a double-hung window whose meeting rails are of the “plain”, non-check rail type; a “plain rail window” frame (1) does not use a parting stop, (2) the bottom rail is usually not beveled, (3) the thickness of the sash is 1-1/8″, (4) the top rail of the bottom sash contains a putty rabbet (none is employed in a “check rail window”) and (5) either sash may be fixed.
Millwork Definitions
Plain Rail Window
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