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In my basement, I have a gas pipe (1" diameter) running between the joists. There is a reason why I have choose this cavity to run a supply line from where. But I am end up using a end boot register which would be perpendicular to the exterior wall. I have seen in my house in the upper living area, builder used 90 degree vent register most of places and, few places the end boot register. In all case, the register vent boots is install parallel to any wall.

Would there be any problem in the air flow, if I run a supply through end vent boot which will be perpendicular to outer wall. The below is the picture I am trying to say. this vent will be just above the exterior door enter image description here

End boot register : enter image description here

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The air flow will be the same but the distribution of that air will be compromised. Supply vents up through the floor are usually aimed at the wall and air flows up the wall and into the room, the reason for them being installed parallel to the wall. It's also stands a better chance of not being obstructed by furniture in the room. A perpendicularly installed vent looses the "Wall effect" and also stands a good chance of being obstructed by furniture because it will stick out far.

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  • Thanks Jack. If furniture is not a concern as the end boot is just above an exterior door. How the air will be compromised here ?
    – PAN
    May 31 '21 at 4:52
  • Does this vent supply air to the basement or first floor? the exterior door in the basement threw me.
    – JACK
    May 31 '21 at 12:45
  • its in basement.
    – PAN
    May 31 '21 at 13:45
  • @PAN if it's blowing cold air down into the basement area, the air flow won't be compromised. If the vent register has directional guides, direct them away from the wall.
    – JACK
    May 31 '21 at 13:57
  • Thanks Jack! I am considering the hot air won't also compromised. since your specifically mentioned cold air.
    – PAN
    May 31 '21 at 14:02

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