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Poor air flow is a very common trouble maker for slow to dry or poor heat complaints. Just sticking your hand under the vent hood and saying "I feel air" is not enough. Always check/change/shorten the venting and vent hood first, then check air flow in your dryer. The dryer is full of air vents and ducts that must be cleaned/checked as well. They could be in the door, on the back of the inside of the drum. A loose or clogged fan blower can also effect air flow. Poor/loose/worn drum seals will stop proper air flow as well.
I was on a service call and found this problem...even after I suggested the customer check the venting/dryer air ducts/lint filter before we look at the dryer. "Everything is good" is what they told me..... guess again.....this is what I found.....
Not much air flow through that grill. Looks to be approx 1/2 plugged :-(