Photo: Any guesses as to what that object sticking out of the vent is?
Photo: It looks like someone was in the middle of a rehab, doesn't it? They weren't. This was a bank-owned property, and the whole house looked like this.
Photo: This opening at the exterior of the house is the combustion air intake. It supplies air to the house to help make sure there's enough combustion air for things like the furnace and water heater. When the clothes dryer, bath fans, and kitchen fan are running, it also serves as a make-up air intake.

It's not supposed to be covered with duct tape.
Photo: Wet crawl space, manufactured home. Everything was literally dripping with water because there was improper grading at the back of the home, and there was standing water on the crawl space floor.

The listing agent told the buyer that all she needed to do was add insulation to the pipes and this problem would go away. I told the buyer "that's absurd."
Photo: Years of dryer lint accumulation in a crawl space from a disconnected dryer duct.  Dryer lint is flammable, so someone needs to clean up this mess.  The insulation needs some work as well.

If you have a dryer duct that passes through a concealed space or an infrequently visited space, such as a crawl space or attic, you would do well to check on it periodically.
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Structure Tech Home Inspections
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This opening at the exterior of the house is the combustion air intake. It supplies air to the house to help make sure there's enough combustion air for things like the furnace and water heater. When the clothes dryer, bath fans, and kitchen fan are running, it also serves as a make-up air intake.

It's not supposed to be covered with duct tape.

3 plus ones