Planning focus
Airflow requirements and pressure relationships depend on local mechanical/building codes.
Budget drivers
Existing duct capacity, shafts, fan condition and controls can affect renovation cost.
Operations and lifecycle
Dirty grilles, failed fans or poor schedules can undermine a good renovation.
Code and project boundary
Mechanical sizing, duct changes and electrical work belong to qualified professionals.
Educational planning only. Actual construction, code compliance, regulated systems, hazardous materials and safety-critical work require qualified professionals and current local requirements.