A. 
Ventilating systems shall be installed and maintained so that the rapid spread of heat, flame or smoke through the system will be prevented and so that under conditions of use the temperature of any combustible material adjacent thereto or in contact therewith will not exceed a safe temperature.
B. 
Stairways, passageways, exits, shafts, hoistways or attics shall not be used as plenum chambers.
C. 
Ducts shall be securely fastened in place and appropriately firestopped.
D. 
Ducts and other air-handling equipment shall be of noncombustible material.
E. 
Filters shall be installed and maintained so as not to constitute a fire or smoke hazard.
F. 
Ducts passing through or located within combustible construction shall be separated from such construction by a clearance of at least one-half (1/2) inch or by a noncombustible insulating material at least one-fourth (1/4) inch thick.
G. 
Air required for ventilation shall be taken from the exterior or shall be quality-controlled.
H. 
Exhaust air from a dwelling unit or a space whose contents may emit odors, fumes or vapors shall not be circulated to other occupied spaces within the building.[1]
[1]
Editor's Note: Former §§ 80-69, Air-intake and exhaust openings in multiple dwellings, 80-70, Ventilation of enclosed and public spaces in multiple dwellings, and 80-71, Safety controls in multiple dwellings, and Articles XIV, Fuel Oil (§§ 80-72 through 80-74), and XV, Fire Protection in Multiple Dwellings (§§ 80-75 through 80-78), which immediately followed this subsection, were repealed 9-28-1993 by L.L. No. 23-1993 and 11-8-1993 by L.L. No. 28-1993.