FAQ Knowledge Articles

For Ultimate Casement (UCA) and Ultimate Wood Casement (UWCA) Horizontal Pivot Circle or Oval windows, the minimum Rough Opening (RO) width and height dimensions are 25" and the maximum Rough Opening (RO) width and height dimensions are 49". 

For oval or elliptical-shaped pivot units, however, the height must be greater than the width. Therefore:
  • For UCA, elliptical-shaped pivot window units, the RO width minimum is 25", but the maximum RO width is less than 49" as the height must be greater than the width.  For the Clad elliptical-shaped pivot window height dimension, the minimum RO height is greater than 25" as the height must be greater than the width and the maximum RO height is 49". 
  • For UWCA, elliptical-shaped pivot window units, the ellipse must be greater in height than width and must comply with the Quasi-Radial requirements per Marvin Technical Bulletin (please contact your Marvin representative for more information). 
  • Units outside of these dimensions must be evaluated by Marvin Signature Services on a case-by-case basis. Contact your local Marvin dealer.

UCA and UWCA Horizontal Pivot Circle or Oval Windows are non-rated products and generally have an extended lead time of 12-14 weeks from time of order.