If you have an ERV or an HRV, you need to do regular cleaning and maintenance. Here we are showing you an ERV (energy recovery ventilator). Essentially an ERV brings fresh air from outside to transfer through duct work and go through your furnace to be conditioned. Like every other system in your house, there are always maintenance tasks involved with it. The ERV system can accumulate a lot of dust, debris, insects and dander over time. This is to ensure the air entering your house is clean and