[Sweetc]

Hello to all HVAC connoisseurs and DIY'ers in general !

======= Current setup =======

- Ducting size is 6" which would allow for ~150CFM 
- Fully dedicated, single point [SIZE=1]"for now"[/SIZE] (simplified)

======= Liveable surface in square feet =======

(L1)
8 x 5.2ft = 41.60 ft²
11.6 x 14.2ft = 164.72 ft²
9 x 11.6ft = 104.40 ft²
19 x 11.4ft = 216.60 ft²
11.9 x 7.3ft = 86.87 ft²

(L2)
11.7 x 16.8ft = 196.56 ft²
8.2 x 10.6ft = 86.92 ft²
9.6 x 12ft = 115.20 ft²
10 x 8.10ft = 81 ft²

(B1)
24 x 32ft =768 ft²

====== TOTAL ========
w/b = 1093.87 ft²
wb = 1861.87 ft²

Question:
With my surface, I'm looking at around 50CFM without basement
( 90CFM with )

I've read that you can have "too much" ventilation.
Though wouldn't pretty much any unit function properly considering they have different speed settings..?

I was reading up on some models;

gasexperts.ca/product/lifebreath-max-series-model-205-max-hrv/
[B]Ventilation Performance: 89 cfm[/B]

gasexperts.ca/product/lifebreath-rnc-series-model-rnc5-hex-tpd-new-2/
[B]Ventilation Performance: 179 cfm[/B]

 

[user_12345a]

You can cycle the HRV.

For most, you can get a simple humidistat that shuts the hrv when humidity drops below a certain point so you don't over-ventilate and dry out the house in the winter.

You can also get a push button control so you can overide humidistat.

 

[Sweetc]

Yes I was already planning on doing that, so basically there won't be any difference on which I choose in the end ~?

And for which ever model I settle on, they both come with the 99-DXPL02 digital control unit which seems nice.

 

[user_12345a]

i wouldn't buy a tiny hrv.

100 cfm minimum. no harm in having more than you need, you just run in at a lower speed/cycle.

I wouldn't go for double, but no harm in going 50% over.

With a 90 cfm estimate, 100 to 150 cfm unit would do fine.