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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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  1.  
    I managed to pick up a brand new Lossnay unit on eBay for the grand sum of £177

    The house is a 4 bed terrace with attic conversion and three rooms downstairs.

    I propose having two extract points ie bathroom and kitchen.

    Can you confirm the following?

    1. Optimal duct sizing and hence extract hole diameter?
    2. Is directly above a shower going to encourage cold draughts on skin?
    3. Will one outlet suffice? For instance on the landing ceiling? Viking House unit has a single location for his system
    4. Any idea on how to control the system ie. Humidity sensors, co2 sensors etc? Where to order from, easy to set up?
    5. How do I rig up a pre heater and set it to heat when outside air temp. Drops below x

    Thanks
  2.  
    1 - as per manual, if poss up-size the 2 ducts to outside.
    2 - no (mine is like this and no probs at all)
    3 - No - recent threads incl discussion on this very point
    4 - As per manual - basically if it has a switch live for boost, dead easy just use whatever sensor(s) you want - no switch live means no chance and can't be controlled.
    5 - look up duct heater but they work when air extracted from house is below set temp! Also recent link here to HW fed duct heater if that is better for you, but electric normal.
  3.  
    I'm afraid it never came with a manual

    As for point 3 what I gathered from the recent other thread was that due to equalisation of gases one outlet would be fine? What did I read wrong?
    • CommentAuthorTriassic
    • CommentTimeFeb 18th 2015
     
  4.  
    You read too quickly - what you said was indeed the hypothesis but deep skepticism and concern by all but one was the theme.
  5.  
    Be careful about using this unit with an extract right above a shower. I have the same one (paid more than that though!) and they are very, very clear about 80% RH being max you should be exposing the paper heat exchange core to. When I get mine in I will be monitoring the airflows and activating the summer bypass if the RH is in the danger area till the RH drops. It depends on the size of your bathroom, locations, temps, length of showers etc as to what your RH is in the bathroom, but directly above the shower sounds like a very bad idea to me for this particular unit without taking extra preventative measures.

    You will need to balance the system either way to suit your ductwork and supply/extract valves

    I assume I am the "one" that Gotanewlife refers to! Take them for what they are, they aren't simple plug and play but if they perform to the _tested_and_published_ (SAP Q) specs then I will be happy. There are controllers available on ebay as well that another user on here pointed me to in another thread if you want a simple control option.
    • CommentAuthorJamster
    • CommentTimeFeb 18th 2015
     
    We were told that the Lossnay model our installer initially wanted wasn't suitable for use in wet / high humidity rooms, including the kitchen... Presumably this is because of the paper filter.
  6.  
    Any room that is above 80% RH for a significant length of time is in a building that has issues. It isn't the filters, its the heat exchange core that will have problems if it is overloaded with moisture. I've already outlined how I plan to manage this but I can't confirm how well it works in practice till I get it installed. Need to finish the house first though!
  7.  
    Ho Ho, confusion reigns and all my fault. Willie - I was referring to V's reply to my reply to Q3. IE was one duct alone adequate for the output as per the design philosophy of VH's FreshR, logically (assuming the FreshR works) one outlet duct (and indeed one inlet duct) would be sufficient for 100m2 with undercut doors etc. I and others were dubious and VH was the 'one' I was refering too!

    Now Triassic has done the needed search for Vic to find the manual and you have joined the fray I am sure Vic will do much better. I had assumed his 'above the shower Q' was regarding some people's view on here that moving air on wet naked bodies is a bad idea (and my experience is that even on boost it doesn't work like that in a shower cubicle). However, the Elephant in the room is the paper heat & water vapour exchanger and I wish you both the best of luck with that one in the UK environment.
  8.  
    Okay so if we assume 80% RH is the max these units operate in, and the extract is directly above the shower where let's say for arguments same is 90% RH.

    However, as I have two extracts which would tee before the unit the average of two sources is going to be less than 80% surely so no real concern? Particularly as I'd adjust the flow so maybe 25% of flow would come from the bathroom?

    To have 80% RH average in the whole house would be a major problem of the fabric of the building surely?

    I can see how one outlet would work, same as positive input pressure systems work to reduce condensation? It would surely be better than no outlet anyway... Air would be dispersed as it needs to get from the outlet to the two extract points. That in itself would encourage circulation.

    As an aside how many outlets would you suggest? One in the attic bedroom perhaps and one in the living room?

    Where would you put the controls and sensors?
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