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Mr. Dean Pittman <br />Page Two <br />j�Z�Zy pril 5, 1976 <br />U. M. C., Section 704. 5, and U. B. C., Sections 708 and 1108 <br />These sections relate to heating systems or central heating plants, <br />such as boilers and ducted forced -air comfort heat (central) furnace systems, <br />not to make-up air heaters as covered in Section 1904 of the U. M. C. <br />1976 U. M. C. Revisions <br />The 1976 Uniform Mechanical Code will incorporate a revision to <br />Section 1904 that will remove occupancy restrictions, except for sleeping <br />facilities, when an approved testing agency has indicated that certain sections <br />of ANSI Standard Z83.4 have been met. This does not require listing, but <br />allows a Building Official to require sufficient test data and controls require- <br />ments to insure a safe installation. <br />These (Rupp Temp -Air) direct -fired make -up -air -heaters have been <br />approved by Seattle normally with an interlock between the exhaust fan motor <br />(relay) and the gas valve controls of the make -up -air -heater. <br />I hope this answers your questions relative to this and similar installa- <br />tions. If I can be of further service, please call me at 622-6767, Ext. 461. <br />Sincerely, <br />Tack O. Wood <br />Staff Engineer <br />Codes & Ordinances <br />