Скачать или смотреть HVAC Duct Design & Installation | SMACNA, ASHRAE, SBC | Formulas & Testing Guide(updated)

🧰 Description (Easy to Copy & Paste)

Learn complete duct design and installation — from theory to field application.

Formulas:
• 🔹 Pressure = (ρ × V²) / 2 → Example: ρ=1.2 kg/m³, V=8 m/s → P=38 Pa
• 🔹 Flow = Area × Velocity → Example: 1.8 m³/s = 0.3 m² × 6 m/s
• 🔹 ΔP/L = (f × ρ × V²)/(2 × D) → Design ≈ 1 Pa/m
• 🔹 De = 1.3 × ((a × b)^0.625)/((a + b)^0.25)
• 🔹 CFM = Velocity × Area

Standards:
SMACNA 208 • ASHRAE 62.1 • ASHRAE 90.1 • SBC 501 • DW 143

Installation Steps:
1️⃣ Verify layout & support spacing (SMACNA)
2️⃣ Seal joints with mastic or tape
3️⃣ Insulate and label
4️⃣ Test leakage ≤ 5 % (DW143)
5️⃣ Balance airflow and submit as-built

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