Two pipes or openings on the side of a house can look almost identical, but that doesn’t mean the same furnace vent clearance from air intake applies to every installation. That’s where people get tripped up. A furnace vent may terminate near an outdoor-air inlet serving the building, the combustion-air intake for another furnace or … Read more
Furnace intake and exhaust pipe separation is one of those things that looks like it should have a simple code dimension. You have two PVC pipes coming through the side of the house—one is the furnace exhaust and the other is the combustion-air intake. So how far apart do they have to be? There is … Read more
Furnace vent clearance from window openings can vary depending on how the furnace is installed. A high-efficiency furnace is often vented through the side of the house with PVC pipe. Sometimes you’ll see two pipes—an exhaust and a combustion-air intake. Other installations may have only the exhaust terminating outside. So how close can that furnace … Read more
Most people see a high-efficiency furnace with PVC pipe running outside and immediately call it a direct-vent furnace. But what is a direct vent furnace under the IRC? The answer depends on where the furnace gets its combustion air and where the flue gases are discharged. The exhaust pipe tells you where the combustion gases … Read more
This article is written to the 2021 International Mechanical Code (IMC) and NFPA 96 (2021). Local amendments and AHJ interpretations may apply. Type I hood requirements aren’t based on kitchen size or how busy the operation feels — they’re triggered by what the cooking equipment actually produces. If you’ve ever been surprised by a failed … Read more
Dryer vent code requirements 2021 IRC—Dryer venting should be the simplest part of any laundry room, but it’s where more installations get flagged than just about anything else. If you’ve ever seen kinked flex duct crushed behind a dryer, vent runs stretched way beyond code, or—worst of all—exhaust dumping into an attic or crawl space, … Read more
Bathroom exhaust fan code requirements aren’t just technical—they’re one of the most commonly failed details on inspections, especially for remodels and fan replacements.. If you want to pass inspection the first time, you need to know exactly why the code requires bathroom exhaust fans to vent directly outdoors—and what will get flagged in the field. … Read more
Want to pass your AC inspection the first time? Understanding the NEC and IRC code requirements is the key to avoiding red tags and failed installs. If you’re prepping for an air conditioning (AC) inspection—whether you’re the electrician, HVAC installer, or inspector—understanding the NEC requirements is key to passing on the first try. This guide … Read more
