12/31/2022 0 Comments How to balance lifebreath erv![]() ![]() The International Residential Code (IRC) ventilation requirements and the ASHRAE 62.2 residential ventilation standard are the two most common methods for setting ventilation rates in U.S. By factoring in the volume of the house, we can convert cubic feet per minute to air changes per hour (ACH). ![]() When a ventilator moves an amount of air equal to the volume of the house, we say it has accomplished one air change. In the U.S., we use cubic feet per minute (cfm) to specify airflow rates, but we can convert that into a number more meaningful for the size of the house being ventilated. Ventilation Rates Required by Codes and Standardsįirst, let’s get units out of the way. The two steps to sizing an ERV are deciding what you want the continuous ventilation rate to be and then deciding what size ERV you’re going to get to provide that amount of ventilation. How much air are you going to move through the system? When we talk about sizing any type of ventilation system, the relevant quantity is the airflow rate. Because it has balanced supply and exhaust airflows and because it recovers heat (ERV and HRV) and moisture (ERV), it also happens to be the most efficient type of ventilation system for homes. An ERV is one of many devices that ventilates by bringing outdoor air into a house. More ventilation is often better as long as it is balanced and recovers some heat and moisture.Īnd before that, we have to talk about what “sizing” means in the context of ERVs. Geoff Ferrell/Mandalay Homes Unlike a heating and cooling system, oversizing an ERV is not a problem, and even preferred. ![]()
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