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Mvhr self build
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05-07-2019 7:35am#1
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Hello,
You are not in the wrong section but just using wrong title... is MHRV not MVHR ...
I did a project few years ago. More H E R E
Nice ,challenging and best investment in the house (after water softner,accordign to my wife).
What budget you have in mind, where you based ?
Few learned points:
Oversize the unit, if you need a 250 get a 350
Get best unit out there,mine was the best 3 years ago,not sure these days.
Use round plastic pipes,75mm or 90mm
Use two manifolds for sound and distribution
Use static fixed outlets ,dont go for variable.
Read my posts and ask any questions,please.
Ive upgraded the unit since then with sensors that shows me in realtime the status of the system,as below:
Have fun...0 -
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I found that the square format is better for retrifitting due to small space available and the round one for empty shell installs where you can do it proper design.
I dont have exposure to square, i found them too industrial type to me.
The round one are antistatic and antibacteria treated from factory.I remember the smell when opened the roll.
Re noise,my unit have very fine tweking of the speeds and comprehensive timers.
Speeds, for both engines,individual per DC motor and for each sense / flow,ie highe rspeed to extract air from inside and slower to bring it from outisde (more warm air winter) or reverse for summer,to cooler faster.
Timer,gives you 3 (three) levels set up at small digit,per minute and for every day of the week and up to 8 different time slots.
Level 1 - no sound at all;
Level 2 - sound-ish but acceptable,less than airplanes,motorway and the fcuking dogs barking 25 hours here from iresponsible neighbours;
Level 3 - well,thats a sound that you can hear it across the house AND feel the air flow hit you in the face.
I have two manifolds,one for each sense that kills the sound travelling across rooms and it has noise attenuation.
Oversizing my unit from a 250 to 350 made it running efficient most of the time at level 2.
Good luck...
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Sorry if I missed it but I couldn see what diameter piping you ended up going with? Been doing as much reading up on it as possible as nervous about noise. Going to try to position everything to keep runs as straight as possible, noise reducers where needed etc but due to the length of the house I still will have approximately 8m of pipe either side of a central manifold.
There is no noise !!!
And believe me...i am very sensitive to it...
My unit on my setup:
- at level 1 i cannot hear it;
-at level 2 is there, i can hear it confirming is working but i really have to focus so that i can select individual frequencies and noise chanel bandwidth to confirm it. Most of the time, i hear it, i am happy is running and move on with my things. Night time,very very soft lullaby !
-at level 3 i select to completely refresh the air inside the house,sometime in the morning or evey evening, just before going to bed after cooking, running and sweating/farting all of us around the rooms.
Overlal,is an extra background noise but is acceptable up to level 2 inclusive.
No one complain(s) in the house apout the noise. Not a chance...
Only one i have is from a child that lives in a small bedroom and the flow oulet is above her bed,air "dropping" on her head.i had to adjust the flow vents direction.Now,she grew bigger and i can tell to shout her mouth !
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