B/D Spring Size 2 thru 4 - E/F Spring Sizes 5 & 6 Help Me
Adjustable Sweep/Latch Speed: A dual purpose regulating valve, hex-key operated, permits independent adjustment of both sweep and latch speed.
Adjustable Backcheck Cushioning: An independent regulating valve, hex-keyoperated, provides an adjustable hydraulic cushion to the door opening speed toward the end of the opening cycle. This feature is standard with all but delayed action closers. Backcheck is not available with delayed action closers.
Non-Hold Open Arm: Standard closer will be supplied with a non-hold open arm. This arm is non-handed.
Hold Open Arm: Closer arm has adjustable hold open feature (90to 180?). This arm is non-handed for regular arm application only. It is handed for all friction hold open parallel arm installations. Order by suffixing "HA" to the Model number.
Warranty: Limited ten-year warranty for defects and life of the building on the aluminum housing.
Field Reversible: Closer spring can be field-reversed to accommodate the hand of the door. It is recommended that wherever possible the closer be ordered handed. Parallel hold open arms and delayed action closers are not reversible.
Model: Norton, 78, BD, EF, B/D, E/F, 78BD-RA, 78EF-RA, 78BD-PA, 78EF-PA, 78BD-HA, 78EF-HA, 689, 690, 691, 696, Silver Aluminum, Dark Bronze, Light Bronze, Satin Brass
Aluminum Alloy Shell: Norton? closer shells are constructed of a special aluminum alloy, carefully selected to accommodate individual closer characteristics and operating conditions.
Adjustable Spring Power: Clock-type coil spring affords a wide range of closer power. Permits a fine adjustment of the closer to the environment.
Rack & Pinion Operation: Provides a smooth transmission of power for control of the door through its full opening and closing cycle.
All 78-B/F Series closers comply with ANSI/BHMA A156.4 Grade 3 Specifications. All Norton? series 78-B/D closers with nonhold
open arms are listed by Underwriters Laboratories for labeled fire doors. This includes compliance to UL10C and UBC-72
(1997) for 3-hour assemblies. The product is manufactured in an ISO 9001 facility. These closers are also listed by the New York
City Materials and Equipment Acceptance Division.