Secure dryer vent in hole in floor?

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Old 12-06-17, 07:44 AM
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Secure dryer vent in hole in floor?

I'm usually semi rigid venting (UL listed) in the crawl space under the house. This goes up through the floor in a 4" hole. How can I secure the union pipe in the floor space so it doesn't fall - is there a UL approved glue or PL?
Secondly, why is transition duct made of aluminium foil allowed for dryers at floor level? Isn't this a fire risk? Shouldn't this be semi rigid or rigid pipe also?
 
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Old 12-06-17, 07:55 AM
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The aluminum duct is considered semi rigid... not like the plastic pipe with the wire. You can use a 4" start collar and a male coupling... Use foil tape to secure the joints.
 
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Old 12-06-17, 08:20 AM
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It's where it guess into the floor. If I disconnect the dryer then the vent below the floor falls down.
The transition is aluminium flex.
The crawl space would be semi rigid.
 
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Old 12-06-17, 08:50 AM
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Disconnect it from the dryer, use foil tape to connect the duct to a start collar or takeoff flange. Drop the start collar into the floor. The flange prevents it from falling in. Then insert a male coupling (or elbow) into that.
 
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