4fantech4Room classification Number of rooms CFM (L/s) CFM RequiredMaster bedroom x 10 L/s (20 CFM) =Basement yes or no =Bedrooms x 5 L/s (10 CFM) =Living room x 5 L/s (10 CFM) =Others x 5 L/s (10 CFM) =Kitchen x 5 L/s (10 CFM) =Bathroom x 5 L/s (10 CFM) =Laundry room x 5 L/s (10 CFM) =Utility room x 5 L/s (10 CFM) =Total Ventilation Requirements (add last column ) =if yes add 10 L/s (20 CFM)if no = 01 CFM = 0.47 L/s1 L/s = 2.13 CFMRoom Count MethodDetermining your airflow requirementASHRAE methodVentilation Air requirementsFloor area Bedrooms0-1 2-3 4-5 6-7 >7Ft2 m2 CFM L/s CFM L/s CFM L/s CFM L/s CFM L/s< 1500 <139 30 14 45 21 60 28 75 35 90 421501-3000 139.1-279 45 21 60 28 75 35 90 42 105 503001-4500 279.1-418 60 28 75 35 90 45 105 50 120 574501-6000 418.1-557 75 35 90 42 105 50 120 57 135 646001-7500 557.1-697 90 42 105 50 120 57 135 64 150 71>7500 >697 105 50 120 57 135 64 150 71 165 78* ASHRAE 62.2-2010 Table 4.1, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings.Bathroom: If the ERV is going to provide the required local exhaust ventilation for each bathroom with each a continuous 20 CFM(10 L/s), this ventilation rate can be considered as part of the whole-building ventilation rate.