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If a mechanical ventilating exhaust system is required in any room, air may be exhausted to corridors or uninhabited rooms through direct openings or horizontal ducts not to exceed 5 feet (1525 mm) in length if all of the following requirements are met:
1. The room being supplied does not contain dangerous or noxious fumes, odor or dust; and
2. Adequate relief openings for mechanical exhaust exist in such corridors or uninhabited rooms.
For the purpose of all garage ventilation requirements found in Table 18-28-403.3, the following rules shall apply: If a building is used for active storage of cars only, relief openings may be located in walls, areaways or roofs. If the garage is capable of accommodating six cars or more and is used for active storage of cars only, the required air supply may be unheated.
(Amend Coun. J. 3-29-17, p. 45477, § 12)
If a room is used for two or more purposes, each of which is subject to different ventilating requirements, and it is possible to determine the space which will be used for each purpose, then each such space may be considered as a separate room and ventilated in accordance with the table of ventilating requirements applicable to that room. If it is not possible to determine the space which will be used for each purpose, the most restrictive, applicable ventilating requirements shall apply to the entire room.
If a partition stops at a distance of 2 feet or more below ceiling level, the partition shall not be considered to form an independent room; the space on both sides of the partition shall be considered to form one room. A grille with an opening of not less than 75 percent free area may be placed in the 2 feet space. Door height shall not be considered to be part of the partition.
If a mechanical ventilating system is used in a public garage, the system shall not be required to operate continuously if the system is equipped with an approved detection device that operates automatically upon detection of a concentration of carbon monoxide of 50 parts per million (ppm). The minimum density of carbon monoxide detectors shall be one detector for every 5,000 square feet of garage floor area. If the general exhaust of a building is discharged into a mechanically-exhausted public garage, the garage exhaust system shall exhaust at least 100 percent of the ordinance required air.
The applicant for any permit ventilation schedule in a form substantially similar to Table 18-28-403.14 shall be submitted with permit plans to demonstrate compliance with the Ventilation Article of this chapter.
Ventilation | |||||||||||
Room Description | Ordinance Requirements | Actual Provided | Remarks/ Room Function | ||||||||
Natural Light & Ventil. (SF) | Mechanical Ventil. (CFM) | Natural Light & Ventil. (SF) | Mechanical Ventil. (CFM) | ||||||||
Room No. | Room Name | Floor Area (Sf) | Glass Area | Vent Area | Supply Area | Exhaust Air from Room | Glass Area | Vent Area | Supply Air | Exhaust Air from Room | |
– | – | – | – | – | – | – | – | – | – | – | – |
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