Replies

1. 
   the74impala | Feb 04, 2022 03:53pm | #1

   I thought there were restrictions on how close to grade they should be also. Is there any way you can create a chase to the attic and go out a gable wall instead?

1. 
   guillow | Feb 04, 2022 04:06pm | #2

   Our 1st floor starts about ~3ft off of grade, so I think the ports will be 2ft up above grade.
   Interesting idea on sending the vents to the roof. Would there be issues sending these things up 3 stories (~30ft+) with pressures? Also, would it be worthwhile since we'll need to put the 2x 8" ducts through a bunch of conditioned space? I guess a loss of 2sq ft in a chase all the way up to the attic isn't terrible... Is that preferable to just popping out of the foundation?

2. Expert Member
   Akos | Feb 04, 2022 04:24pm | #3

   Can you go through the rim joist of the floor above? Much easier than a stone foundation.

   For ERVs, I normally use a standard vent cap with a metal duct and start the insulation on the inside of the house. If you cut the hole slightly larger, you can spray foam around the steel duct for a bit of added insulation and to air seal.

   Intake location are more about where it is less likely to pick up outdoor pollution. I would go up only if the only side available is on a driveway side, even then go for soffits and stay away from the roof as it might pick up the smell of hot shingles in the summer.

1. 
   guillow | Feb 04, 2022 04:36pm | #4

   100 year old rubble foundation followed by what looks like double brick masonry walls. So no easy place to drill through... Would it be better to get high enough to go through the double brick?

   Re: side vs up. Does it matter is we are within 8ft of our neighbour's house? is that too close to put an intake port in?

   Do you put a slope in the Exhaust ducting if you can? If so which direction? towards the unit? or towards outside?