Modern Aire PSL 600, damper or backdraft damper?
I know I read a discussion here or on the kitchen forum about something that goes on the roof and makes a bend downward to keep air from making the damper flap when the wind blows. But I can't find it.
I already have the PSL 600, and the HVAC guy came today to see what was needed to put in the duct. I don't know how many, if any, of these he has done. He sure seemed to write a big supply list before he left: (2) 12" adapters (I think it was adapter he wrote), 10' of 8" single thickness duct, damper, roof housing, and flashing.
I asked him what kept the damper from flapping and he said he didn't know.
I asked him what kept water from condensing in the vent pipe and he said the blower would remove all the moisture so there wouldn't be any to run back in.
I asked him if the duct they installed would fit inside the collar on the liner, or on the outside and he said it didn't matter, we would just screw the two together whichever way it fit best.
Does all this seem right to those of you who have been through it?
This was the ONLY place I found who would install the ductwork, so I don't have a lot of options about who does it, but I can give them as much information as I can find.