in the following detailed description , numerous specific details are set forth in order to provide a thorough understanding of the invention . however , it will be understood by those skilled in the art that the present invention may be practiced without these specific details . in other instances , well - known methods , procedures , and components have not been described in detail so as not to obscure the present invention . the following discussions of installation spaces for housing shutter rolling mechanisms consider , if not specifically indicated otherwise , the two cartesian dimensions which are perpendicular to the rolling axis of the discussed rolling mechanism and to each other as a first and a second installation mechanisms . such first dimension is , for example , a dimension parallel to the w mech dimension and such second dimension is a dimension parallel to dimension h mech1 ( fig2 a ). typically the space for installation of shutter rolling mechanism is limited in one dimension , e . g ., the width dimension ( width of the wall within which the mechanism is to be installed ). however , in many cases , the shutter rolling installation space may be less limited in another dimension , for example in its height dimension . some embodiments of the present invention take advantage of such installation spaces having one dimension longer than another dimension by providing shutter rolling mechanism that enable stowing the shutter / curtain in a stowing space having one dimension longer than another dimension , as differs from known stowing mechanism , such as mechanism 100 of fig1 . reference is made now to fig2 a which is a schematic illustration of shutter rolling mechanism 200 according to some embodiments of the present invention . shutter rolling mechanism 200 may be adapted to be installed within an existing installation space 202 formable in wall 101 , between two outer faces 101 a and 101 b of that wall . the distance w mech between wall faces 101 a and 101 b parallel to the horizontal dimension of installation space 202 is typically dictated by the structure of the respective wall . yet , typically the distance h mech1 , extending parallel to the vertical dimension of installation space 202 , available for installation space between lower beam 101 c of installation space 202 and upper beam 101 d of installation space 202 is more flexible and may typically be set to be longer than w mech , without negatively affecting the aesthetic aspect and without imposing undesired structural constraints on wall 101 . advantage is taken of this effect according to some embodiments of the present invention . shutter rolling mechanism 200 may be adapted to roll and stow shutter 220 over a rolling mechanism having one dimension longer than another dimension . accordingly , according to one embodiment of the present invention , shutter rolling mechanism 200 may comprise two rollers 210 a and 210 b arranged parallel to each other with their rolling axes parallel to each other in installation space 202 and adapted to roll shutter 220 over roller 210 a and then over roller 210 b and so forth . accordingly , the length of a single winding of rolled shutter 220 over rollers 210 a and 210 b is longer by 2 × hmech2 , where h mech2 is the distance between the axes of rollers 210 a and 210 b , compared to known shutter rolling mechanisms using a single roller of the same radius rroller within wall having the same internal installation space width w mech . accordingly , the rollable length of shutter 220 may grow longer as the available installation height h mech1 is larger . rollers 210 a and 210 b may mechanically be engaged so as to roll together at the same direction and same rotational speed , for example by driving sprockets 211 a , 211 b and driving chain 230 . rolling of rollers 210 a , 210 b may be powered by an electrical motor ( not shown ), manual mechanism ( not shown ) or any other rolling powering means as known in the art . shutter rolling mechanism 200 may further comprise sensors to indicate fully opened and fully rolled positions of shutter 220 ( not shown ), rotation encoder to indicate actual deployed / stowed length of the shutter ( not shown ), guiding tracks to guide shutter 220 as it is deployed or stowed ( not shown ), controller to enable automatic deploy / stow operations ( not shown ), remote control transceiver to enable remote control of shutter rolling mechanism 200 ( not shown ), and the like , as is known in the art . similarly , additional configurations of shutter rolling mechanisms that require stowing space having vertical dimension longer than its horizontal dimension , are presented in fig2 b and 2c which are schematic illustrations of shutter rolling mechanisms 300 and 400 according to some embodiments of the present invention . fig2 b presents shutter rolling mechanism 300 comprising two sets of mini rollers 