What do the letters mean on a door closer?

What do the letters mean on a door closer?

S and L are closing speed adjustment valves for a commercial door closer; where “S” indicates the sweep speed valve adjustment and “L” indicates the latch speed valve adjustment.

What are the different grades of door closers?

Among other specifications for each grade, door closers are subjected to a “cycle count”:

• Grade 1 = 2,000,000 cycles with a minimum efficiency of 60 percent.
• Grade 2 = 1,000,000 cycles with a minimum efficiency of 60 percent.
• Grade 3 = 500,000 cycles with a minimum efficiency of 50 percent.

What doors need closers?

Heavy-duty closers are recommended for high frequency doors, exterior doors, and in schools or public buildings where heavy use or abuse is expected. For doors used less frequently, a smaller closer may be acceptable and will typically cost less than a heavy duty closer.

What is backcheck on door closer?

A backcheck feature set and adjusted by an independent valve. When introduced the backcheck stalls the opening of the door around 70 degrees. When doors are violently opened by pedestrians or wind, the backcheck feature reduces the likelihood of damage should contact be made with an adjacent wall or obstacle.

How do I know what size door closer to Buy?

Check the width and height of the frame and door.

1. Heavier doors will require a closer with a larger power size for optimal performance.
2. If it is an extremely narrow frame, you may need to consider a concealed door closer.

Do door closers wear out?

Most storm and screen doors are equipped with mechanisms to assure automatic closing and to protect the door from opening too wide or being blown open by wind. These door closers seldom break, but they need regular lubrication to keep operating smoothly and occasional adjustment to compensate for internal wear.

How long should a door closer take to close?

Conclusion. A door closer should take at the minimum 5 seconds to close the door from the 90 degree open position to the 12 degree open position, according to section 404.2. 8 of the ADA Standards.

Is a door closer necessary?

A door closer will ensure that your entrance door has closed securely after someone passes through it. This prevents your property being left vulnerable to thieves etc. Most closers have a backcheck facility which prevents the door from being opened too fast. This can happen on external doors during high winds etc.

Why is the 696 ramp to I 75 closed in Michigan?

MDOT: I-696 Ramps To Northbound I-75 Closing In Oakland County This Weekend The Michigan Department of Transportation announced that I-696 ramps to northbound I-75 will be closed this weekend in Oakland County to repair pavement. A Royal Oak woman was arrested after allegedly driving more than 124 mph on Interstate 696.

What’s happening on I-696 in Detroit?

According to authorities, a vehicle was struck by gunfire multiple times on the freeway. No injuries were reported. Ramps from I-696 to northbound I-75 will close this weekend through Labor Day weekend due to construction. Road work will cause several road and freeway closures this weekend across Metro Detroit.

What is that green stuff on I-696?

A mixture of three chemicals caused an emergency investigation by the environmental protection agency in Madison Heights. Macomb County Engineers Working To Stop Green Substance Spread On I-696 Macomb County engineers are working to stop the spread of a green substance found oozing onto I-696, according to officials.

Who was arrested for driving 124 mph on I 696?

A Royal Oak woman was arrested after allegedly driving more than 124 mph on Interstate 696. Police say the pistol was registered to the 20-year-old, but he does not have a concealed pistol license. A mixture of three chemicals caused an emergency investigation by the environmental protection agency in Madison Heights.