Closers for interior and exterior doors shall be full rack-and-pinion type with cast aluminum alloy shell.

Closers shall be surface mounted and shall project no more than 2-1/8" from the surface of the door with a standard cover.

Closers shall be non-handed to permit installation on doors of either hand. Closer fluid shall contain lubricity and anti-oxidation agents.

Closer fluid shall maintain stable viscosity to allow doors closer to perform in temperatures ranging from extremely high to as low as -40°F.

Closers shall have multi-size spring power adjustment to permit the setting of spring from size 1 through size 6.

Closers shall have two non-critical valves, hex key adjusted, to independently regulate sweep speed and latch speed.

Closers shall have adjustable backcheck intensity controlled by a hex key adjusted valve.

[Closers shall have adjustable delayed action closing controlled by a hex key adjustable valve.]

Regular arm and top jamb closers shall have a non-hold open shoe permitting 15% ( + or – 7-1/2% ) power adjustment.

Norton 8501-H Door Closer Hold Open, Surface Mounted Regular Arm, Top Jamb, and Parallel Arm, Multi-Size 1 thru 6

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