International Door Closers 231 Overhead Concealed Closer, Medium Spring Tension, 105 Degree Back Stop, No Hold-Open

International Door Closers 231 Overhead Concealed Closer, Medium Spring Tension, 105 Degree Back Stop, No Hold-Open

FEATURES

• CENTER HUNG DOORS: Double or Single Acting (Door stop applied to frame renders unit Single Acting). Adjustable “S” type side loading or “A” type, ”K” type and “PT” type end loading top arms are available for center pivoted applications.
• Built-in positive back stop and hold-open positions available:
• 105° Back Stop with Hold-Open
• 105° Back Stop - no Hold-Open
• 90° Back Stop with Hold-Open
• 90° Back Stop - no Hold-Open
• ADA spring tensions available for use on center pivoted applications:
• 5 lb. opening force (Interior door)
• 8-1/2 lb. opening force (Exterior door) • Standard spring tensions available:
• LIGHT, MEDIUM & HEAVY
• Two speed control valves:
• Closing and Latching speeds controlled by separate regulating valves, fully adjustable after installation.
• Fits in an aluminum header or transom bar as small as 1-3/4” x 4”.
• Positive centering for alignment and to hold door closed against any normal wind or draft. • Stable hydraulic door check fluid for any climatic operation and constant lubrication.