The failure mode is ordinary. The phone rings during energy-code weeks, when new houses need the number before the certificate, nobody answers, and the insulation crew finishes before anyone knows the house misses 3 ACH50.
Daisy answers and writes the volume, the target ACH50, and which house before talking about a clock time. The Blower CFM turns those counts into CFM50 the target implies so the company sees a size, not a vague "can you come look."
Then one company is offered the note. A local tester sets the fan and writes the number. Daisy does not seal the house. If the window cannot be met, the caller hears the next real opening, not a promise that keeps the board pretty.
The note is the product. A callback that skips the volume, the target ACH50, and which house creates the second angry call.
