VRF vs VAV vs AHU – Understanding the Real Difference in HVAC Systems In modern construction projects across Saudi Arabia — from high-rise towers to mega developments — selecting the right HVAC system is critical for efficiency, cost control, and long-term performance. As MEP professionals, understanding the practical difference between VRF, VAV, and AHU systems helps in better design decisions, coordination, and execution. Let’s break it down in simple engineering terms: 1️⃣ VRF – Variable Refrigerant Flow VRF systems circulate refrigerant directly from a single outdoor unit to multiple indoor units. Each indoor unit operates independently, allowing precise temperature control for different zones. 🔹 Ideal for: Offices, hotels, residential towers, clinics 🔹 High energy efficiency (inverter-driven compressors) 🔹 Flexible piping layout 🔹 Minimal ductwork requirement 🔹 Individual zone control 📌 Best suited where flexibility and energy savings are priorities. 2️⃣ VAV – Variable...
Plumbing traps might look simple, but they do a lot of heavy lifting in keeping buildings safe, clean and odor free.
Plumbing traps might look simple, but they do a lot of heavy lifting in keeping buildings safe, clean and odor free. A quick refresher on the ones you’ll see most often: P Trap Found under washbasins and sinks. It holds a small amount of water that blocks sewer gases from coming back into the room. S Trap Used in floor mounted toilets. Its curved path connects directly to the floor drain. U Trap A basic U-shaped seal that maintains a water barrier. Common in bathrooms and basin setups. Bottle Trap Seen under wall hung washbasins. It’s easy to clean and keeps the area looking tidy. Grease Trap A must in commercial kitchens. It captures oils and grease before they enter the drainage system. Gully Trap Placed outside buildings. It collects wastewater from kitchens and bathrooms before it goes to the main drain. Interceptor Trap Used in industrial or commercial sites. It separates heavy solids, grease or chemicals to protect downstream systems. Understanding the right trap for the ri...