Duct sizing rules of thumb

If you want to get a heated discussion started among HVAC professionals, start asking about the practices used in duct sizing. There is a passion among those in the HVAC industry in regards to the methods they use to determine what size ducts to install. These methods are often traditions passed down over decades, similar to what was passed down to me when I started installing many years ago. If you question the duct-sizing method, you question something that dad or even granddad passed down to you as the truth. The unintended results of these traditions are HVAC systems that fail to perform at their anticipated levels.
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How Many Air Vents Should You Have in One Room?

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Duct Design 2 — Available Static Pressure | Energy Vanguard

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Remember Me? Results 1 to 10 of Thread Tools Show Printable Version. For instance, instead of a proper duct underneath the furnace, it consisted of some sheet metal and cardboard in the dirt beneath the garage pad, the plenum was a swiss cheese of holes with miles of bent flex duct, a duct off the end of the trunk, a supply takeoff facing into the blower, leaks you couldn't believe and improper sealing, insulation and hangers to name a few.
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Please note that this is a reference guide and should not be viewed as a substitute for National or Local Fire Code. A commercial restaurant kitchen, grease, exhaust, type-1, vent hood is essentially comprised of three main components: 1 the Shell of the Hood, 2 the Baffled, Grease Filters, and 3 the Trough at the bottom of the Filters. An Upblast, Grease Fan that is on the exterior of the Facilities, accomplishes this. An additional Fan may be required as dictated by the amount of exhaust or by local code. To determine the correct size Grease Range Hood System to install, National Fire Code NFC dictates that the Hood should be 6 inches larger on all sides compared to all of the equipment that is under it.
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