Kenmore series 90 electric dryer: exhaust air is

That's normal,obviously you haven't cleaned out your dryer and vent line,nobody ever tells the customer when you buy your dryer that it should be cleaned out at least once a year so you don't have a fire more so if it's a gas dryer with an open flame inside the dryer,you gotta vac out the inside where the motor is,clean out the duct that the lint filter slides into and blow out the vent line,i use a leaf blower to clean out the vent line,take it off the back of the dryer,stick the leaf blower in the line if it's a long run if it runs through the wall and to the outside flapper and blow all the **** out of it,also if you have a shop vac put it on blow and blow off the motor,you won't believe how much lint comes off the motor even though it looks clean,so vac out the inside of dryer,clean out the lint filter duct and blow out the vent line