Basic identification, field checks, risk lanes, and foreman wording.
Rough guidance or field math only when verification still controls.
Gather inputs, then confirm with foreman, shop standard, drawings, or approved detail.
Document readings and stop guessing. Foreman, startup, service, TAB, or manufacturer direction wins.
Year 1 · material ID
Yes · strong fitS-cleats and drive cleats in the staging pile
Green apprentice needs to tell S-cleats, drive cleats, and joint types apart before bringing the wrong metal back.
What TinnerFlow should do
- Show visual clues: S channel, drive cleat, hemmed edge, TDC/TDF flange, Ductmate/companion flange.
- Explain where each connector shows up.
- Give the apprentice a clean way to ask before grabbing the wrong bundle.
Best path
Photo ID and Field Rescue should handle this quickly. This is exactly the apprentice connector-identification lane.
Ask Foreman script
“I’m at the staging pile. I see S-cleats, drive cleats, and flanged connection parts. For this low-pressure run, do you want S-and-drive here, or should I be grabbing the TDC/Ductmate material?”
Year 2 · layout/fab math
Verify · do not fake it3-piece gore elbow around a finished lobby column
Apprentice is being asked to field-fabricate advanced layout while tired, under pressure, and without the shop standard in front of them.
What TinnerFlow should do
- Help collect the needed inputs: diameter, angle, number of gores, centerline radius, connection type, allowance, and available space.
- Warn not to invent the flat pattern from memory.
- Route the apprentice to shop/foreman verification before cutting material.
Best path
TinnerFlow can prep the question. It should not pretend to approve advanced flat-pattern math.
Ask Foreman script
“I need to roll this spiral around the column. I have the diameter, angle, space, and connection type. Before I cut, do you want the shop template, a field-measured offset, or a prefabricated fitting?”
Year 3 · airflow math
Partial · calculator opportunity350 CFM target, 450 FPM reading, grille neck size matters
Apprentice understands CFM and FPM are not the same, but needs a quick rough field check before damper adjustment.
What TinnerFlow can do now
- Help investigate low/no airflow, damper access, closed dampers, flex restrictions, and TAB readiness.
- Route to airflow/system walk checks.
- Tell the apprentice what information to collect before asking TAB/foreman.
What is missing
A dedicated rough airflow calculator: CFM = area × average velocity, with rectangular/round/grille-area inputs and a warning that TAB readings and approved balancing direction control.
Ask Foreman script
“Print calls for 350 CFM. I measured an average 450 FPM at the grille. I need to confirm neck/free area before I adjust the damper. Do you want me to calculate a rough CFM check or wait for TAB direction?”
Year 4 · startup/commissioning
Escalate · controlled issueBlower motor nameplate says 14.2 FLA, clamp meter reads 16.5A
Apprentice sees an over-amp condition on a new rooftop package unit and is worried about overheating, overloads, and inspection timing.
What TinnerFlow should do
- Tell the apprentice not to keep running equipment hot while guessing.
- Document motor nameplate, voltage, amp draw, belt/sheave condition, filters, rotation, access panels, and static-pressure info if directed.
- Escalate through foreman/startup/service lead/manufacturer direction.
Boundary
TinnerFlow can support install-side documentation and communication. It should not act like a service diagnostic app or electrical approval tool.
Ask Foreman script
“The blower motor nameplate is 14.2 FLA and I’m reading 16.5 amps. I’m stopping before running it hot. I have voltage, belt/sheave condition, filters, rotation, and access panels checked. Do you want startup/service involved or a static-pressure check next?”
Build takeaway
The strongest TinnerFlow lane is not “do every HVAC calculation.” It is identify → risk lane → first checks → better foreman question → avoid guesswork. The next calculator worth building is a guarded Airflow Quick Check; advanced gore layout and startup diagnostics should stay verify/escalate lanes.