is defined between each offset section and the offset sections adjacent thereto. The air gaps are sized to permit air to flow out of the interior of the static structure but will keep most, if not all, of the noise associated with engine operation within the structure. The walls and roof of the structure can be painted and shaped to present a pleasing aesthetic appearance that blends with the area in which the structure is located. Siding and shingles can also be added if desired. 
     The structure further includes an air exit gap defined through the roof with the roof air gap being sized to cooperate with the exit air gaps in the walls to permit air flow and heat flow out of the structure while containing noise within the structure. Air flows into the structure via an air intake duct connected to the shroud unit. An acoustic panel is mounted on each offset section and a plurality of acoustic panels are mounted on the roof. The acoustic panels absorb noise and contain such noise in the structure. An inlet air gap is defined between the shroud unit and the rear wall, with the inlet air gap being fluidically connected to said air intake duct. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING FIGURES 
     FIG. 1 is a perspective view of the static structure embodying the present invention in a set up configuration. 
     FIG. 2 is a perspective view of the static structure embodying the present invention. 
     FIG. 3 is rear end elevational view of the static structure. 
     FIG. 4 is a top plan view of a portion of a side wall of the static structure embodying the present invention showing the offset portions thereof. 
     FIG. 5 is a side elevational view of the static structure of the present invention. 
     FIG. 6 is an end perspective view of the static structure of the present invention. 
     FIG. 7 is a top plan view of the static structure of the present invention. 
     FIG. 8 is a side perspective view of the static structure of the present invention. 
     FIG. 9 is a perspective view of an anchoring structure. 
     FIG. 10 is a perspective view of a shroud unit. 
     FIG. 11 is a side perspective view of the air intake duct of the structure of the present invention. 
     FIG. 12 is a front perspective view of the air intake duct. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Other objects, features and advantages of the invention will become apparent from a consideration of the following detailed description and the accompanying drawings. 
     The present invention is embodied in a static structure  10  for housing a gasoline engine broadly comprising a front end wall  12 , a rear end wall  14 , a first side wall  16 , a second side wall  18  and a roof  20 . In general, the structure is placed on ground G around a gasoline engine  22  (see FIG. 11) to cool that engine and the elements associated therewith while simultaneously abating the noise associated with operation of that engine. Structure  10  includes an air flow/noise abatement control system that permits just enough air to flow past the gasoline engine to keep it cool, but not so much air as to permit an undue amount of noise to escape from the structure. Structure  10  also protects the gasoline engine from the elements, especially if the engine is operating in very harsh environments. 
     More specifically, referring to FIGS. 2 and 7, it can be seen that front end wall  12  has an inside surface  30 , an outside surface  32 , a bottom edge  34  that is located on the ground when the front end wall is in a set-up configuration such as shown in FIGS. 1 and 2, and a top edge  36  spaced apart from the bottom edge. A longitudinal axis  38  extends between top edge  36  and bottom edge  34 . The front end wall further includes a first side edge  40 , a second side edge  42  and a transverse axis  44  which extends between first side edge  40  and second side edge  42 . A plurality of studs, such as stud  46 , are located on the inside surface  30  of the front end wall  12  and extend from the top edge  36  of the front end wall  12  to the bottom edge  34  of the front end wall  12 . The studs  46  are spaced apart from each other in the direction of the transverse axis  44  of the front end wall  12 . 
     A plurality of acoustic panels, such as acoustic panel  48 , are mounted on the inside surface  30  of the front end wall  12  between the studs  46  with each acoustic panel  48  being located between adjacent studs  46 . The front end wall  12  has a length dimension  50  extending in the direction of the longitudinal axis  38  from the top edge  36  to the bottom edge  34  of the front end wall  12  and a width dimension  52  extending in the direction of the transverse axis  44  from the first side edge  40  to the second side edge  42  of the front end wall  12 . 
     Double doors  54  are located on the front end wall  12  and include an inside surface  56  on each door of the double doors  54 , an outside surface  58  on each door of the double doors  54 , a lock  60  on the double doors  54 , and hinges, such as hinge  62 , connect each of the doors of the double doors  54  to the front end wall  12 . Acoustic panels, such as acoustic panel  64 , are located on each door of the double doors  54 . The doors swing out as indicated in FIG. 7 to permit a gasoline engine  22  to be moved into and out of the structure  10 . The double doors  54  provide sufficient space for most engines to move therethrough; however, if a very large engine is encountered, the entire structure  10  can be erected around the engine and then dismantled as necessary. One form of the doors includes double doors, each of which is six to seven feet in height, with an overall door opening being as much as seven feet wide to allow easy machinery access. The overall structure is, in one form of the invention, ten feet wide and twelve feet long. 
     As shown in FIGS. 3 and 7, structure  10  further includes the rear end wall  14 . Rear end wall  14  includes an inside surface  72 , an outside surface  74 , a bottom edge  76  that is located on the ground when the rear end wall  14  is in a set-up configuration, and a top edge  78  spaced apart from the bottom edge  76  of the rear end wall  14 . A longitudinal axis  80  extends between the top edge  78  of the rear end wall  14  and the bottom edge  76  of the rear end wall  14 . Rear end wall  14  further includes a first side edge  82  and a second side edge  84 . A transverse axis  86  extends between the first side edge  82  of the rear end wall  14  and the second side edge  84  of the rear end wall  14 . 
     A plurality of studs, such as stud  88 , are mounted on the inside surface  72  of the rear end wall  14  and extend from the top edge  78  of the rear end wall  14  to the bottom edge  76  of the rear end wall  14 . The studs  88  are spaced apart from each other in the direction of the transverse axis  86  of the rear end wall  14 . A plurality of acoustic panels, such as acoustic panel  90 , are mounted on the inside surface  72  of the rear end wall  14  between the studs  88  with each acoustic panel  90  being located between adjacent studs  88  on the rear end wall  14 . Rear end wall  14  further includes a length dimension  92  extending in the direction of the longitudinal axis  80  from the top edge  78  to the bottom edge  76  of the rear end wall  14 , and a width dimension  94  extends in the direction of the transverse axis  86  from the first side edge  82  of the rear end wall  14  to the second side edge  84  of the rear end wall  14 . 
     An opening  96  is defined through the rear end wall  14  and being defined by a bottom edge  98 , a first side  100  spaced from the first side edge  82  of the rear end wall  14  in the direction of the transverse axis  86  of the rear end wall  14 , a second side  102  spaced from the second side edge  84  of the rear end wall  14  in the direction of the transverse axis  86  of the rear end wall  14 , a top edge  104  which extends in the direction of the transverse axis  86  of the rear end wall  14  between the first side  100  of the opening  96  and the second side  102  of the opening  96  and is spaced apart from the top edge  78  of the rear end wall  14  in the direction of the longitudinal axis  80  of the rear end wall  14 . The opening  96  further includes a width dimension  105  which extends between the first side  100  of the opening  96  and the second side  102  of the opening  96  in the. direction of the transverse axis  86  of the rear end wall  14 , and a length dimension  106  (see FIG. 11) which extends between the top edge  104  of the opening  96  and the bottom edge  98  of the opening  96 ,in the direction of the longitudinal axis  80  of the rear end wall  14 . 
     Structure  10  further includes a shroud unit  110  on the rear end wall  14  which includes a front wall  112  spaced apart from the outside surface  74  of the rear end wall  14 . The front wall  112  includes an inside surface  114  which is spaced apart from the outside surface  74  of the rear end wall  14 , a first side edge  116  which is spaced apart from the first side  100  of the opening  96  in the rear end wall  14 , a second side edge  118  which is spaced apart from the second side  102  of the opening  96  in the rear end wall  14 . A transverse axis  120  extends between the first side edge  116  of the front wall  112  of the shroud unit  110  and the second side edge  118  of the shroud unit  110 . The front wall  112  of the shroud unit  110  further includes a top edge  122  which is spaced apart from the top edge  104  of the opening  96  of the rear end wall  14  and spaced apart from the outside surface  74  of the rear end wall  14 , and a bottom edge  124  that is spaced apart from the ground when the shroud unit  110  is in the set-up configuration and is spaced apart from the bottom edge  76  of the rear end wall  14 . The front wall  112  further includes a longitudinal axis  126  extending between the top edge  122  of the front wall  112  of the shroud unit  110  and the bottom edge  124  of the front wall  112  of the shroud unit  110  and a width dimension  130  measured in the direction of the transverse axis  120  of the front wall  112  of the shroud unit  110 . The width dimension of the front wall  112  of the shroud unit  110  is greater than the width dimension of the opening  96  in the rear end wall  14 . The front wall  112  of the shroud unit  110  further includes a length dimension  132  measured in the direction of the longitudinal axis  126  of the front wall  112  of the shroud unit  110 , and the length dimension of the front wall  112  of the shroud unit  110  is less than the length dimension of the opening  96  in the rear end wall  14 . 
     The relative dimensions of the front wall  112  of the shroud unit  110  and the opening  96  in the rear wall of the structure  10  creates a first air intake gap  140  between the first side edge  116  of the front wall  112  of the shroud unit  110  and the first side  100  of the opening  96  in the rear end wall  14  and a second air intake gap  142  defined between the second side edge  118  of the front wall  112  of the shroud unit  110  and the second side  102  of the opening  96  in the rear end wall  14 . 
     The shroud unit  110  further includes a top wall  144  connecting the top edge  122  of the front wall  112  of the shroud unit  110  to the outside surface  74  of the rear end wall  14  adjacent to the top edge  104  of the opening  96  in the rear end wall  14 . Due to the relative dimensions of the opening  96  in the rear wall and the front wall  112  of the shroud unit  110 , the top wall  144  of the shroud unit  110  slopes toward the bottom edge  124  of the front wall  112  of the shroud unit  110 . 
     The shroud unit  110  further includes support struts, such as support strut  150 , on the front wall  112  of the shroud unit  110 . The preferred form of the structure  10  includes four support struts, one on each corner of the front wall  112 . Each support strut  150  includes a proximal end  152  fixed to the inside surface  114  of the front wall  112  of the shroud unit  110  and extends toward the rear end wall  14 . The support struts  150  converge toward each other from the proximal ends  152  and have distal ends, such as distal end  156  of strut  150 , which are spaced apart from the proximal ends  152  of the struts  150 . The support struts  150  are spaced apart from each other. The shroud unit  110  can be removed in some forms of the structure  10 . 
     An intake air duct unit  160  is located on the rear wall and includes a first duct unit side wall  162  having a proximal end  164  located adjacent to the rear end wall  14  and a distal end  166  spaced apart from the inside surface  72  of the rear end wall  14 . Duct unit  160  further includes a second duct unit side wall  168  having a proximal end  170  located adjacent to the rear end wall  14  and a distal end  171  spaced apart from the inside surface  72  of the rear end wall  14 . The shroud unit  110  further includes a shroud unit top wall  172  (FIG. 10) having a proximal end  174  located adjacent to the rear end wall  14  and a distal end  176  spaced apart from the rear end wall  14 . Duct unit  160  further includes a duct unit top wall  177  and a duct unit bottom wall  178 . Shroud unit  110  further includes a shroud unit bottom wall  180  having a proximal end  182  located adjacent to the rear end wall  14  and a distal end  184  spaced apart from the inside surface  72  of the rear end wall  14 . 
     As can be seen in FIGS. 7 and 12, first duct unit side wall  162 , second duct unit side wall  168 , duct unit top wall  177  and duct unit bottom wall  178  define an air intake duct opening  188  that is spaced apart from the inner surface  72  of the rear end wall  14 . An intake air path shown in FIG. 7 by dotted lines  190 , is defined between the first air intake gap  140  and the second air intake gap  142  of the shroud unit  110  and the air intake duct opening  188 . 
     An intake air fan  200  is shown in FIG.  7  and is located near the air intake duct opening  188  to be in fluid communication with the intake air path  190  of the shroud unit  110  to draw outside air through the air intake path  190  and onto a gasoline engine  22  or other such device that is housed in structure  10 . The fan  200  can be removably positioned within the structure  10  if desired. The structure  10  can also be formed of any suitable materials. 
