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' 33 RESIDENTIAL ENERGY CQDE a322.2I04 <br /> Equation ]l-1: <br /> Totai ventiIatian rate(cfm) _ (Q.02 x square feet of <br /> �onditioned space�+ <br /> [15 x(number of bedroqms+ 1)] _ . <br /> Nl t 04.2.1 Continuous ventilation. A minimum of 50 percent of the totaf ventilation rate,but <br /> not less than 40 cfm, ahalI be pravided, on a continuous rate average for each one-hour period <br /> eccording to Table NI l 04.2 or Equation I 1-2. The portion pf the mechanical ventilation sysiem <br /> that is intended to be continvous may have autpmatic cycling controIs providing the average flow <br /> rate for each hour meeting the requireme»ts of Section N 1]Q4.Z.]. <br /> Equation ]1-2: <br /> Continuous ventilation(cfrn) = total ventilation ratel2 <br /> NI104.2.1.I Ventilation rate. '1'be coniinuous ventilation system shall be balanced in <br /> accordance with Section N 1 J 04.4.2. <br /> Exceptiore: ]f the locai ventilation requiremetris according to IRC Section R303.3 are being met by <br /> the continuous ventilation system,it sha11 be capable of operating at a rate not more than ]00 percent <br /> greater than required by Section N]104.2.]. <br /> N110�.2.21ntermittent ventilation. The difference between the tota!ventilation rate and the <br /> continuous ventilation raie shall be based on flow raies as designed or as installed. <br /> Table N 1104.2 <br /> Total and Continuous Ve»tilation Rates (in cfm) <br /> Number of Bedrooms <br /> l 2 3 a 5 U, <br /> Conditioned <br /> space' (in sq, Total/ Tota1J TotaV Toial/ Total/ Totai! <br /> ft.) Continuous Continuous Continuous Continuous Continuous Continuous <br /> 1000-]SQO 60/40 75/40 90/45 JOS/53 I2fl/6p ]35/68 <br /> ]SQI-2�00 70/40 85J43 100/SU lI5/58 730/65 ]45�73 <br /> 20U]-2500 80/40 95/48 l 10/55 125/63 I40/70 ]55/78 <br /> 25d]-3000 90/45 ]OS/53 l20/60 135168 I50/75 ]65/83 <br /> 304]-350a ]00/50 1I5/58 ]30/65 145/73 16Ql8Q 175188 <br /> 3501-40t� l]O/55 l25/63 ]40/70 I55/78 170185 l85/93. <br /> Copyright m2009 by tbe Rovtsor of Ststutes.State of Minnesata. Al!Rights Reserved, <br /> . \ <br />