1.1 These requirements apply to clothes dryer transition ducts intended for venting household and
commercial clothes dryers.
1.2 The ducts covered by these requirements are intended to connect a clothes dryer to an existing
permanent duct provided as a part of the building structure. The duct is intenaed to vent lint and humid
air from drying clothes.
1.3 A product that contains features, characteristics, components, materials, or systems new or different
from those in use when the Outline of Investigation was developed, and that involves a risk of fire, electric
shock, or injury to persons, shell be evaluated using the appropriate additional component and end-product
requirements as determined necessary to maintain the level of safety for the user of the product as originally
anticipated by the intent of this Outline of Investigation. A product whose features, characteristics,
components, materials, or systems conflict with specific requirements or provisions of this Outline of
Investigation cannot be judged to comply with this Outline of Investigation. Where considered appropriate,
revision of requirements may be proposed and adopted in conformance with the methods employed for
development, revision, and implementation of this Outline of Investigation.