Glenn Posted January 15, 2023 Share Posted January 15, 2023 Install wisdom needed please as I certainly lack it... I have seen recommendations to have a fall on eg the pipe from the MVHR unit exhausting the air to the outside, but do I need to consider a 'fall' for the pipe delivering air from kitchen and bathrooms (ie warm and moist) into the unit? In case of condensation in the pipe? Or am I overthinking this and the moisture will stay as vapour until it hits the actual heat exchanger. Reason for asking is that I have only a small tight space in which to install the unit, along with HWC, UFH reservoir etc. Proving to be a 3D challenge... Regards Glenn Link to comment Share on other sites More sharing options...
Nickfromwales Posted January 16, 2023 Share Posted January 16, 2023 13 hours ago, Glenn said: Install wisdom needed please as I certainly lack it... I have seen recommendations to have a fall on eg the pipe from the MVHR unit exhausting the air to the outside, but do I need to consider a 'fall' for the pipe delivering air from kitchen and bathrooms (ie warm and moist) into the unit? In case of condensation in the pipe? Or am I overthinking this and the moisture will stay as vapour until it hits the actual heat exchanger. Reason for asking is that I have only a small tight space in which to install the unit, along with HWC, UFH reservoir etc. Proving to be a 3D challenge... Regards Glenn No need to consider anything for the distribution ductwork, as that will just get damp ( moisture ) and then dry out again as the air keeps flowing after the shower etc has been turned off. If the MVHR unit supply air vents are on a gable with driving rain then it may be a good idea to have the first connected pipe rising slightly, but I've not ever really given this detail any further thoughts on previous installs, and I am still in regular contact with the clients. I'd say don't worry, but make sure all joints are made robustly / duct supported well etc, and use rigid insulated ducting to atmosphere. I'd also avoid the fleece type attenuators and use metal 'box' attenuators where possible ( if you are going to install something for sound / noise reduction ). 1 Link to comment Share on other sites More sharing options...
Glenn Posted January 16, 2023 Author Share Posted January 16, 2023 Thank you Nick! That is reassuring - thought I was overthinking it. I spent more of my time coming up with the best pipe layout around the house, most efficient manifold position etc - I should have prioritised a little better on how to best fit in these dirty great 125mm ducts to and from the actual MVHR unit... Regards Glenn 1 Link to comment Share on other sites More sharing options...
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