onechosen1

Thanks for all of the replies guys; I am learning allot from you. The fan is about as loud as a vacuum cleaner, albeit one with a BIG motor. I hope today to try to tie a few feet of 4 inch diameter hose to the intake and see how quiet that makes it; I just need to knock it down some and it will be fine...as is, the turbine sound almost echoes in the HW heater closet.

Thanks for the reply. The fan is not screeching; I have put my hand on it when it is running and do not feel and bad vibration either. The air intake is only 3-4 inches long and opens to the back of the closet...so the turbine sound appears to be coming from the fan simply drawing air at high speed (I can muffle it with my hand by closing it slightly). That is why I think I can muffle it in the closet by attaching a good length of 4 inch wide hose running into the bottom of the closet. But I cannot do the same for the exhaust end, though the long intake draw may tend to quiet it some as well. What is this fan for? Bleeding off excess heat? A normal HW tank does not have such a fan.

Hello...I just moved into a condo that was constructed in early 2006. It has an Apollo Hydronic system. My issue is that there is an exhaust fan sitting atop the HW tank (I am told to draw excess heat off the tank per the HOA manager) that comes on for maybe 90 seconds every hour or so. It creates a loud turbine sound in the HW tank closet next to a bedroom. I intend to attach maybe 8 to 10 feet of 4 inch flex line to the air intake to muffle it down (hopefully that is okay), but it exhausts right over the window of another bedroom...fairly loudly. I assume this fan is necessary? And from what I read here, to replace this system one day would require not just $$, but a change of ducting etc? I have attached a photo. Thanks for any insight. Tim Click to Enlarge 49.74 KB