2004.1 Intake and exhaust air ducts shall be cleaned and filters changed so they are not a source of contamination by dust, dirt, and other materials.

2004.2 If vented to the outside, ventilation systems shall not create a public health hazard or nuisance, or unlawful discharge.

SOURCE: Final Rulemaking published at 56 DCR 5245 (July 3, 2009).