It is unlawful for any person, firm or corporation to use, light or burn, or permit or cause to be used, lighted or burned for the protection of crops from frost or freezing, any heating device which produces unconsumed solid carbonaceous matter at a rate in excess of one and one-half grams per minute; provided however, that multiple-acre heating devices which produce unconsumed solid carbonaceous matter at a rate in excess of one and one-half grams per minute shall be permitted so long as such multiple-acre heating device does not produce unconsumed solid carbonaceous matter at a rate in excess of seventy-five grams per minute per acre and provided that not more than one of such heating devices be permitted for each acre to be heated.
(Ord. 729 § 5, 1966)