Mechanical · M-QN4AG

Grease Exhaust Duct to Hood

Materials

Steel Stainless Steel Metal (misc.)

Elements

Walls Doors Roofs Ceilings Floors / Slabs Waterproofing / Flashing Drainage Connections / Plates Roof / Floor Openings

Connections

Welded Connection

About this detail

The grease exhaust duct connects to a Type I kitchen hood and is constructed from minimum 16 gauge sheet steel or 18 gauge stainless steel, with all joints and seams welded or brazed externally to prevent leaks. The duct slopes at a minimum of one-quarter inch per foot toward the hood or grease reservoir, avoiding any grease pockets, and is wrapped continuously from hood to roof in two-hour fire-rated ceramic fiber insulation. The duct penetrates the roof with flashing and waterproofing, connecting to an exhaust fan mounted on a field-fabricated steel platform with a flexible duct connection. Access doors are provided at intervals along the enclosure and elbows to facilitate cleaning, and the installation maintains specified minimum clearances from combustibles, air intakes, and property lines.

NOTICE: 1. GREASE DUCT SHALL BE CONSTRUCTED OF SHEET STEEL OF NOT LESS THAN 16 GAUGE THICKNESS. 2. WELD OR BRAZE ALL DUCT JOINTS & SEAMS ON THE EXTERNAL SURFACE. 3. SUPPORT DUCTS AS REQ'D. BY SPECIFICATIONS. DO NOT PENETRATE DUCT WALLS W/ SCREWS, NAILS, ETC. 4. GREASE DUCT SHALL NOT CONTAIN GREASE POCKETS. 5. FITTINGS SHALL COMPLY WITH, SMACNA STANDARDS, LATEST EDITION. 6. PROVIDE A.D. 'S EVERY 10'-0" ALONG ENCLOSURE, FROM HOOD TO GEF PER FIREMASTER INSTALLATION INSTRUCTIONS. 7. DUCT ENCLOSURE MATERIALS & INSTALLATION SHALL COMPLY IN ALL RESPECTS W/ SECT. 508.4, 2001 CMC, FOR TYPE 1 GREASE HOOD. FLOOR LEVEL HOOD CONNECTION VERIFY EXACT DIMENSION WITH KITCHEN EQUIPMENT SHOP DRAWINGS SLOPE DUCT 1/4" PER 12" MINIMUM UNLESS OTHERWISE NOTED ON PLANS THERMAL CERAMICS FIREMASTER DUCT WRAP 2"x2" IN COMPLIANCE WITH ICBO GREASE DUCT TEST STANDARD, OR 1-1/2" FASTWRAP (UL G-14, UL C-AJ-7098 FOR 2 HOUR) COMMERCIAL KITCHEN GREASE DUCT WRAP (SUBJECT TO APPROVAL BY LOCAL JURISDICTION). CONTINUOUS FROM HOOD TO ROOF. ACCESS DOOR (TYP) CEILING ROOF EXHAUST TERMINATION, 10' MINIMUM FROM ADJACENT BUILDING, ADJACENT PROPERTY LINE, AIR INTAKES OF 10' ABOVE ADJOINING GRADE LEVEL. DISCHARGE SHALLBE A MINIMUM OF 40" FROM ROOF LEVEL TERMINATE SCROLL DRAIN ABOVE GREASE RECEPTOR RECESSED INTO BASE FIELD FABRICATED SHEET METAL PLATFORM FLEXIBLE DUCT CONNECTION EQUAL VENTRAFABRICS VENTSIL ROOF PENETRATION PROVIDE FLASHING AND WATER PROOFING REMOVABLE CLEANOUT COVER EXHAUST FAN FOR TYPE I HOOD: IN DUCT MIN VELOCITY 500 FPM; MAX 2,500 FPM FOR TYPE I HOOD: DUCT GAGE NO. 16 MSG STEEL OR NO. 18 MSG STAINLESS STEEL SECTION 510.5 40" MINIMUM APPROVED FILTER, INSTALLED AT AN ANGLE NOT LESS THAN 45° FROM HORIZONTAL OR WATER WASH SYSTEM PROVIDE 18" BETWEEN HOOD AND UNPROTECTED COMBUSTIBLES, 3" MIN FROM PROTECTED COMBUSTIBLES, OR 0" FROM NONCOMBUSTIBLE MATERIALS COOKING SURFACE SEE TABLE 5-2 FOR MINIMUM HEIGHTS SECTION 509.5 4' FT MAX. SECTION 509.6 6" MIN OVERHANG SECTION 509.6 FLASH SOLID AT CEILING AND WALL IF LESS THAN 12". SECTION 509.4 GREASE GUTTERS

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