Smart, balanced, non recovery ventilation
big__o
| Posted in General Questions on
Hi I’m looking for ideas to get fresh air to the bedrooms in my house affordably.
Currently i open a window in the main bedroom and one upstairs to get air flowing and co2 levels down.
I have an exhaust fan in each of three bathrooms and I’m thinking of setting one to run continuously to provide the exhaust side of the system.
I’m looking for recommendations for a supply fan that i can filter then tie into the ac ducting for the bedrooms.
I need a fan that can do 150 cfm through a merv 14 filter.ideally i would pass the incoming air through a 20x25x4 filter before it goes to the bedrooms.
Thanks!
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Replies
I don't have to tie into the existing ac system. I could do new 4 inch ducts to each bedroom if that would work better
Smart would be having sensors and only running the fans when CO2 or VOC levels indicate ventilation is needed.
If you're not trying to do heat recovery I don't see any point in trying to be balanced, because you're not going to be.
It probably will be more effective to try and filter the air in the house instead of the air coming in.
So I'm thinking a sensor for your existing fans and a interior filter.
@dccontrarian, That's an interesting approach
I'll have to look more into it.
When you say more effective, do you mean more cost effective? Better filtration?
What kind of filtration do you have in mind?
For control i run home assistant and its very easy to control a smart plug based on co2 and/or pm2.5
By more effective I mean better filtration.
If you can control a smart switch, just replace the wall switch on the existing fans.
thanks @dccontrarian for the idea but i feel the bathroom fans are somehow bypassing the bedrooms.
I have run a bathroom fan for an hour before and the bedroom co2 hardly dropped. I think it may be pulling from my living room where i have 14 single hung windows and not pulling from the bedrooms, so something delivering air to the bedrooms may force the bathroom exhaust to pull from the bedrooms
What if you crack a window in the bedroom while you run the fan?
@charlie Sullivan
That could work but im looking for something with more control. . With a supply fan i can have it start and stop under varying conditions, and every room will get fresh air.
I found some variable speed ecm inline fans with 200-400 cfm for $50-100 that i might try