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` 'City of Sammamish * Residential Energy & Ventilation Complian9orm Pag&q-of D- <br />The whole -house mechanical ventilation system is permitted to operate intermittently where the system has controls that enable operation for not <br />less than 25 percent of each 4-hour segment and the ventilation rate prescribed in Table M150733(1) is multiplied by the factor determined in <br />accordance with Table M1507.3.3(2) <br />MODIFIED TABLE M15073.3(1) <br />INTERMITTENT WHOLE -HOUSE MECHANICAL VENTILATION SYSTEM AIRFLOW RATE REQUIREMENTS <br />Using Table M150733(2) Factor of 4 for 25% <br />DWELLING UNIT FLOOR <br />AREA (square feet) <br />NUMBER OF BEDROOMS <br />0-1 1 2-3 4-5 1 6-7 >7 <br />AirftoW in CFM <br />< 1,500 <br />120 <br />ISD <br />240 <br />300 <br />360 <br />1 501- 3,000 <br />ISO <br />240 <br />300 <br />360 <br />420 <br />3 001- 4 <br />240 <br />300 <br />360 <br />420 <br />480 <br />4 501- 6.000 <br />300 <br />360 <br />420 <br />480 <br />540 <br />6,001- 7,500 <br />360 <br />420 <br />480 <br />540 <br />600 <br />> 7,500 <br />420 <br />480 <br />540 <br />600 <br />660 <br />MODIFIED TABLE M1567.3.3(1) <br />INTERMITTENT WHOLE -HOUSE MECHANICAL VENTILATION SYSTEM AIRFLOW RATE REQUIREMENTS <br />Using Table M150733(21 Factor of 3 for 33% <br />NUMBER OF BEDROOMS <br />DWELLING UNIT FLOOR <br />AREA (square feet) <br />0-1 1 2-3 4-5 6-7 1 >7 <br />Airflaw in CFM <br />< 1,500 <br />90 <br />135 <br />180 <br />225 <br />270 <br />1,501- 3 00 <br />135 <br />ISO <br />225 <br />270 <br />315 <br />3,001 - 4 0 <br />180 <br />225 <br />270 <br />315 <br />360 <br />4,501- 6,000 <br />225 <br />270 <br />315 <br />360 <br />405 <br />6,001- 7,500 <br />270 <br />315 <br />360 <br />405 <br />450 <br />> 7,500 <br />315 <br />360 <br />405 <br />450 <br />495 <br />MODIFIED TABLE M 1507.3,3(1) <br />INTERMITTENT WHOLE -HOUSE MECHANICAL VENTILATION SYSTEM AIRFLOW RATE REQUIREMENTS <br />Using Table M15073.3(2) Factor of 2 for 50% <br />DWELLING UNIT FLOOR <br />AREA (square feet) <br />NUMBER OF BEDROOMS <br />0-1 1 2-3 4- 5 6- 7 > 7 <br />Airflow in CFM <br />< 1,500 <br />60 <br />90 <br />120 <br />ISO <br />180 <br />1,501- 3,000 <br />90 <br />120 <br />150 <br />1E0 <br />210 <br />3 001-1 500 <br />120 <br />ISO <br />ISO <br />210 <br />240 <br />4 501-6 000 <br />1 150 <br />180 <br />210 <br />240 <br />270 <br />6,001- 7,500 <br />180 <br />210 <br />240 <br />270 <br />300 <br />> 7,500 <br />210 <br />240 <br />270 <br />1 300 <br />1 330 <br />MODIFIED TABLE M15073.311) <br />INTERMITTENT WHOLE -HOUSE MECHANICAL VENTILATION SYSTEM AIRFLOW RATE REQUIREMENTS <br />Using Table M1507.33(2) Factor of 1.5 for 66% <br />DWELLING UNIT FLOOR <br />AREA (square feet) <br />NUMBER OF BEDROOMS <br />0-1 1 2-3 4-5 1 6-7 1>7 <br />Airflow in CFM <br />< 1,500 <br />45 <br />67.S <br />90 <br />122.5 <br />135 <br />1,501- 3,000 <br />67,5 <br />90 <br />112.5 <br />135 <br />157.5 <br />3,001- 4,500 <br />1 90 <br />112.5 <br />135 <br />157.5 <br />180 <br />4,501- 6,000 <br />1 112.5 <br />135 <br />157.5 <br />180 <br />202.5 <br />6,0D1- 7,500 <br />1 135 <br />157.5 <br />1so <br />2025 <br />225 <br />> 7,500 <br />1 157.5 <br />180 <br />202.5 <br />225 <br />1 247.5 <br />MODIFIED TABLE M15073.3(1) <br />INTERMITTENT WHOLE -HOUSE MECHANICAL VENTILATION SYSTEM AIRFLOW RATE REQUIREMENTS <br />using Table M150733(2) Factor of L3for 75% <br />DWELLING UNIT FLOOR <br />AREA (square feet) <br />NUMBER OF BEDROOMS <br />0-1 1 2-3 1 4-5 6-7 >7 <br />Airflow in CFM <br />< 1,500 <br />39 <br />58.5 <br />78 <br />97.5 <br />117 <br />1,501- 3,000 <br />S8S <br />78 <br />97,5 <br />117 <br />136.5 <br />3,001- 4,500 <br />1 78 <br />97.5 <br />117 <br />1365 <br />156 <br />4,501- 6,000 <br />97.5 <br />117 <br />136.5 <br />156 <br />175.5 <br />6,001- 7,500 <br />117 <br />136.5 <br />156 <br />175.5 <br />195 <br />> 7,500 <br />136.5 <br />156 <br />175.5 <br />195 <br />214.5 <br />