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People underestimate how critical proper venting is for the Dryer (and refrigerator).

Are the clothes in your dryer taking too long to dry? Do you want to increase the efficiency and effectiveness of your dryer by speeding up drying time? Do you want to save on your energy bills for the-long-hall

Most people don’t realize how critical the vent is in the drying process. Trying to dry clothing while having a clogged or constricted vent hose is similar to trying to dry a wet shirt in a closed plastic bag, it will not work.

Most folks also do not realize that it is very common for vents get squeezed and kinked behind the typical dryer. Once this partial constriction happens, it is only a matter of time that lint will start accumulating inside the vent-hose and dryer. This obstruction will invariably cause a cascading problem inside the dryer as well as increase your gas and electric bills and prolong the drying time of the wet clothes you just took out of the washer and are eager to put away.

The best way to maximize efficiency and prevent future problems is to keep the dryer vent clear of obstructions (and of lint). By the way: Since we are talking about obstructions to air-flow, this brings to mind another appliance: The refrigerator. Please see the bottom of this page to read about a similar preventative maintenance issue

A normal load should take 45 minutes to dry.

First, verify that the heating of the dryer works: Is the dryer flame igniting -when the heat runs on gas. With an electric dryer run the dryer with a light load for a couple of minutes and notice if the cloths feel warm?

If your dryer is heating but is taking a long time for the clothing to dry frequently this could be a result of an obstruction to the dryer vent, or an obstruction at the very end of the vent where it opens to the outside. The flap could be stuck, there could be a wire mesh that is plugged with lint, or even a bird or something else could be causing an obstruction.
Before you even begin to look at the vent, the simplest way to test to determine if the vent is the culprit, is to remove the vent hose from the back (or side) of the dryer and then run the dryer with a regular clothing load in it. See if this solves the problem. If it does, then you know that there is an issue with the vent. Important safety note with gas dryers: keep a window/door open for ventilation. When a dryer runs on gas and the vent is removed, the dryer will release carbon-monoxide into the air so please use proper caution.


It is a good idea to check: 
A. the 4 inch vent hose behind the dryer for kinks
B. The vent outlet (located outside the house) for an obstruction.
C. If there was an obstruction, there is most likely a lint buildup inside the hose and the machine.
D. The inside of the drying machine should be checked for a lint buildup also, especially if the exhaust line was obstructed and blocked in any way since this could pose a safety and fire hazard. 
Some dryers have access panels that make it easier to get a peek inside. I would recommend writing your model number down and then checking online for a diagram of the placement of the access panels
Related: The refrigerator has a part that functions similar to the dryer vent. It releases heat into your home when a fan blows air against hot coils. Like the dryer -the modern refrigerator-  is often boxed in. While these are two very different appliances that work very differently both share a similar preventable problem: “Poor air-flow after a preventable obstruction”
To read the full article about the refrigerator-freezer condenser please follow this link
FYI There are specifically designed brushes for cleaning both the refrigeration condenser coil and the dryer vent. These can  be obtained through appliance part distributors and online
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