All the quality features of the 350 Slider, but in a 3-Lite configuration with a choice of Side Vent or Center Vent. The meeting rail location can be ordered to match the meeting rails of the existing prime window.

The Side Vent has two inserts that open for ventilation and the Center Vent has one. Like the 350, the inserts and master frame have screwed corner reinforcement.

Full woolpile weatherseal and interlocking meeting rails. Automatic locking mechanism to resist forced entry.