A trainee welds a joint on a jet engine — except the engine isn't real, the sparks are pixels, and a mistake costs nothing but a lesson. Down the hall, a technician looks at a pump through smart glasses and sees glowing arrows showing exactly which bolt to turn next, with the machine's live temperature floating beside it. This is AR and VR in industry , and it is no longer science fiction — it is a core pillar of Industry 4.0 and the emerging Industry 5.0. This guide explains how these immersive technologies are used across industry, and — crucially for students and startups — the best open-source tools you can use to build them for free. Figure 1. AR overlays digital data onto the real world; VR immerses you in a virtual one. Together they form Extended Reality (XR), letting industry visualise machines, data and processes in three dimensions. Table of Contents AR vs VR vs MR vs XR: The Basics Why Industry Is Adopting XR Industrial Applicatio...
Choose the wrong fan and you will feel it every day — a bathroom that stays damp, a kitchen full of lingering smells, a stuffy office, or an air conditioner that runs forever and never quite cools. The number that prevents all of this is CFM — cubic feet per minute, the amount of air a device moves. This guide explains exactly how to calculate CFM for exhaust fans, duct and inline fans, air conditioners, kitchen hoods and whole-house ventilation , and gives you a free multi-mode CFM calculator (validated against ASHRAE and SMACNA references) to size any device in seconds. Figure 1. CFM measures how much air a device moves each minute. The same idea sizes an exhaust fan, an inline duct fan, an air conditioner blower or a kitchen hood — only the required rate changes. Table of Contents The CFM Calculator (5 Modes) What Is CFM? The 3 Core CFM Formulas Recommended Air Changes per Hour (ACH) CFM by Device Type Static Pressure: Why Real CFM...