Lintel Sag Formula

new construction (2 years) old
The lintel has a sag.
What’s the formula for determining the sag is acceptable/unacceptable?
pb

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a divided by b and c equals the acceptable lintel sag.

please clarify a, b.

Was there additional information, like cracked brick/mortar, etc., visible?

Lintel design information may be found in *Technical Notes *
17B http://www.gobrick.com/html/frmset_thnt.htm

and 31B http://www.gobrick.com/html/frmset_thnt.htm

If this information is more than you feel confident understanding or relaying, you may consider reporting only what you see.

gap between mortar joint and lintel was approximately 3/16".

Something is going on there. It should not sag that much on that new of home. It will only get worse. I would call it out, refer it to a structural engineer and move one.