what are ansi grade III doors?

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The American National Standards Institute (ANSI) and Builders Hardware Manufacturers Association (BHMA) have developed durability, strength and performance standards for every type of door hardware...
Mortise Locks: a lockset where the case is designed to fit in a mortise in the edge of a door Medium, high to extra heavy duty Commercial, multi-family and institutional applications Pros - ...
Cylindrical Locks: a bored lockset whose latch or bolt locking mechanism is contained in the portion installed through the cross-bore Medium, high to extra heavy duty Commercial, multi-family a...
The fluid in an LCN closer must not be refilled in the field. See attached Warranty and Repair Communication 
ANSI grade one cycle test is 500,000, grade two is 250,000 and grade three is 100,000.
The Schlage ND Series listing is: ANSI/ BHMA A156.2-2003 Grade 1
The S200 as of January 1st 2011 is no longer a BHMA grade 2 lock.  We are continually improving our products to meet our customers expectations as such the CS200 product line will be replacing...
Falcon 25 series is a ANSI/BHMA A156.3 Standard for Grade 1 device.
Falcon F-25 series is the UL Rated Fire Exit Hardware device is a ANSI/BHMA A156.3 Standard for Grade 1 device.
A copy of the BHMA Directory Listing can be viewed in the online Certified Directory on the BHMA web site. BHMA
Hinge Spacing: All 4 1/2" and 5" butt hinge spacing 1. Opening heights 3'0" through 4'11 15/16" (one pair butt hinges) from under head CL 9 3/4" (top of door 9 5/8") from bottom of frame ...
Hinge Backset: On the frame = 5/16" On the door = 1/4"
Lock Spacing: All standard bored locks ANSI 115.2 (161, 61L type), for mortise lock ANSI 115.1 (86 type) all locations must be altered 3/8" lower, and standard strike (ASA type). 1. Opening ...