The h2x Blog
We publish practical guides, top tips and trends, latest news, and more stories related to the mechanical, plumbing and fire industry.
Latest Articles
Plumbing Fixture Units, Explained: Charts for Every Code
Supply, Drainage, and a Chart for Every Major Code
RIBA Plan of Work Stages: How They Shape Construction Projects
Every RIBA stage exists to answer a specific question at the optimal time to prevent project delays...
What Is Thermal Lag? Understanding Time Lag and Thermal Mass in HVAC Design
Why heat arrives hours after the temperature peaks, and what that means for cooling loads, plant sizing,...
Designing to BS EN 12831-1:2017 in h2x: A Step-by-Step Guide
A practical guide to configuring BS EN 12831-1:2017 heat loss calculations, ventilation inputs, and system settings in...
Commercial Plumbing Design Software: Five Takeaways for MEP Engineers
Review insights from a recent h2x live session on designing domestic water systems.
Best MEP Software in 2026: 10 Tools Compared
Compare the leading MEP design, calculation and BIM platforms to find the right software for your engineering...
Beat The MEP Software Learning Curve
Learn how to choose, introduce and support an MEP design platform your engineering team will actually use.
ASHRAE 183: The Industry Standard for HVAC Load Calculations
Learn what ASHRAE Standard 183 requires for HVAC load calculations and what engineering design software needs to...
How to Calculate Air Changes Per Hour
Learn the ACH formula, how to calculate air changes per hour from airflow and room volume, and...
Do Heat Pumps Work in Cold Weather? How They Extract Heat From Air Below 0°F
Yes, heat pumps can work below 0°F (-18°C). Here's how cold-climate systems extract heat, maintain capacity, and...
CFM Calculation Formula: 4 Ways to Calculate Required Airflow
Four CFM calculation formulas for ventilation, cooling load, and duct sizing, with a fully worked example.
How to Read a Psychrometric Chart (Without Losing Your Mind)
This psychrometric chart guide breaks down every property, process, and worked example in plain English.
Featured (Must-Read Blogs)
How To Calculate Duct Size: A Comprehensive Guide
Learn how to calculate duct size effectively with h2x's comprehensive guide below. Improve airflow and efficiency within...
What Are Cv and Kv? Flow Coefficient Formulas & Valve Sizing Explained
Learn how flow coefficient (Cv) impacts valve sizing. Explore their calculation, importance in fluid dynamics, applications, and...
Calculating Heat Loss: A Step-by-Step Guide
Learn how to calculate heat loss using U-values, surface areas, temperature differences, ventilation and thermal bridging.
Hazen-Williams vs. Darcy-Weisbach: Which Should You Choose?
Compare Hazen-Williams and Darcy-Weisbach for pipe friction loss, accuracy, simplicity, fluid type, and when to use each...
How to Size Water Pipes
To size water pipes correctly is critical for the performance of your design. Below, we will explore...
The Importance of Calculating Residual & Static Pressure
Water pressure is an essential aspect of every plumbing system. Here, we explain the importance of calculating...
Highlights (Free Downloads)
Ductulator Chart: Practical Guide for Mechanical Engineers (Free Download)
Duct size directly affects noise, energy, and layout, which is why you should use the Ductulator Chart...
FREE Pipe Volume Spreadsheet
Access h2x's free pipe volume spreadsheet to streamline calculations, optimise design, and enhance efficiency in piping projects.
Hardy Cross Method – Sizing a Ring Main (FREE Spreadsheet)
Flow rate and friction loss in a pipe network system can be difficult to calculate. When the...