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1

To me it sounds like you removed the back draft damper that may have gotten stuck.


0

Obviously this fix won't apply in all cases, but it's something to check for. Searched around for some answers, and noticed some advice about the exhaust duct being too small. With the fan out, I felt for the duct to see how big it was, and a piece of rubber came out, around the same size as the duct. Possibly something cut out for the duct 45 years ago ...


4

More than 20 feet of flex pipe is a problem - 20 feet of flex pipe, uninsulated, sloped so it drains back into the fan is a huge problem. Flex pipe has VERY high resistance to airflow compared with smooth duct. It should be avoided, or if its absolutely unavoidable it should only be used for very short sections where regular fittings will not work. I don't ...


1

There are three reasons why whole house fans generally vent into attics. First, whole house fans are designed to pull air from the highest point in the living space of a house, which is generally where the warmest air collects. This removed air is replaced by cool air entering windows in the first floor, flushing the warm air out of the house. The highest ...


1

As was said in the comments on your question, you get additional efficiency by clearing hot air in the attic in the process. Your house air is maybe 75-80* F, while your attic can be 100* or more. Ventilating the home and the attic results in greater overall cooling by reducing heat that would conduct back through any attic insulation. I assume here that ...


-1

Depending on your climate, venting a bathroom or other house fan to the attic is a very bad idea. If you live in a cold climate (outside temp lower than room temp), the colder attic will cause condensation of the warm moist home air or even freezing of the water vapour in the attic, potentially leading to mould or rot of the wood, or ice in the attic ...


0

The bearing and fan should align and run in the same position irrespective of how the fan is mounted. It will align in the opposite direction to which the air is being pushed. The air is being forced out, the fan is being forced in. Newtons 3rd law.



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