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Question about Whirlpool Dryer venting

I've bought a new house and the dryer venting is already installed. However, upon inspection I've found there are 6 elbows between dryer hook up and vent outside and it starts at 4" and goes down to 3". This doesn't seem quite right. My questions; Is it safe to reduce to 3" on the venting? How many elbows (90 degree) can the vent pipe have in order to be safe and what is the maximum length of venting pipe that can be used between the dryer and the vent outside? Is there I place on the net where I can print specks for proper installation of this machine? Thank you so much!

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Whirlpool Dryer was running very hot. Now it won't turn on. when turning dial to select dry cycle there's an audible hum. Upon inspection of the interior one of the vents appears singed/burned.


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