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bon, sludge and soot accumulations. <br /> <br /> Section ~: Approved Heater Types. After the 1st day of <br />October, 1950, no combustible material of any k~lnd shall be used, <br />burned or oxidized for the protection of trees or plants from frost <br />dam_age in unenclosed areas except oil of the type and grade speci- <br />fied in this Ordinance, or better, when used in conjunction with <br />the following binds of heaters which are the only heaters for which <br />permits may be issued hereunder: <br /> <br /> (a) University Return Stack Heater <br /> (b) Pipeline Heater <br /> (c) Xlttle Heater <br /> <br /> (d) ExchAnge Model 7" diameter stack <br /> (e) Hy-Lo 158 Special Heater <br /> (f) Hy-Lo 230 Heater <br /> <br /> (g) Twenty-four inch Lazy Flame Heater <br /> <br /> (h) Any heater equipped with a 25~ stack <br /> <br /> (i) Jumbo Cone Heater with an adapter inserted which <br /> will allow a one-half hole opening only <br /> <br /> (~) Lemora Stack <br /> <br /> None of said heaters except those specified in Subdivisions <br />(a), (b) and (l) hereof shall be operated with more than one hole <br />opening. <br /> <br /> Section 6: Exceptions. There is excepted from the operation <br />of this Ordinance and freely permitted in orchard or ~ursery heating <br />for protection from frost damage, the following: <br /> <br />(a) Briquet Heaters when used with briquets <br /> <br />(b) Natural gases <br /> <br />(o) Liquid petroleum gases <br /> <br />(d) Electricity <br /> <br />(e) Wind machines <br /> <br />(f) Steam <br /> <br />(g) Hot Water <br /> <br /> <br />