These mullions have a weaker bond and deflect easily, while also creating additional, unwanted areas for air and water to infiltrate. Harvey offers a superior, common jamb solution that makes installation of multiple units as easy as one, engineered with a one-piece header, one-piece sill, and a single vertical mullion to receive the sashes on either side.
Since Harvey’s common jamb is a single frame with an uninterrupted nail fin, it is stronger and more weather tight, allowing for faster installation and flashing.
- Aluminum reinforcement of mullion standard for windows over 48" high
- Uninterrupted nailing fin allows for faster installation and flashing
- Anchor straps included
- Up to 4-wide configurations
- Available in both J and L fin for new construction and also comes in replacement style