Industrial Automation & OT Domains: From PLCs to Cybersecurity Most people think industrial automation = PLC programming. But that’s just one piece of a much bigger system. Modern OT (Operational Technology) brings together multiple domains - all working as one to run, monitor, and secure industrial processes. I created this roadmap to make that big picture easier to understand 👇 It covers the full lifecycle: Design → Build → Operate → Secure And highlights the key domains every engineer should know: • PLC & HMI Programming • SCADA & High-Level Monitoring • Industrial Communication Protocols • Distributed Control Systems (DCS) • Motion Control & Robotics • Industry 4.0 & IIoT • Smart Factory & Edge Computing • Functional Safety • OT Cybersecurity (IEC 62443) • Digital Twin & Virtual Commissioning The reality: The best engineers don’t just know one tool they understand how systems connect end-to-end. That’s what makes operations reliable, ...
Doors slamming drafts near entrances strange odors moving between rooms.
This is not an HVAC equipment issue.
This is a pressurization failure.
Most engineers focus on airflow and tonnage.
But ignore one critical thing:
Pressure balance.
Look at this example:
Supply air = 18,000 CFM
Total exhaust = 6,600 CFM
Net airflow:
CFMₙₑₜ = 18,000 − 6,600 = +11,400 CFM
Building is positively pressurized.
But here’s the real problem:
AHU outdoor air = 3,600 CFM
Exhaust = 6,600 CFM
→ Deficit = 3,000 CFM
That means:
You need a dedicated Make-Up Air Unit (MAU)
And this is where most designs fail:
• Ignoring exhaust vs OA imbalance
• Not providing dedicated MAU for kitchen exhaust
• Allowing uncontrolled infiltration
• Designing without pressure hierarchy
Consequences?
• Negative pressure pulls in hot, humid, dusty air
• Doors become hard to open (>0.05 in.w.g)
• Kitchen exhaust disrupts entire building airflow
• IAQ complaints start from day one
Correct design means:
• Maintain +0.03 to +0.05 in.w.g in occupied spaces
• Keep toilets and kitchens under negative pressure
• Always balance supply, exhaust, and makeup air
• Never rely on leakage to compensate airflow
Important:
Kitchen exhaust without MAU is one of the biggest real-world design mistakes.
Good HVAC design is not just about moving air.
It’s about controlling where the air moves.
If you understand pressurization, you control the building.
If you’re looking to build a career in MEP with Autodesk certification and real job opportunities, WhatsApp
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