[Rachel Mitchell]

Thanks Mark and Tom for your replies – its much appreciated

[Rachel Mitchell]

Thank you Mark and Kate for your very helpful comments, the client has now decided to go for a full cavity fill with mineral wool which hopefully will address some of the issues you have raised
I'll have a look at Sally's article- thank you for the link

Rachel

[Rachel Mitchell]

Can anyone advise of a certified passivhaus window and door which also meets secured by design
many thanks
Rachel

[Rachel Mitchell]

I also have another MVHR question, I have a large house -600m2 and it will possibly need two domestic MVHR systems to provide the correct amount of supply/extract air
supply is 403 and extract 540, is this the correct approach or should I be looking at a commercial MVHR unit?

[Rachel Mitchell]

thanks Nick and Toby,
Nick my next question on how to deal with the MVHR so thanks for answering that one in advance!

[Rachel Mitchell]

thanks Nick and Dave for your replies is there an issue with single room MEV and air tightness?
Rachel

[Rachel Mitchell]

Does anyone have any knowledge of the FiWi MVHR system which Viking House in Ireland are offering?
http://www.viking-house.ie/fine-wire-hrv.html

[Rachel Mitchell]

thanks for the advice Mark, I did notice the dB of the unit, and was not aware there was a PH requirement for noise, so that is useful to know
I'

[Rachel Mitchell]

Thanks for your prompt reply Mark, yes it is a garden office, so one or two people at the most and only in the day time
and the challenge has been to find a unit that small enought not to produce over ventuilation
what's your view on single room units such as the vent axia HR 25 – could this do the job?

the client is looking to try for passivhaus certificaiton so at the moment MVHR is the option being considered

[Rachel Mitchell]

thank you Alan and Nick for you comments- do you think that summer bypass should be specified in houses where is there more air volume and I assume more heat loss?

On another but similar subject, I have a scheme which has a planning restriction on opening windows- so overheating is a big problem, do you have any suggestions.
We can use passive stack, but this is not getting the air changes in SAP or we could over size the MVHR and use this, which works in theory, but I'm worried it will be noisy and drafty in practice, or we could use a centralised extract system but then lose the heat

Are there any other solutions?

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