by the sash the edge of the bar will engage the pin when the sash has reached the degree to which it is allowed to tilt in its fully tilted open position when the sash reaches this position the tilt control bar is well away from reaching a frame perpendicular position in the embodiment shown in fig1 the sash is provided with a plurality of insert holes 165 to selectively receive the pin 167 when the pin is inserted into the uppermost of the holes 165 the sash will be allowed to tilt farther open than it would be if the pin is positioned in one of the lower holes therefore in this embodiment the maximum tilt angle of the sash is adjustable by virtue of the positioning of pin 167 fig1 shows a sash 170 with a tilt limit bar pivotally mounted at 172 to the sash also provided in this embodiment is a flexible or bendable bar movement controller in the form of a chain 174 having one end secured to the bar and the other end secured to the sash as will be appreciated from fig1 the sash will reach its maximum tilted open position when the chain is extended to its maximum length the chain then stops the pivotal movement between the control bar and the sash this occurs well before the bar is able to reach a position perpendicular to the frame fig1 shows a sash generally indicated at 176 a tilt control bar 177 is used to determine the maximum tilted open.