     Referring to FIGS. 2,  4  and  7 , it can be seen that first side wall  16  of structure  10  extends between the front end wall  12  and the rear end wall  14 . First side wall  16  includes an inside surface  202 , an outside surface  204 , a bottom edge  206  that is located on the ground when the first side wall  16  is in a set-up configuration and a top edge  208  spaced apart from the bottom edge  206  of the first side wall  16 . A longitudinal axis  210  extends between the top edge  208  of the first side wall  16  and the bottom edge  206  of the first side wall  16 . Side wall  16  further includes a first side edge  212  and a second side edge  214 . A transverse axis  216  extends between the first side edge  212  of the first side wall  16  and the second side edge  214  of the first side wall  16 . 
     A plurality of studs, such as stud  220 , are located on the inside surface  202  of the first side wall  16  and extend from the top edge  208  of the first side wall  16  to the bottom edge  206  of the first side wall  16 . The studs  220  are spaced apart from each other along the transverse axis  216  of the first side wall  16 . First side wall  16  has a length dimension  222  extending in the direction of the longitudinal axis  210  of the first side wall  16  from the top edge  208  of the first side wall  16  to the bottom edge  206  of the first side wall  16  and a width dimension  224  extending in the direction of the transverse axis  216  of the first side wall  16  from the first side edge  212  of the first side wall  16  to the second side edge  214  of the first side wall  16 . The structure  10  further includes a first front corner  226  located between the first side edge  212  of the first side wall  16  and the first side edge  40  of the front end wall  12  and a first rear corner  228  located between the second side edge  214  of the first side wall  16  and the first side edge  82  of the rear end wall  14 . 
     As can be seen in FIGS. 4 and 7, structure  10  includes a plurality of offset sections in the first side wall  16 . Each offset section includes an inside surface  230 , outside surface  232  and two studs, such as studs  220 A and  220 B, on the inside surface  230  of each offset section. Each offset section further includes a first side edge  234  extending between the top edge  208  of the first side wall  16  and the bottom edge  206  of the first side wall  16  and a second side edge  236  extending between the top edge  208  of the first side wall  16  and the bottom edge  206  of the first side wall  16 , with the second side edge  236  of each offset section being spaced apart from the first side edge  234  of the offset section in the direction of the transverse axis  216  of the first side wall  16 . 
     As can be seen in FIGS. 4 and 7, the plurality of offset sections include a first corner section  240  located adjacent to first front corner  226  defined between the first side wall  16  and the front end wall  12 . First corner section  240  includes a first corner section first side edge  242  located at the first corner defined between the first side wall  16  and the front end wall  12  and a first corner section second side edge  244  spaced apart from the first corner section first side edge  242  in the direction of the transverse axis  216  of the first side wall  16 . The plurality of offset sections further include a second corner section  250  located adjacent to first rear corner  228  defined between the second side edge  214  of the first side wall  16  and the first side edge  82  of the rear end wall  14  and having a second corner section first side edge  252  located at the first rear corner defined between the first side wall  16  and the rear end wall  14  and a second corner section second side edge  254  spaced apart from the second corner section first side edge  252  in the direction of the transverse axis  216  of the first side wall  16 . As can be seen in FIG. 7, the outside surface of the first corner section  240  is positioned to be coplanar with the outside surface of the second corner section  250 . 
     The studs on the first corner section  240  and on the second corner section  250  have inside surfaces  256  that are spaced apart from the inside surface of the first corner section  240  and the second corner section  250 . A first corner section acoustic panel  258  is mounted on the inside surfaces of the studs on the first corner section  240  and a second corner section acoustic panel  260  is mounted on the inside surfaces of the studs on the second corner section  250 . 
