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Standard for Measuring Residential Dryer Exhaust Duct Performance The NADCA Standard • 2014 16 International Residential Code (IRC): The IRC is a comprehensive, stand-alone residential code that creates minimum regulations for one- and two-family dwellings of three stories or less. It brings together all building, plumbing, mechanical, fuel gas, energy and electrical provisions for one- and two-family residences. Permanent Exhaust Duct: The total network of 4" rigid ductwork starting from an interior wall, floor or ceiling and terminating through an outside Exhaust Penetration. Pressure Tap Fitting: A device designed to penetrate the dryer transition duct in order to obtain internal pressure readings. Recommended: When the term recommend is used in this document, it means the practice or procedure is advised or suggested, but is not a requirement of this Standard. Rotating Vane Anemometer: A tool for measuring unevenly distributed or fluctuating flows through heating and cooling coils, diffusers, grilles, and filters. It accurately measures air velocity and temperature, calculates flow rate, performs averaging, and can determine minimum and maximum readings. Single Dryer Exhaust Ducts: Systems that have only one dryer unit attached to a residential-type 4" (102 mm) diameter rigid metal vent system. Shall: The word shall is defined as denoting a mandatory requirement. The criterion for conformance to this Standard requires that there be no deviation when shall is used. Secondary Lint Traps: A secondary lint screen that traps most of the lint normally being sent through the dryer exhaust duct. These devices prevent lint buildup in the exhaust duct and dryer booster fan when present and also act as a required clean out for dryer duct systems with vertical risers. Termination Device: A device that will prevent backdrafts from outside as well as prevent birds or other wildlife from building nests or taking refuge in the ductwork. The wall cap should present minimal resistance to the flow of exhaust air and should require little maintenance to prevent clogging. Termination Device Damper: A device installed on the last exhaust penetration that prevents outside backdrafts and weather elements from entering into the duct. Transition Duct: The connection (flexible or rigid) between the dryer manufacturer's exhaust outlet and the dryer exhaust duct in the wall, floor, or ceiling of the building structure. Test Duct: 4' - 6' long, semi-rigid duct with continuous 4" interior diameter whether compressed or stretched. Visual Inspection: Visual examination with the naked eye of the cleanliness of the dryer vent system.