how would you describe this,
on the outside is a cold air register cover, on the inside this line extends from the duct line of the furnace
Im thinking that this was to bring fresh air into the home?
this line extends to the exterior right above a dryer vent
The dryer vent is to close to the supposed fresh air vent, as fresh air vents in our area usually have a different cover when outside, not an interior cold air return register cover, which is pictured and was under an over hang on a house resently inspected.
according to the N.B.C. outside air is supposed to be brought in to the main pleum, and not to a distribution duct, as done in the picture.