![]() If they were blocked from opening when the ducting was installed then the fan may be blowing. It also helps with steam in the bathroom. There usually are dampers where the exhaust blows from the motors. An exhaust fan sucks dust and air into it, removing it from the air you breathe. The general rule of thumb on as far as fentilation goes is to have an intake roughly double the size of your exhaust. Wanting to know more about an exhaust fan. crack a few windows in your garage or something along those lines, just make sure you have a way for air to come in as well as out. 15 January, 2011 in Engine, Transmission and Exhaust. With no way for clean, fresh, outside air to get into your grow room when your fan turns on you wont really be exhausting anything just creating turbulance within your attic/growroom. Have just noticed tonight that there is a sucking or blowing noise coming from the engine bay area. gasses that the water heater may cause.Īlso as other people have posted you need passive ventilation for any kind of exhaust fan to work properly. Once your grow room fan kicks on creating that negitive pressure it will suck the flap closed and not let any outside air come in, and with no air comming in you will not get any back flow of misc. ![]() When the water heater fan is not on gravity will close the flap. You would install it inline with the water heater exhaust so that when the exhaust from the heater turns on the pressure in the ducting will push open the flap and let the exhaust out. As far as a back draft damper goes, it only works one way.
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