Latch products marked uppercase letter “F” comply with the positive-pressure requirements of ANSI/UL 10C.
UL had previously authorized the use of the lowercase letter “f” to denote products that comply with the positive-pressure-test requirements from those that complied only with the neutral-pressure test in ANSI/UL 10B.
The use of the lowercase letter “f” is no longer required for products in this category.
Note: Some manufacturers re-tooled their dies and may be marking their products with both an uppercase “F” and lowercase “f”.
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