     The plurality of offset sections further include a first intermediate offset section  262  positioned between the first corner section  240  and the second corner section  250 . First intermediate offset section  262  includes an inside surface  264 , an outside surface  266 , two studs  220 C and  220 D on the inside surface  264  of the first intermediate offset section  262 , a first intermediate offset section first side edge  268 , a first intermediate offset section second side edge  270  which is spaced apart from the first intermediate section first side edge  268  in the direction of the transverse axis  216  of the first side wall  16 , a first intermediate offset section top edge  272  that is coplanar with the top edge  208  of the first side wall  16  and a first intermediate offset section bottom edge (not visible in FIG. 7, and which is congruent with top edge  272 ) that is coplanar with the bottom edge  206  of the first side wall  16 . An acoustic panel  276  is mounted on the inside surface  264  of the first intermediate offset section  262  between the two studs of the first intermediate offset section  262 . 
     The plurality of offset sections further including a second intermediate offset section  280  positioned between the first corner section  240  and the second corner section  250 . Second intermediate offset section  280  includes an inside surface  282 , an outside surface  284 , and two studs  220 E and  220 F on the inside surface  282  of the second intermediate offset section  280 . Each of the two studs on the inside surface  282  of the second intermediate offset section  280  has an inside surface  286  that is spaced apart from the inside surface  282  of the second intermediate offset section  280 . Second intermediate offset section  280  further includes a second intermediate offset section first side edge  288 , a second intermediate offset section second side edge  290  spaced apart from the second intermediate section first side edge  288  in the direction of the transverse axis  216  of the first side wall  16 , a second intermediate section top edge  292  that is coplanar with the top edge  104  of the first side wall  16  and a second intermediate section bottom edge (not seen in FIG.  7  and congruent with top edge  292 ) that is coplanar with the bottom edge  206  of the first side wall  16 . An acoustic panel  294  is mounted on the inside surfaces  286  of the studs mounted on the inside surface  282  of the second intermediate offset section  280  and is spaced apart from the inside surface  282  of the second intermediate offset section  280 . The outside surface of the intermediate offset section  298  that is located adjacent to the first corner section  240  is spaced apart from the acoustic panel on the first corner section in the direction of the transverse axis  44  of the front end wall  12  and defines a first side wall exit air gap  300  between the intermediate offset section adjacent to the first corner section  240  and the first corner section  240 . The outside surface  266  of the first intermediate offset section  262  is spaced apart from the acoustic panel on the second corner section  250  to define a second side wall exit air gap  302  between the first intermediate offset section  262  and the second corner section  250 . The outside surface  284  of the second intermediate offset section  280  is coplanar with the outside surfaces of the first corner section  240  and the second corner section  250 . 
     The plurality of offset sections further include a third intermediate offset section  308  which is identical to the first intermediate offset section  262  and includes a first side edge  310  located near the first side edge  288  of the second intermediate offset section  280 . Outside surface  312  of the third intermediate offset section  308  is spaced apart from the acoustic panel  294  on the second intermediate offset section  280  defining a third side wall exit air gap  316  between the second intermediate offset section  280  and the third intermediate offset section  308 . The outside surface  312  of the third intermediate offset section  308  is coplanar with the outside surface  266  of the first intermediate offset section  262 . 
     As will be understood by those skilled in the art based on the teaching of the present disclosure, the offset sections of the side wall define a plurality of air exit gaps through which air from inside structure  10  flows as indicated by arrows, such as air exit flow arrow  320  in FIG.  7 . The exit air gaps are sized to permit free flow of air out of the structure  10  but to keep sound inside the structure  10 . A preferred exit air gap size is 1 ¾ inches. 
     Structure  10  further includes second side wall  18  extending between the front end wall  12  and the rear end wall  14 . Second side wall  18  is identical to the just-described first side wall  16  and has a plurality of offset panels and a plurality of exit air gaps defined between adjacent offset panels, with adjacent panels of the second side wall  18  being offset from each other in the direction of the transverse axis  44  of the front end wall  12 . Odd number panels have outside surfaces that are coplanar with each other and even number panels have outside surfaces that are coplanar with each other as just described in reference to side wall  16 . Further description of side wall  18  will not be presented, with the above description of side wall  16  being incorporated and referenced for such description. 
