Russdl Posted November 15, 2020 Author Share Posted November 15, 2020 @PeterW something else that occurred to me looking at that inline filter box you linked to, that would introduce an obvious cold bridge inside my warm roof. I'd never really considered that with my ply/MDF version, but I guess I could have issues there if I go down the ply/MDF route? Link to comment Share on other sites More sharing options...
Russdl Posted November 15, 2020 Author Share Posted November 15, 2020 3 minutes ago, Nick Laslett said: Walking around my Village today and all the wood burning I'm only trying to filter out flies and fluff at this stage, but that could well become a separate issue for us. Link to comment Share on other sites More sharing options...
PeterW Posted November 15, 2020 Share Posted November 15, 2020 15 minutes ago, Russdl said: @PeterW something else that occurred to me looking at that inline filter box you linked to, that would introduce an obvious cold bridge inside my warm roof. I'd never really considered that with my ply/MDF version, but I guess I could have issues there if I go down the ply/MDF route? I had to insulate a metal box due to condensation - same as the ducting as it’s surprising how quick you end up with pipework with a lot of condensation on it. Link to comment Share on other sites More sharing options...
Russdl Posted November 15, 2020 Author Share Posted November 15, 2020 @PeterW I'm using the Ubbink foam stuff, so that's already insulated, I wonder if my little wooden box pre-filter will cause me condensation issues???? Link to comment Share on other sites More sharing options...
SteamyTea Posted November 16, 2020 Share Posted November 16, 2020 (edited) 9 hours ago, Russdl said: I wonder if my little wooden box pre-filter will cause me condensation issues???? It is not the material, it is the temperature and humid hitting the dew point. Dew Point Temperature = Observed Temperature -((100 - Relative Humidity) / 5) OR Dew Point Temperature = ((HUMIDITY/100)^(1/8))*(112+(0.9*TEMP))+0.1*TEMP-112 Edited November 16, 2020 by SteamyTea Link to comment Share on other sites More sharing options...
Russdl Posted November 16, 2020 Author Share Posted November 16, 2020 Ummmm, thanks for the equations @SteamyTea can’t quiet see how they can help me? (the answer is, your not going to like this... 42) In more practical and less mathematical terms, how can I use those equations to inform my decision on whether to build my wooden box pre-filter or not? Shoving a finger in the air I reckon I’ll be fine. Link to comment Share on other sites More sharing options...
Onoff Posted November 16, 2020 Share Posted November 16, 2020 MDF won't like condensation. Might has well make it from cardboard. There's plans for a homebrew MVHR floating around that uses ply and sort of tilts the construction that I guess helps with any condensation. You might be able to pinch some construction tips. https://www.builditsolar.com/Experimental/DIYHRV/DIYHRV.htm 1 Link to comment Share on other sites More sharing options...
joe90 Posted November 16, 2020 Share Posted November 16, 2020 I used ply fir my distribution/silencer box, if your worried about condensation then paint it (lots). 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted November 16, 2020 Share Posted November 16, 2020 28 minutes ago, Russdl said: In more practical and less mathematical terms, how can I use those equations to inform my decision on whether to build my wooden box pre-filter or not You can't. It comes down to the statistical probabilities of the stochastic nature of weather and house usage. Or just make of from plastic. Easy to get a sheet of PVC and some 'plumbers plastic pipe glue'. 1 Link to comment Share on other sites More sharing options...
joe90 Posted November 16, 2020 Share Posted November 16, 2020 Or use clear acrylic sheet then you can see if there is any condensation ? 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted November 16, 2020 Share Posted November 16, 2020 21 minutes ago, joe90 said: clear acrylic sheet Needs a different glue. Ow about a cheap plastic box, the kind they sell in PoundStretchers (which is misnamed as a £ is a fixed size and mass, though, due to FOREX, can have a different purchase price, even if the purchase price parity is similar) 1 Link to comment Share on other sites More sharing options...
