National Fire Protection Association (NFPA) 90A - 02, Standard for the Installation of Air-Conditioning and Ventilating Systems, makes which of the following statements regarding cleaning?
A.
Cleaning should be undertaken yearly
B.
Cleaning should never be undertaken
C.
Cleaning should be undertaken once every five years or sooner
D.
Cleaning should be undertaken whenever an inspection indicates the need
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8 months, 4 weeks ago