{"slug":"x402-agent-api-onrender-com-api-v1-hvac-duct-size-99404c","title":"HVAC duct sizing calculator","host":"x402-agent-api.onrender.com","method":"POST","resource":"https://x402-agent-api.onrender.com/api/v1/hvac-duct-size","category":"other","description":"HVAC duct sizing calculator: any two of duct size (round or rectangular), airflow, velocity and friction rate. Round and rectangular equivalents, nearest standard sizes, friction loss per 100 ft (Darcy-Weisbach, Colebrook), velocity pressure, design checks. Equal-friction sizing, fixed-depth ducts, ","price_listed":0.002,"price_asked":0.002,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":169,"reported_calls_30d":2,"reported_payers_30d":2,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"airflow":1000,"friction_rate":0.08},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"additionalProperties":false,"properties":{"airflow":{"description":"Airflow: CFM (IP) or L/s (SI).","exclusiveMinimum":0,"type":"number"},"diameter":{"description":"Round duct diameter: in (IP) or mm (SI).","exclusiveMinimum":0,"type":"number"},"friction_rate":{"description":"Friction loss: in. w.g. per 100 ft (IP, typically 0.05-0.15) or Pa/m (SI, typically 0.4-1.2). With airflow, this is equal-friction sizing.","exclusiveMinimum":0,"type":"number"},"height":{"description":"Rectangular height: in or mm.","exclusiveMinimum":0,"type":"number"},"units":{"default":"IP","description":"\"IP\" (°F, CFM, in, BTU) or \"SI\" (°C, L/s, mm, kW). Default IP. Applies to inputs and results.","enum":["IP","SI"],"type":"string"},"velocity":{"description":"Air velocity: FPM (IP) or m/s (SI).","exclusiveMinimum":0,"type":"number"},"width":{"description":"Rectangular width: in or mm. With height, the duct size; alone, a fixed side (e.g. a ceiling depth) the other side is solved for.","exclusiveMinimum":0,"type":"number"}},"type":"object"},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"method":{"enum":["POST"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-10-10","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.002,"price_match":true,"latency_ms":169,"error":null}],"description_full":"HVAC duct sizing calculator: any two of duct size (round or rectangular), airflow, velocity and friction rate. Round and rectangular equivalents, nearest standard sizes, friction loss per 100 ft (Darcy-Weisbach, Colebrook), velocity pressure, design checks. Equal-friction sizing, fixed-depth ducts, IP or SI. Shows every step with the numbers. $0.002 USDC per call.","last_updated":"2026-10-07T14:45:39.733Z","schemes":["exact"]}