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Dana; The above 'quote' is from an earlier posting of mine to the poster" lithnights". Again,INTERIOR walls areBEST but if it really comes down to the last resort an exterior wall is ok as long as it is weather tight/insulated.
Note; the proper installation of a Return air passage via studs, joists, etc, can be done quite sufficiently air-tight if a little care is taken by the installer. And this can also be accomplished without the use of any caulking or tape,etc, by just a bit of good workmanship on the part of the installer. Panning and blocking of the joists using metal can be just as air-tight as any supply ductwork if it is done by a skilled tradesperson.
Been there , done that.
A return serves BESTwhen installed on an interior wall, but an outside wall is generally ok as long as the passage is fairly air tight or insulated.In your case it is not the best because of this leakage to the outside. area.
Dana; The above 'quote' is from an earlier posting of mine to the poster" lithnights". Again,INTERIOR walls areBEST but if it really comes down to the last resort an exterior wall is ok as long as it is weather tight/insulated.
Note; the proper installation of a Return air passage via studs, joists, etc, can be done quite sufficiently air-tight if a little care is taken by the installer. And this can also be accomplished without the use of any caulking or tape,etc, by just a bit of good workmanship on the part of the installer. Panning and blocking of the joists using metal can be just as air-tight as any supply ductwork if it is done by a skilled tradesperson.
Been there , done that.