Norton®
Door Controls
General Information
Door Closer Sizes
It is important that every manufacturer's door closer is
sized and tested on the same basis. An industry standard has been adopted by the American
National Standards Institute (A.N.S.I.) for this purpose.
The test is based upon controlling a 100 lb. door which has
a center of gravity 18" (457mm) from the centerline of the door's pivot point
(hinges). A force meter is located on the door 30" (762mm) from the centerline of the
pivot point.
With the door closer installed, the door is opened to a
minimum of 3" (76mm) and allowed to close from the power of the door closer. The
greatest force exerted by the door closer, as the door closes between 3" (76mm) and
1/2" (13mm), determines the Closing Force of the door closer.
The following table shows the minimum Closing Force
permitted for each Closer Size. All Norton Closers meet or exceed these minimum closing
force standards.
| A.N.S.I. Door Closer Size |
A.N.S.I. Minimum Closing Force (Pounds) |
| 2 |
3 |
| 3 |
5 |
| 4 |
8 |
| 5 |
11 |
| 6 |
14 |
Some Series of Norton Door Closers are available with
"50% Power Adjustment." These closers have an easily-accessible nut that allows
the installer to adjust the closing force. These closers allow a 50% increase in the
Minimum Closing Force for any given size.
In the case of a Size 4 closer with an 8 Pound Minimum
Closing Force, the closer's Minimum Closing force could be increased by 50% (1/2), or 4
Pounds. The Closer would then have a Closing Force of 12 Pounds (8 Pounds + 4 Pounds).
Other Series of Norton Door Closers are available with a
"Multi-Size Power Adjustment" feature. These closers are equipped with an
easily-accessible nut or rachet that allows the installer to adjust closing force through
a range of sizes. Traditional Style closers are adjustable for sizes 2 thru 4 or for sizes
5 and 6. Modern Style closers have two distinct size ranges: Normal Power Range Closers,
adjustable for sizes 2 thru 6; Accessibility Code Closers, adjustable for sizes 1 thru 4.
(This Size 1 is not based upon Industry Standards, but is used to define a closing force
below a Size 2 closer.)
A third power adjustment available with Norton
non-hold-open Regular Arm and Top Jamb Mounted Closers is the "Adjusta-Power
Shoe". Merely by relocation of the Closer Forearm at the power shoe you can increase
or decrease the Closing Force by 7-1/2%. |