350 a and 350 b , each forming a rolling trajectory shaped as a semi - circle , the imaginary center of the first and the second semi - circles are located at a distance from each other similarly to distance h mech2 of fig2 a , thus forming a rolling mechanism that may stow a shutter as long as shutter 220 of fig2 a . rolling mechanism 300 may further comprise driving chains 360 that may be used for conveying drive from one end of mechanism 300 ( e . g ., mini rollers 350 a ) to the other end ( e . g ., mini rollers 350 b ) and may further provide mechanical support to shutter 220 when in stowed position . fig2 c presents yet another configuration for extended shutter rolling mechanism 400 . rolling mechanism 400 may comprise two sets of mini rollers 450 a and 450 b each forming a rolling trajectory shaped as a semi - circle , the imaginary center of the first and the second semi - circles are located at a distance from each other similarly to distance h mech2 of fig2 a , thus forming a rolling mechanism that may stow a shutter as long as shutter 220 of fig2 a . rolling mechanism 400 may further comprise tensioning mini rollers 460 located substantially in similar distance between the imaginary centers of the semi - circles and in locations that allow fluent movement of shutter 220 over the mini rollers while keeping shutter 220 sufficiently tensioned . as may be clearly seen in fig2 c , in some embodiments using this configuration the stowed shutter may be even longer than that of the configuration of fig2 b having the same h mech2 . some constructions may dictate installation spaces for the stowed shutter having their longer dimension extending in different direction than the vertical dimension as presented fig2 a to 2c . reference is made to fig2 d which is a schematic illustration of shutter rolling mechanism 500 according to some embodiments of the present invention adapted to stow and deploy shutter 220 , which takes advantage of installation space 510 having its horizontal dimension longer than its vertical dimension . rolling mechanism 500 may comprise two rollers 550 a and 550 b installed spaced apart horizontally parallel to each other similarly to rollers 210 a and 210 b but located in a common horizontal plane . rolling mechanism 500 may further comprise driving chain 560 , similarly to driving chain 230 of fig2 a . it should be apparent to those skilled in the art that the configurations of fig2 b and 2c may be adapted for installation in an installation space such as installation space 510 having its longer dimension horizontal , with minor modifications . in some cases , the installation space available for installing shutter rolling mechanism may have a shape that is more complicated than a rectangle with one longer dimension and one shorter dimension , as in fig2 a - 2d . for example , an available installation space for shutter rolling mechanism may comprise two or more sub - spaces forming a non - single - linear space . reference is made to fig2 e which schematically presents rolling mechanism 600 according to some embodiments of the present invention , installed in non - single - linear installation space 610 comprising vertical sub - space and 612 and horizontal sub - space 614 . in order to take advantage of installation space 610 , rollers 650 a , 650 b and 650 c and mini roller 660 may be located as seen in fig2 e , to form rolling path that takes advantage of the specific form of installation space 610 . it would apparent to those skilled in the art that other forms of installation spaces may be used according to some embodiments of the present invention in order to provide rolling mechanism that supports long shutters . reference is made now to fig3 a and 3b which are flow diagrams presenting operation of a shutter rolling mechanism according to some embodiments of the present invention . fig3 a is a flow diagram presenting stowing of a shutter according to some embodiments of the present invention . a shutter rolling mechanism built and operative according to embodiments of the present invention is provided [ block 3002 ]. the rolling mechanism is driven in the stowing direction [ block 3004 ] and is stopped when the shutter is fully stowed [ block 3006 ]. fig3 b is a flow diagram presenting deploying of a shutter according to some embodiments of the present invention . a shutter rolling mechanism built and operative according to embodiments of the present invention is provided [ block 3012 ]. the rolling mechanism is driven in the deploying direction [ block 3014 ] and is stopped when the shutter is fully deployed [ block 3016 ]. while certain features of the invention have been illustrated and described herein , many modifications , substitutions , changes , and equivalents will now occur to those of ordinary skill in the art . it is , therefore , to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention .