Select fans for AHU airflow and static-pressure requirements.
npx skills add https://github.com/toneron2/RWS --skill ahu-airflow
Please help me install this Agent Skill. Skill: ahu-airflow Source: https://github.com/toneron2/RWS/tree/main/.claude/skills/ahu-airflow Command: npx skills add https://github.com/toneron2/RWS --skill ahu-airflow
This Skill selects fans and analyzes system airflow to meet CFM and static pressure targets while optimizing efficiency and acoustics.
Run with state/psychro.json and state/concept.json to produce state/fans.json.
High-intent search queries and answers about installing and using this skill.
Fan selection for AHU systems requires matching fan type—plenum, axial, backward-curved, forward-curved, or vaneaxial—to your CFM and static-pressure requirements. This Skill calculates total static pressure across your system components, determines the operating point on the fan curve, and recommends the most efficient fan that meets your airflow targets while minimizing noise.
Total static pressure is the resistance the fan must overcome to move air through ducts, coils, and filters. It directly determines which fan curve your system operates on and affects motor sizing, energy consumption, and noise levels. Accurate calculation ensures your selected fan delivers the required CFM without oversizing or undersizing.
Balancing CFM delivery with noise involves evaluating the fan's operating point relative to its peak efficiency curve and assessing blade-pass frequency and motor vibration. This Skill performs acoustics assessment alongside performance analysis to help you choose fans that meet airflow targets while keeping sound levels acceptable for the space.
Motor sizing depends on the fan's brake horsepower at your system's operating point, accounting for service factor, efficiency, and VFD compatibility if variable speed is required. This Skill calculates motor requirements across fan types and identifies whether a standard or premium-efficiency motor is needed for your design.
Yes. This Skill applies to central HVAC AHUs and packaged equipment in both new construction and retrofits. It handles the same fan-selection and pressure-analysis process regardless of installation context, helping you right-size fans for existing systems or new designs.
Fan selection requires psychrometric data (state/psychro.json), system concept information (state/concept.json), coil specifications (state/coils.json), and performance constraints (state/constraints.json). The Skill processes these inputs to generate a complete fans.json output with design ID, performance curves, motor specs, and acoustics metrics.
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