     As shown in FIGS. 2,  3 , and  5 , structure  10  further includes roof  20  on the top edge  36  of the front end wall  12  and the top edge  78  of the rear end wall  14 . Roof  20  includes a first roof section  340  which has an inside surface  342 , an outside surface  344 , a proximal end  346  fixed to the first side wall  16 , a distal end  348  spaced apart from the first side wall  16  in the direction of the transverse axis  44  of the front end wall  12  and a plurality of acoustic panels, such as acoustic panel  350  indicated in FIG. 5, mounted on the inside surface  342  of the first roof section  340 . Acoustic panels  350  are identical to the acoustic panels mounted on the walls of the structure. Roof  20  further includes a second roof section  360  having an inside surface  362 , an outside surface  364 , a proximal end  366  fixed to the second side wall  18  and a distal end  368  spaced apart from the second side wall  18  in the direction of the transverse axis  44  of the front end wall  16 . A plurality of acoustic panels, identical to the above-discussed acoustic panels, are mounted on the inside surface  362  of the second roof section  360 . The acoustic panels on the second roof section  360  are not shown in the interest of clarity of the figures. 
     The distal end  348  of the first roof section  340  is spaced apart from the distal end  368  of the second roof section  360  and a roof exit air gap  370  is defined between the two distal ends  348  and  368 . 
     A plurality of roof exit air gap covering walls cover the roof air gap  370  and include a front supporting end wall  374  on the top edge  36  of the front end wall  12 , a rear supporting end wall  376  on the top edge  78  of the rear end wall  14 , a first covering wall  378  extending from the front supporting end wall  374  to the rear supporting end wall  376  and spaced apart from the distal ends  348  and  368  of the first and second roof sections  340  and  360  and spaced apart from the outside surfaces  344  and  364  of the first and second roof sections  340  and  360 . The first covering wall  378  includes a distal end  380  and a proximal end  382 . The roof  20  further includes a second covering wall  384  extending from the front supporting end wall  374  to the rear supporting end wall  376  and spaced apart from the distal ends  348  and  368  of the first and second roof sections  340  and  360  and spaced apart from the outside surfaces  344  and  364  of the first and second roof sections  340  and  360 . The second covering wall  384  includes a distal end  386  and a proximal end  388  with the proximal end  388  of the second covering wall  384  engaging the proximal end  382  of the first covering wall  378 . As shown in FIGS. 3 and 6, a first roof exit air gap  390  is located between the first covering wall  378  and the outside surface  344  of the first roof section  340 . A second roof exit air gap  392  is located between the second covering wall  384  and the outside surface  364  of the second roof section  360 . The first and second roof exit air gaps  390  and  392  are sized to permit air flow from the inside of the structure  10  while reducing noise flow out of the structure  10 . The gaps  390  and  392  are sized and located to prevent moisture from flowing into the structure. 
     All of the offset sections are connected together by bolts or the like and screens can be placed over the gaps to prevent insects or birds or other undesirable objects from entering the structure  10  via the gaps. The acoustic panels can also be formed of fire retardant materials if desired. 
     Structure  10  can be moved in parts or as a whole from one site to another. In order to permit the structure  10  to be moved as a whole, structure  10  includes a plurality of lifting eyes, such as lifting eye  400  shown in FIGS.  6  and  8 , attached to the side walls. In the preferred form of the structure  10 , lifting eyes  400  are located on all four corners of the structure  10 . 
     In order to ensure secure set up of the structure  10 , structure  10  further includes a plurality of anchors, such as anchor  410  shown in FIG. 9 securely connecting the structure  10  to the ground. As shown in FIG. 9, each anchor  410  includes an earth anchor  412  embedded in the earth when in the set-up configuration of the anchor, a wall attachment element  414  attached to one of the first and second side walls  16  and  18  in the set-up configuration of the anchor and a tether  416  connecting the earth anchor  412  to the wall attachment element  414  in the set-up configuration of the anchor  410 . 
     It is understood that while certain forms of the present invention have been illustrated and described herein, it is not to be limited to the specific forms or arrangements of parts described and shown.