Hmmm. I would not suggest it. If you develop a leak between the heater and the air plenum, you might asphyxiate people. If I had a gas dryer, I would keep a canary in the laundry room.
There is a flapper valve lever on the side that doesn't work very well.
Loaded Question. It needs to connect between the dryer and the connection to your vent.
Maybe, Home Depot.
Due to space limitations it is not possible to accommodate some of the products on the shelves in store. If a product is not available in store we suggest researching it online, in this case by typing "ex12 deflecto" into the search engine of your choice.
The front screen stops a lot. However... very fine lint will accumulate all over the room if you let it; like I do.
The 4" tubes on the top and bottom. you can see them in the picture.