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Hi, I'm Mike G and I'll be assisting you. Let me first ask, how far is the venting from the fan to the exterior? The length of the run makes a major reason for lack of air flow.
That is an excessive distance for venting. Is there a closer location for the exit of the venting?
I'm going to opt out and put your question in the HVAC catagory. Your situation requires an air flow calculation to size the cfm required.
Just stand by and an HVAC expert will take your question. Heating Ventilation Air Conditioning.
Do you have an actual model on the exhaust fan assembly? Is that one of numbers above?
Perhaps I can help. The problem you describe is fairly common and so is a possible solution. Unless the bathroom is (very)large most bathroom exhaust fans will do the job. The problem is that folks expect the fan to evacuate the moisture in the room with the door closed. The only way an exhaust fan (even a much larger capacity fan) can move the air in the room out is by drawing more air in. If the only place the fan has to pull air from is a very small (or no) gap under a closed door then it can't do its job very well if at all. So if the door is left partially open or the gap under the door is bigger then the fan can draw enough air into the bathroom so it can get the too moist air in the room out. If the fan still doesn't work even with the door wide open then you'll need to install a larger capacity fan. Just putting a bigger motor in the fan (if you could find one that fit) won't solve the problem.
Yes, a fan with a higher capacity fan which means bigger fan and motor. One other thing to check before you replace this fan; is it possible the vent is blocked? are you sure there is air coming out of the vent termination outdoors?
It's not uncommon for water to get trapped in the vent which blocks the air flow. This is particularly a problem when plastic dryer vent hose is used instead of metal vent piping. The vent hood termination outdoors usually has a flapper that will blow open if air is moving. If your's has a flapper and you can see it but it doesn't move then you could have a blocked vent. If that's the case you need to address that first. it may even solve the problem.
Since you've determined that the vent is open your next step would be to install a bigger exhaust fan but it also sounds like your dryer is not vented properly. The dryer should put no moisture in the room if it's vented proeprly
The motor specs above don't tell me what I need to know. I need the size of the room and also need to know where you live since labor costs vary quite a bit around the country. I also need to know is the fan buried in the ceiling?
What size pipe is currently connected to this fan? And is it possible to run larger if needed?And what is model on the actual exhaust fan (Not motor)?