Grease Duct Cleanout Requirements

The grease duct wrap system.

Grease duct cleanout requirements.

Sections of grease ducts that are inaccessible from the hood or discharge openings shall be provided with cleanout openings. Fire wrap requirements proposed by client o clearance using a product whichs is 1 2 thick. Openings are required within 18 inches 457 2 mm of hoods containing dampers which block the opening of the duct which includes most water wash type hoods. Be located not more than 10 feet.

Grease ducts shall not have openings except where required for the operation and maintenance of the system. Ipc 708 9 access. Of grease duct enclosure assemblies. Grease duct cleanouts and openings shall comply with all of the following.

These requirements limit the combustibility surface fl ammability and smoke generation potential of the coverings used to enclose the grease duct. Cleanouts on 8 inch 203 mm and larger pipes shall be provided with a clearance of not less than 36 inches 914 mm for rodding. Access panels openings are required every 12 feet 3 7 m and at every change in direction of horizontal duct work unless the duct is large enough for personnel entry approximately 24 x 24. 14 round duct 154 sq.

In addition these requirements evaluate the effectiveness of the combination of the grease duct and the enclosure as a fi re rated system and as a thorough. This wrap shall extend from 18 inches below any combustible truss or wood joist to a point 18 above the surface of the roof covering or provide an 18 clearance to combustible material for the same distance or provide a noncombustible 1 hr fire rated shaft with a gyp board and 3 minimum clearance. Using chase with 0 clearance. Cleanouts on 6 inch 153 mm and smaller pipes shall be provided with a clearance of not less than 18 inches 457 mm for rodding.

A clean out must be provided at each change of direction except where the entire length of duct can be inspected and cleaned from either the hood or the discharge end. Be spaced not more than 20 feet 6096 mm apart. Nfpa 96 clean out requirements are as follows. Requirements construction clearances current code acceptance applicable listings installed costs warranty 12 x 12 square ducts 144 sq.

Ul1978 standard for grease ducts ul2221 tests of fire resistive duct enclosures astm e 814 standard test method for through penetration firestops astm e 119 standard.