What is an exhaust enclosure?

Such enclosures include laboratory hoods, exhaust fume hoods and similar appliances and equipment used to retain and exhaust locally the gases, fumes, vapors and mists that could be released. Rooms or areas provided with general ventilation, in themselves, are not exhausted enclosures.

Where are gas cabinets & exhausted enclosures found?

Gas cabinets and exhausted enclosures are found in many of our client’s facilities, primarily in semiconductor fabrication and research laboratories. The appropriate amount of airflow is not always obvious to the designer.

How do you ventilate a CFM / sq ft enclosure?

The two code-required approaches to satisfy the ventilation requirements are to continuously ventilate the space at 1 cfm/sq-ft or intermittently ventilate the enclosure as needed by monitoring and limiting H 2 concentration to not exceed 25% of LEL.

What are the ICC ventilation requirements for exhausted enclosures?

ICC ventilation requirements for exhausted enclosures are appreciably different than we use in chemical fume hood design; the IFC requires 200 feet/minute through the open face of the enclosure.

Does UMC address battery room ventilation?

The Uniform Mechanical Code (UMC) does not directly address battery room ventilation but specifies that if a proposed occupancy is not listed in Table 4-4, the requirements for the listed occupancy that is most similar to the proposed space in term of occupant density and occupancy type shall be used.

What is an example of an exhausted enclosure?

Common example: Valve manifold box (common in semiconductor industries for gases and liquids) or a paint booth Odd example: Chemical fume hoods in laboratories – though described as an exhausted enclosure in both ICC and NFPA, we do not treat them as exhausted enclosures