top of page
Internally Lined Ducts: Recalculate Clear Area Before Pressure Loss
Adding 25 mm lining to an 800 × 500 mm metal opening removes 15.6% of its air area. At unchanged airflow, the effect on velocity pressure is much larger.
16 hours ago5 min read
Duct Expansion Transitions: Angle, Static Recovery and Total-Pressure Loss
A widening duct can gain static pressure while still losing total pressure. Calculate both before assigning a benefit to a longer transition or crediting recovery in the fan calculation.
4 days ago4 min read
Ductless vs. Ducted: How Jet Fan Systems and CFD Modeling Are Reshaping Basement Clearance
Jet fan systems can reduce distributed ductwork and protect basement headroom—but only when extract, makeup air, controls and CFD verification are designed as one coordinated system.
Sep 119 min read
HVAC Duct Design: How to Calculate Friction Loss, Equivalent Length, and Total Static Pressure
Learn the complete duct-pressure workflow: size each section, calculate straight and fitting losses, identify the critical path, determine AHU external static pressure, and select the fan duty.
Sep 312 min read
HVAC Design Fundamentals: A Practical Guide from Cooling Load to Duct Design
Learn the fundamentals of HVAC design, from cooling-load calculations and system selection to airflow, duct sizing, equipment selection and commissioning. This practical beginner-friendly guide explains the complete design roadmap and introduces Nexora resources that help you strengthen your HVAC knowledge and calculation skills.
Aug 246 min read
How to Design a Chilled Water Piping System Step by Step
Learn how to design a chilled-water piping system step by step—from cooling-load and flow-rate calculations to pipe sizing, pressure-loss analysis, pump-head selection, valves, controls, insulation and commissioning. Includes practical equations, diagrams, tables and a complete worked example for HVAC and MEP engineers.
Aug 2424 min read
Complete Guide to HVAC Duct Design and Sizing
HVAC duct design and sizing ensure that the correct amount of conditioned air reaches each space efficiently. Proper duct sizing balances airflow, velocity, and pressure loss to maintain comfort while minimizing energy consumption. Using methods like the Equal Friction Method and accurate airflow calculations helps engineers design duct systems that deliver reliable performance and optimal HVAC efficiency.
Mar 105 min read
bottom of page