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 #HVAC #DuctDesign #SMACNA #ASHRAE #AirBalancing #MechanicalEngineer #Construction #MEP #SaudiBuildingCode #DuctInstallation #EngineeringTutorial #HVACTechnician