// CODE SNIPPET
505.1 Domestic Systems
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Where domestic range hoods and
domestic appliances equipped with downdraft exhaust are
provided, such hoods and appliances shall discharge to the
outdoors through sheet metal ducts constructed of galvanized
steel, stainless steel, aluminum or copper. Such ducts shall
have smooth inner walls, shall be air tight, shall be equipped
with a backdraft damper, and shall be independent of all other
exhaust systems.
Exceptions:
- In other than Group I-1 and I-2, where installed in accordance with the manufacturer's instructions and where mechanical or natural ventilation is otherwise provided in accordance with Chapter 4, listed and labeled ductless range hoods shall not be required to discharge to the outdoors.
- Ducts for domestic kitchen cooking appliances
equipped with downdraft exhaust systems shall be
permitted to be constructed of Schedule 40 PVC
pipe and fittings provided that the installation complies
with all of the following:
- The duct shall be installed under a concrete slab poured on grade.
- The underfloor trench in which the duct is installed shall be completely backfilled with sand or gravel.
- The PVC duct shall extend not more than 1 inch (25 mm) above the indoor concrete floor surface.
- The PVC duct shall extend not more than 1 inch (25 mm) above grade outside of the building.
- The PVC ducts shall be solvent cemented.
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