Russdl Posted November 16, 2020 Author Share Posted November 16, 2020 Thanks all. I wasn’t at all concerned about condensation until @PeterW posted the link to the galvanised filter housing, then I thought about it, I’m sure the galvanised option would be a problem without plenty of insulation. My proposed timber filter box ( @Onoff which will now definitely be ply, not MDF) will be painted. Or @joe90 clear acrylic, good thought. I’d be able to see any condensation and crud build up! @SteamyTea I’ve got plenty of airtight tape that would join acrylic, maybe a timber/acrylic combo is the way to go... Oh, and @SteamyTea 1 hour ago, SteamyTea said: stochastic is that a real word? Link to comment Share on other sites More sharing options...
SteamyTea Posted November 16, 2020 Share Posted November 16, 2020 1 minute ago, Russdl said: 1 hour ago, SteamyTea said: stochastic is that a real word? Oh yes. https://en.wikipedia.org/wiki/Stochastic Link to comment Share on other sites More sharing options...
joe90 Posted November 16, 2020 Share Posted November 16, 2020 Looking forward to seeing how you progress with this little project, keep us informed (and loads of pics) ? Link to comment Share on other sites More sharing options...
Russdl Posted November 16, 2020 Author Share Posted November 16, 2020 (edited) 1 hour ago, joe90 said: Looking forward to seeing how you progress with this little project, keep us informed (and loads of pics) ? Only if it turns out ok, otherwise I shall let this thread wither on the vine and pretend it never happened. Edited November 16, 2020 by Russdl Stoopid spellcheckautocorrectthingy 1 Link to comment Share on other sites More sharing options...
Russdl Posted November 16, 2020 Author Share Posted November 16, 2020 41 minutes ago, SteamyTea said: 48 minutes ago, Russdl said: 1 hour ago, SteamyTea said: stochastic is that a real word? Oh yes. Thanks, every day is a school day. I’m struggling to see how I’m going to fit it into my daily conversation, but I’ll have a go ??? Link to comment Share on other sites More sharing options...
SteamyTea Posted November 16, 2020 Share Posted November 16, 2020 6 minutes ago, Russdl said: Thanks, every day is a school day. I’m struggling to see how I’m going to fit it into my daily conversation, but I’ll have a go ??? Just talk about cloud. or lottery ticket winners. Link to comment Share on other sites More sharing options...
Onoff Posted November 16, 2020 Share Posted November 16, 2020 12 minutes ago, Russdl said: Thanks, every day is a school day. I’m struggling to see how I’m going to fit it into my daily conversation, but I’ll have a go ??? I know, it's a bit random isn't it! Link to comment Share on other sites More sharing options...
SteamyTea Posted November 16, 2020 Share Posted November 16, 2020 Just now, Onoff said: I know, it's a bit random isn't it! Or chaotic Link to comment Share on other sites More sharing options...
Russdl Posted December 3, 2020 Author Share Posted December 3, 2020 The over engineered MVHR pre filter arises from the gash bits of MDF offcuts that litter the house. Some finishing off to be done and it’s kept my son off the streets making stuff for his deluded dad. 1 Link to comment Share on other sites More sharing options...
Russell griffiths Posted December 4, 2020 Share Posted December 4, 2020 Please tell me you will tape and paint that wall before you fit it. Link to comment Share on other sites More sharing options...
Nickfromwales Posted December 4, 2020 Share Posted December 4, 2020 11 minutes ago, Russell griffiths said: Please tell me you will tape and paint that wall before you fit it. I’d be more worried about painting the inside of that splenderific item with a few coats of oil based paint. Link to comment Share on other sites More sharing options...
Bonner Posted December 4, 2020 Share Posted December 4, 2020 That’s a fine piece of woodwork and if it doesn’t do as a filter, you can always use it as a commode ? 1 Link to comment Share on other sites More sharing options...
Russdl Posted December 4, 2020 Author Share Posted December 4, 2020 @Russell griffiths I will (well, somebody will) @Nickfromwales I will. @Bonner I may. 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted December 4, 2020 Share Posted December 4, 2020 2 hours ago, Bonner said: you can always use it as a commode ? Might block the filter material up a bit too quickly?!? 1 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now