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FUME HOOD REQUIREMENTS Building Division City of Palo Alto (CPA) Building Inspection 285 Hamilton Ave. Inspection Request: 650 329-2496 Revision Date: 2011 General Requirements/Checklist for: Commercial Codes Enforced: 2010 CBC, CPC, CMC, NFPA, CFC The information provided in this document is general and intended as a guide only. Each project is unique and additional requirements may be enforced as deemed appropriate. Plans shall be submitted to the city plan check to verify requirements mandated by CBC, CEC, CPC, CMC, NFPA standards, CFC, and City of Palo Alto Fire Prevention Bureau/Building Division Standard No.1 (see attachment). Inspections shall be required to verify equipment is properly secured to meet minimum seismic connection requirements. All equipment used inside the fume hood shall be tested and certified by a recognized testing agency. Hood construction shall be non-combustible in accordance with CBC standard 2-1 and City of Palo Alto Standard No.1 (see attachment). Electrical receptacles shall not be located within the hood enclosure. Electrical apparatus and appliances located within the hood interior are regulated by City of Palo Alto Standard No.1 and current California Electrical Code ART.500. Lighting shall be separated from the hood interior by a vapor tight barrier of safety glass or otherwise approved by the Building Division. Inspection required to verify Exhaust Requirements of fume hood to CMC Requirements, specifically, Section 505, 506 and 610. All ducting requirements shall adhere to City of Palo Alto Standard No. 1 and CMC. All duct material shall be metal and constructed in accordance with CMC Section 505, 506 and 610. Minimum air velocities are specified by CMC Section 505.2. CMC Section 502.1 defines product conveying duct classification. Ducts conveying explosive or flammable vapors, fumes or dust shall extend directly to the exterior of the building without entering other spaces. Termination of exhaust shall conform to CMC Section 506.9. Make up air shall be provided to replenish air exhausted by the fume hood ventilation system make-up intakes shall be located to avoid recirculation of contaminated air. An airflow interlock shall be required to meet City of Palo Alto Standard No.1 unless fume hood ventilations is connected to standby or emergency power. Requirements shall comply with City of Palo Alto Standard No. 1 UFC, NFPA Standards and will require fire department review and approval. Inspection of all aspects of fume hood installation and operation will be required by Building Department, Fire Department and Hazmat. Building/Fire Standard No. 1 Flammable Liquids in Fume Hoods FLAMMABLE LIQUIDS IN FUME HOODS Current California Fire Code, Section 8001.4.4 requires equipment utilized for dispensing, use or handling of hazardous materials shall be approved, listed, or designed in accordance with approved standards for the intended use. Listed fume hoods are presently unavailable due to the impracticality of testing myriad combinations of liquids in conjunction with fume hood use. The intent of this document is to establish a set of standard conditions of approval for typical vessels used in fume hoods and the fume hoods themselves for research processes and similar activities involving stirring, mixing and/or heating of flammable or combustible liquids. Activities where use of flammable liquids is limited to incidental activities such as cleaning using small quantities (example: squirt bottle) will be exempt from the following requirements. For purposes of this standard, workstations within Group H, Division 6 Occupancies constructed and maintained in accordance with Article 51 of the Uniform Fire Code will not be considered fume hoods. NEW CONSTRUCTION New installations of fume hoods where flammable liquids are used shall be required to have all of the following” 1. Sprinklered Buildings - A sprinkler heard shall be provided within the fume hood to cover the workbench. The sprinkler head shall be listed corrosion resistant or adequately protected by an approved method such as bee’s wax coating. Non-Sprinklered Buildings – An automatic fire-extinguishing system shall be provided if the Fire Department determines that the manner of use in the hood constitutes an extraordinary hazard. 2. Lighting shall be separated from the hood interior by a vapor-tight barrier of Safety glass or otherwise approved by the Building Division. 3. Hood construction shall be noncombustible in accordance with UBC Standard 21 surfacing materials not over 1/8 inches thick, with a flame-spread rating of 25 or less are allowed in accordance with NFPA 45. 4. Ducting shall be metallic and constructed in accordance with the current California Uniform Mechanical Code Sections 505, 506 and 609. 5. Sprinklers shall be installed within ducts having a cross-sectional dimension exceeding 10 inches, unless calculations are submitted to the Fire Prevention Bureau demonstrating that a “reasonable worst case” spill scenario will not result in vapor concentration over 10% of the Lower Explosive (Flammable) Limit. Sprinklers shall be installed at 12-foot intervals in horizontal ducts and at changes in direction. In vertical runs, sprinklers shall be installed at the top and at alternate floor levels. 6. An airflow interlock shall be provided to shut off electricity and flow of flammable or combustible materials to equipment inside the hood. The interlock shall activate at >50% loss of measured airflow. NOTE: Interlock shall not be required where fume hood ventilation is connected to standby or emergency power. 7. Electrical receptacles shall not be located within the hood interior unless otherwise approved by the Building Division. 8. Electrical apparatus and appliances located within hood interior are not normally required to be rated for hazardous locations. When atypical operations involving spraying or other potentially high-hazard activities are to be conducted, the Hazardous Materials Bureau and the Building Division shall review the intended use of the fume hood and determine the classification of the interior and required ratings for electrical equipment in accordance with current California Electrical Code, Article 500. CONTINUED USE OF EXISTING FUME HOODS Where such activities are conducted in fume hoods previously legally installed (i.e. with mechanical and electrical permits), continued use of existing fume hoods not in compliance with the above guidelines will be allowed unless the Fire Marshal determines that an imminent hazard exists. Building Official Fire Marshal