"IMPROVEMENTS INTRODUCED IN THE ULTRA-COMPACT EXTRACTOR FAN FOR BATHROOMS" 10 The invention refers to a modification in essential portions of extractor fans of those used mainly at the bathrooms for the extraction of steams and humidities and as a consequence of it's final destination must comprise 15 a series of specific elements which, on the one hand prevent the damages produced by such humidity and steams and on the other hand do not allow the air entering from the outside to the inside of the room or bathroom where such are installed when said extractor fans are in an 20 idle situation. Furthermore and as a consequence of the design of such extractor fan being made for bathrooms, it's another object of the present invention the reduction of certain common elements in the extractor fans, such as the 25 connection's connector, the centralization of functions and general electric circuitry of the extractor fan. The improvements deal basically in the systems for closing the extractor fan's tunnel, when same is in the idle position, which object is that of avoiding, as a 30 consequence of the difference of temperatures between the outside and the interior, to give place to air draughts, as well as the protection of certain electric and electronic elements, also as well to the attachment system of the extractor fan to the vertical faces or any 35 other support element which is used in said room where it -2 is installed. The improved extractor fan incorporates as a system for shutting the tunnel a shutter to the exit of the air of the extractor fan installed in the interior of the 5 room, which in grace to the material out of which it's manufactured and to the attachment system of same allows that in the working position lets a free passage to the air extracted whilst when the extractor fan remains idle said shutter fully stops the entry of air from the 10 outside through the tunnel, avoiding in such a way that the installation of same have an effect on the conditioning of the room or bathroom itself where the extractor fan has been installed when it is not in use. In a parallel way there heve also been modified the 15 anchoring systems of the extractor fan to the vertical face or walls since it incorporates retention means which may be activated from the inside of the extractor fan and which avoid any type of displacement or vibration of the proposed extractor fan, being added said retention means 20 to the conventional screws with which the extractor fans that may be considered of the state of the art are provided in the corners of the extractor fan's support for binding same to said wall or vertical face. Finally, the proposed extractor fan concentrates all 25 the electric installation in a printed circuit board, and in order to avoid to same the undesired effects of the humidities or steam it is protected with the corresponding lid, further achieving a centralization of all the functions of the extractor fan in said printed 30 circuit board. Further details and features of the present Patent of Invention application will be manifest at the description that follows in which, in a rather schematic way, reference is made to the figures which in this 35 description represent the preferred details. These details are given as an example, with reference to a -3 possible practical embodiment, but it's not limited to the details explained herewith; therefore this description must be considered from an illustrative point of view and with no restrictions whatsoever. 5 There follows a report of the several elements numbered in the drawings joined to the present description; (10) extractor fan, (11) front lid, (12) window, (13) flaps, (14) support, (14.1) discharge tube, (15) corners, (16) holes, (17) screw, (18) hooks, (19) 10 motor, (20) fan, (21) paddles, (22) electronic circuit board, (23) protector, (24) sight, (25) diffusor, (26) passages, (27) directing paddles, (27.1) emerging zone, (27.2) depressed zone, (28) brackets, (29) shutter, (29.1) notches, (30) hinge, (31) connector, (32) screws, 15 (33) wire, (34) channels, (35) pin, (36) fringe, (37) recess. Figure 1 is an explosion perspective view of the essential elements and portions of the extractor fan (10). 20 Figure 2 is an elevation front view of the support (14) and of the elements installed on same. Figure 3 is an elevation front view of the rear portion of the support (14). Figure 4 es an upper plant view of the shutter (29). 