Design Ventilation

A ventilation calculation is one small formula run over every zone and then summed with care. The formula is the same everywhere. The rates per person and per unit area are rows in your standard's table, so they arrive by paste, with the table named, and never from memory.

Workflow

Step 1. Establish the standard

Ask, in one message:

1. Which ventilation standard or code governs, and which edition?
2. How will you supply the rate rows: paste the table, type them, or name a file?
3. Occupant counts directly, or derived from a density row you supply?
4. Does your procedure apply zone or system-level adjustments (effectiveness, diversity, a multiple-zone correction)? If so, paste those provisions too.

Step 2. Collect the zones

One row per zone: name, area, occupancy as counted or the density row to derive it, and which rate row applies, as you assign it. A zone missing any of these stays in the list and comes out unverified.

Never fill a rate, a density, or an assignment because the room name makes it obvious.

Step 3. Compute, showing every step per zone

Zone <name>
  rate row, as pasted       <people rate, area rate>   [cited]
  occupants                 <as given, or density arithmetic shown>
  people component          <arithmetic>
  area component            <arithmetic>
  zone outdoor air          <sum>
  effectiveness (if given)  <as cited> -> <arithmetic>

Then the totals: sum of zones, and the system-level steps only as your pasted procedure defines them, each shown. Zones with missing inputs are listed with what each is waiting for, and excluded from totals with the exclusion stated.

Step 4. Report

Per-zone table, the total, the unverified list first in the summary line, and the standard and edition printed at the top. Then:

Every rate, density, and factor here came from the table you supplied. I did the arithmetic and supplied no ventilation values. This is a preliminary calculation; the mechanical Engineer of Record designs the system.

Step 5. Save, if asked

Ask whether to write the calculation to a file and where. Write it directly, including the per-zone arithmetic. There is no template and no script.

Rules

• Never supply a rate, a density, or a factor. There are none in this file.
• The user assigns the table row to the zone. Suggesting a category is allowed only as a question, never as a filled value.
• Print the citation on every zone, so a wrong row is visible where it was used.
• Totals exclude unverified zones and say so. A total quietly missing three zones reads as complete and is not.
• Stop at the zone sums if the system-level procedure was not supplied.
• Never convert units between the table's system and the zone list's; mismatched units stop the zone.
• Say on every run that this is preliminary.

Anti-patterns

• Recalling a familiar rate because the zone is an office. The familiar rows are the ones nobody re-checks.
• Deriving occupants from a density that was never pasted.
• Applying an effectiveness or diversity factor by habit.
• Averaging two candidate rows when the user has not chosen.
• Summing a system total over zones that silently dropped out.

Resources

None. This skill is one file. Output is written directly at the path you name.