Controls the door through the entire opening and closing cycles by providing adjustable backcheck upon opening and adjusting general and latch speeds through the closing cycle.
Adjustable Spring Power – The D-3550 Series Door Closers are adjustable from size 2 through 6 with 15% adjustment over size 6. The D-3551 Series Door Closers are adjustable from size 1 through 4. The D-3551 Series Door Closers are designed to meet entrance accessibility requirements of 5 LBF opening force or less.
Non-Critical Regulation – The separate adjustments for backcheck, general and latch speeds are equipped with non-critical “V-Slot” regulating valves which allow for fine tuning the closing and latching speeds as well as the backcheck intensity.
All Season Fluid – All season fluid eliminates the need for seasonal adjustment. Special High Silicon Aluminum Alloy Housing All D-3550 / D-3551 Series Door Closers are constructed of Stanley R14 HIGH SILICON ALUMINUM ALLOY to exceed the ANSI/BHMAA156.4 Grade 1 requirements.
Forged Arms – Heavy duty forged arms are interchangeable between the D-3550 and D-4550 Series Door Closers.
High Impact Cover – All D-3550 / D-3551 Series Door Closers are shipped with a high impact self-extinguishing decorative cover.
Special Rust Inhibitor (SRI) – Optional – For installations where a higher level of corrosive resistance is required.
Maintenance Free – Door Closers mounted in accordance with the provided installation instructions are maintenance free from periodic inspection and adjustment.
Delayed Action – Optional – The D-3550DA/ D-3551DA Series Door Closers are equipped with a separate hydraulic valve adjustment to delay the closing speed from 180 to 70 degrees of door opening range.
Non-Handed – Can be used on both RH and LH doors for both push side and pull side mounting.