25 In one of the preferred embodiments of what is the object of the present application and as can be seen in Figure 1, the extractor fan (10) is formed with a front lid (13) of a noticeably quadrangular shape in which central portion is provided a window (12), which in turn 30 is provided with flaps (13) horizontal and parallel among themselves. Said front lid (13) is attached with the help of the screw (17) on the support (14). The support (14) presents a body of a noticeably prismatic configuration, in which 35 front face is incorporated as above described the front lid (13) whilst at the rear face extends as per a -4 discharge tube (14.1) In the interior of the tunnel (14.1) is fitted the electric motor (19) duly attached to the central portion of the support by the suitable screws the shaft of the 5 motor (19) is coupled to the fan (20) of paddles (21) and interior brackets (28) remaining same inside the tube (14.1), being situated over it's outside- circular perimeter the diffussor (25), provided with the direction paddles (27), formed by the emerging zone (27.1)) and the 10 depressed zone (27.2)), over wich is mounted the shutter (29) with the help of the hinge (30). The proposed improvements bear in the first place in the system of attachment of the extractor fan (10) to the face, wall or the like on which is coupled, which is done 15 with the help of the hooks (18), see Figure 1, and once fixed to the opening provided in the corresponding wall it is finished fixing the support (14) with the help of the corresponding screws positioned at the corners (15), see Figure 1. 20 The hooks (18), as can be seen in Figures 1, 2 and 3, show three different zones, a retention zone (18,1), a spring zone (18.2) an a hook zone (18.3). The hook (18) is attached to the support (14) by the spring zone (18.2) which, since it has a cylindrical interior is coupled to 25 a cylindrical pin (35), in such a way that the hook zone (18.3) remains retained in the fringe (36) and lodged in the channels (34), whilst the retention zone rests on the recess (37) provided in the rear face of the support (14). 30 Aa further object of the present improvements remain-s in the front and centered position of all the connection electric and electronic elements in the front portion of the support (14), through the electronic circuit board (22), whose reduced dimensions allows it's 35 setting in the outer portion of the support (14), see Figure 2, keeping it safe from the undesired actions of -5 steams, liquids and condensations having foreseen that same is protected by means of the protector (23) see Figure 1, in which has been designed the availabil-ity of a sight (24) corresponding with the brackets (28) that is 5 in the lower portion of the front lid (13), not causing therefore any hindrance said protector (23) design and the protection of the circuit in order that the control pilot light, not shown in the Figures, may be seen from the outside through the protector (23) and the front lid 10 (13). Furthermore, other of the improvements foreseen in the present invention consist in the design of a small connector (31) which centralizes the electric wires (33) which relate to the hooks (18) as well as the hooks (18) 15 and the electronic circuit board (22), see Figure 1. Another further object of the present invention is the presence of the shutter (29) of a noticeably circular configuration provided at the diametral zone with the notches(29.1) which allow in the operating position of 20 the extractor fan (10) and because of the pressure generated by the movement of the fan (20) and the paddles (21) that the shutter (29) bends at the notches (29.1) allowing the passage of the air extracted from the room or bathroom where the extractor fan (10) is fitted and 25 not offering any kind of resistance to it, being provided it's construction with plastic materials or the like whose resistance to torque is minimal. When the extractor fan (10) goes to the idle position, the own inertia of the material in which has 30 been constructed the shutter (29) allows that same returns to its original position shutting the circular opening of the discharge tube (14.1) and preventing in this way that the temperatures' difference between the outside and the interior of the room where the extractor 35 fan has been installed to be the cause for the air, water, steams and other undesired elements to penetrate -6 from the outside towards the interior. A further object of the present invention is the working action of the hooks (18), which, when in the idle situation, occupy the above described position and 5 represented in Figures 2 and 3, whilst in the working position and when the installer adjusts the discharge tube (14.1) to the opening provided at the wall, the hook (18.3) will be practically perpendicular to the plane of the support (14), pressing strongly in the counter 10 clockwise sense at an angle of aproximately 900 till snap fitting the retainer (18.1) into the fringe (36) in such a way that the retainer (18.1) exerts a retention strength on the side walls of the opening made for the assembly of the extractor fan (10). 15 Another further object of the present invention consists in the improvements introduced in the disposition of the paddles (21) in the fan (20) in which, in grace to the proposed improvements are placed asymetrically, see Figure 1, by which are avoided the 20 noises and vibrations over the levels acceptable for the user, all that in combination with the design of the direction paddles (27) above described. Enough described in what the present Patent of Invention consists, it's understood that in same may be 25 introduced whatever detail modifications deemed convenient always provided that the variations introduced do not alter the essence of the Patent which is summarized in the following Claims