attic fan making noise

Just got a new attic fan from a guy who replaced my duct work, the old fan was burned out and he replaced it. Anyway 1 month later its making noises like the bearings are going. He came over and sprayed WD40 on it and quieted down for acouple of hours and now its make to making noise.
Is there something else I can use to quiet it down or should I put some pressure on this guy to replace it. He's just saying "I'm just the installer, I'm not paying for the fan" then he says who's going to pay me for the labor?
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John H. wrote:

Hi, No warranty? Shoulc be covered by warranty. Tony
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If it is new, it should be covered by some sort of warranty. Labor may not be though. WD-40 is a rather poor lubricant and is temporary. You need a real oil, something like 3 in 1 that will last in a motor. Sounds like a defective bearing.
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John H. wrote:

Take your loss. He is responsible but getting him to replace is likely to be a hassel. This guy doesn't know what he is doing as evidenced by spraying WD40 on it. He probably suckered you with a used fan that he got for nothing. It is likely repairable by taking the the motor out, cleaning the gunk out of the bearings (you can do that with WD40), and replacing any fiber washers with nylon or stainless steel washers, and using a good oil (turbine oil). If you don't want to do that, get another person to install a new fan, or buy a fan and install it yourself.
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