That's because it's the envelope of the building that determines how much infiltration air will be coming in, regardless of the internal boundaries of any systems occurring within the building. It is important that you realize that the conditioned floor area you should use to select an option is the area of the whole building, not just the current system. Then select the air changes per hour option that best fits your building construction tightness and above grade floor area of the entire building. First select the appropriate Exposures Option. Select this option if you want to use Manual J's suggested air changes per hour table values. You should wait until after you have set all the inputs and options on this page for the current season before clicking this button. Season: Specifies whether this page is set for you to edit the winter or summer infiltration values.Ĭopy to Summer : Copies your selections on this page to the other season. See the Infiltration Adjustment topic for details.Ĭurrent System: Specifies which of your systems you want to edit on this page. When you enter ventilation and/or exhaust, the program's calculations may adjust the rate of infiltration to be more or less than the value you entered. Also note that if you enter a CFM value the program will show the corresponding air changes per hour value on the Miscellaneous Data report.Īdjustment due to Ventilation and Exhaust Reducing the air changes per hour value will reduce the load on the structure due to infiltration. If you enter an air change per hour value, Rhvac Online will multiply that value by the total volume of the structure and divide the result by 60 to determine the total infiltration CFM. The Winter Infiltration or Summer Infiltration page will open when you click the Select help button by either Infiltration input on the System Data page, which will let you select a recommended rate of infiltration based on the construction tightness and floor area of the building. Infiltration, Winter and Summer: Infiltration is caused by air "leaking" into the building through gaps in the envelope.
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