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c : ; _._~... r . September 30, 1980 Mr. Lawrence G. Spi~elvogel, P.E. Lawrence G. Spielvogel, Inc. Consulting Engineers Wyncote House Wyncote, PA 19095 Subject: Response To Your Comments On ASHRAE Standard Draft Revision 62-73R, "Standards For Ventiliation Required For Minimum Acceptable Indoor Air Qual'ity", January 15, 1950 Dear L arry, Thank you for your comments of June 27, 1980 on the draft of ASHRAE Standard 62-73R which was on public review. The committee has reviewed your comments and has recommended the following action based on your letter: (Not To Accept Your Suggestion). Section 5.1. Provisi'on for airflioww measurement requirement is recommended (as good practice) when mechanical ventilation is used. Your comment suggests specific techniques be mentioned. The Standard is not a textbook or handbook, and to suggest such techniques applicable to the many possible different prospective air systems and'their ductwork would be, I'm sure you will agree, a voluminous list. (In some cases a punched hole, well-located , would be sufficient for a pitot tube measurement in a small duct.) (No Action Required). Section 5.7. The requirement that the combustion air rate be demonstrable when infi tration is relied on, is felt necessary due to the great reduction in infiltration being achieved by many energy-conserving house construction techniques. It is intended to act as a warning flag, f or even in not-too-tight houses in windless cold weather, sufficient infiltration may not get to the furnace compartment. Appendix B amplifies this oi t,,,-0~'7~5ti,) 8 (To Accept, And To Make A Clarifilcation). Table 3. The requirements for outdoor air in Table 3, f or smoking and non smoking, are based on a consensus of experienced professionals. There was much consideration of the entire experimental and research literature by the project committee in arriving at the rates in Table 3. It would seem the relative simpl1city of the listed specific quantity f or a specific occupancy meets the goal of your closing statement which correctly points out the need of simplicity in a document : _ ~ .. 1301 E-' STi .. _ .C. ti : T'J1 :JQ iA.M~.D.', :)i::Tk_._ .. .'•N C.FriC?I 13- A:__'.i 4

Mr. Lawrence G. Spi'el gel!, P.E. September 30, 1980 Page 2 C whose data may be used by many people without specific experience in this field. With ref erence to your comment relative to mixed smoking and non-smoking occupancy: the quantities were a consensus of professional judgment arrived at by considering research data that about one in four occupants of a space is a smoker, that his average smoking rate is about two cigarets per hour, and:that about 95 cubic feet of ventilating air is required to properly dilute the contaminants from one cigaret. The text will be clarified to point out (Li'ne 7 page 22) "When smoking is allowed in occupied spaces supplied by a system the amount of outdoor air required shall be determined from the "Smoktng" column of Table 3. However, any areas within the space which are designated as non-smoking may have their outdoor air requirement determined from the "Non-Smoking" column of Table 3, provided that no air is recirculiated from or otherwise enters from the smoking areas." (Not To Accept Your Suggestion). Table 3. The residential occupancy d'iffers from the other occupancies in that the public is not involved in what happens in one's home. If the resident is a smoker, he can tolerate some smoke in the interior; and if he is not, he still needs the amount shown as a reasonable dilutant f or any of many possible household air contaminants. (No Action Required). General Comment. The Standard's alleged added complexity really only off ers an a ternative for a future "performance" type approach as well as the traditional "prescriptive" approach to ventilation standards. Only this way can we work toward improvement of our criteria. Adoption of this Standard in Energy Conservation Standards can, we feel, be made with confidence. I hope this discussion has clarified the committee's intent. If I don't hear from you by October 10, 1980, the committee will assume that your comments have been resolved to your satisf action. Very truly yours, P" Frederick H. Kohloss Member, ASHRAE Standards Project Committee 62-73R cc: SPC 62-73R Members I i i