Extruded PVC components produced from commercial quality virgin PVC (unplasticised polyvinyl chloride), conforms to AAMA 303 from sections in one piece, straight, true and smooth. Provide multi-chambered PVC extruded frames and sash in accordance with the manufacturers standard practice. Fusion welded frame joints strong enough to develop full strength of members. Meeting rails have an integral interlock with two lines of pile weather-strip provided. Upper and lower sash shall have the same glass size. Sash has a fusion welded mitered corners. A snap in sill insert sloped to provide positive weep system with appropriate slots and slope to provide drainage to the exterior.

Balance Mechanism & Operation – lower sash: Two ¹/₂” stainless steel, constant force coil spring balances. Enclose balance springs in rustproof cases, from the top of the bottom sash to the head of the window unit. Balances also have an interlocking pivot bar, and provide positive locking of sash location when sash is tilted in for cleaning.

Balance Mechanism & Operation – upper sash: Two inverted block & tackle spring balances. Balances also have an interlocking pivot bar, for integral frame alignment with sash for keeping window frames straight and true during installation. Upper sash to be further secured using removable jamb stop inserts below with integral screen track. Removal of insect screen and stops will allow the top sash to be lowered and tilted in for cleaning. Balance to provide positive locking of sash location when sash is tilted in for cleaning.

Locking Device: Each window over 32 inches in width with two cam-action sweep sash Locks, and windows under 30″ in width with one lock. The lower sash has one continuous, integral lift rail at the bottom of the sash. Two tilt latches are provided in the top of each sash for tilting in sash for cleaning. The tilt latches shall be integrally mortised into the sash top rails for a clean appearance.