Replies

1. 
   davidmeiland | Jan 25, 2015 01:34am | #1

   I'd go through the wall.

2. 
   charlie_sullivan | Jan 25, 2015 07:15am | #2

   Roof penetrations are hard to seal well. So all else being equal, the wall is the way to go.

   If it's custom, why does the wall direction require a 90 degree bend?

3. 
   cibula11 | Jan 25, 2015 08:30am | #3

   By custom I mean we are making the hood surround. The power pack/insert has the 6" port and damper on the top of the unit.

4. 
   cibula11 | Jan 25, 2015 01:45pm | #4

   Could I use a 6" round up the wall and then convert it to a 3.5 x 10" duct as it travels through the wall? Or would flow be reduced? This way I wouldn't need an expensive hole saw to cut my interior/exterior holes??

5. Expert Member
   MALCOLM TAYLOR | Jan 25, 2015 02:50pm | #5

   Matt, Yes you could, and there are good exterior flappers for that size. However i wouldn't make the decision based on buying a hole saw. I cut any vent opening over 4" with a jig saw.

6. 
   cibula11 | Jan 25, 2015 02:53pm | #6

   Thanks. Want just about the hole saw. I also couldn't make the exterior look right since it's already sided. I wanted to install a pvc block and mount the vent cap to it, but the 6" round vents are so large 9x9 compared to the 3.25x10

7. Expert Member
   MALCOLM TAYLOR | Jan 25, 2015 05:06pm | #7

   No problem with what you propose. I prefer the look of the rectangular ones too.

8. 
   davidmeiland | Jan 25, 2015 07:01pm | #8

   IMO the best wall cap is the 6" round Seiho. If you're hoping to get much air sealing from the wall cap, go that route. The 3-1/4 x 10 models are not as good. I think at this point I've tried 'em all, including buying some to check out that I decided weren't even worth using. http://www.seiho.com/product/index6.html