Tue, 19 Dec 2023 06:26:01 +0000 http://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299231#Comment_299231 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299231#Comment_299231 Wed, 14 Dec 2022 09:42:20 +0000 Swarm
I know about units like Zehnder filter box but am nervous about fitting them to an otherwise functioning MVHR unit. Cutting pipe work etc.

Has anyone else dealt with this problem? Are such units simple to fit?

I also wondered about buying some hepa filters designed for vacuums and sealing them inside the actual room outlets. If I remove the outlet there is a plastic plenum? box that could fit a filter and I could seal around it. I thought maybe that the cumulative area of these filters over all the house outlets could be similar to one large filter next to the main MVHR. With the bonus I wouldn't have to modify the main unit pipe work.

Finding a suitable size filter is challenging but I should be able to. Worth a go maybe?]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299232#Comment_299232 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299232#Comment_299232 Wed, 14 Dec 2022 09:52:04 +0000 bhommels Despite having upgraded the inlet filters from G4 + G4 to G4 + F7, this does not eliminate all smoke traces.
You could introduce HEPA filters just about everywhere, do keep in mind that this will increase the resistance significantly and with that the running cost and wear. I had to recalibrate my MVHR after the filter upgrade.
I unfortunately just have to switch the MVHR off when folks around me have a go at burning wood for visual comfort, grrrr. (Our village is connected to mains gas)]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299233#Comment_299233 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299233#Comment_299233 Wed, 14 Dec 2022 10:05:32 +0000 Swarm
I might experiment with HEPA filters at outlets as it will be quicker and cheaper if it works.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299236#Comment_299236 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299236#Comment_299236 Wed, 14 Dec 2022 12:20:26 +0000 Swarm
Typically, no-one is currently burning wood, so I can't test how effective they are!

I'm also wondering about just having a single (cheap vacuum bag) filter at the manifold, next to the MVHR, for ease of replacing and tidiness. But there will then be a smaller filter area, so increased resistance for airflow.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299237#Comment_299237 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299237#Comment_299237 Wed, 14 Dec 2022 14:35:43 +0000 Dominic Cooney http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299239#Comment_299239 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299239#Comment_299239 Wed, 14 Dec 2022 15:44:40 +0000 Swarm http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299247#Comment_299247 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299247#Comment_299247 Thu, 15 Dec 2022 09:39:46 +0000 Swarm http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299253#Comment_299253 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299253#Comment_299253 Fri, 16 Dec 2022 06:51:36 +0000 cjard
Have you done it to all outlets? I suspect that the resistance will increase so much that it'll be not much different to just turning it off..

Mine's turning itself off for anti frost purposes anyway :)]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299260#Comment_299260 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17666&Focus=299260#Comment_299260 Fri, 16 Dec 2022 17:43:49 +0000 Swarm
There's even bigger bags I could have used but it looks silly enough already. I can still feel a lot of air coming out of the outlets and the fan speed is only on about 35% at the moment. It's certainly better than having to turn off the whole unit when the smoke is bad.

It looks like there'll be some wood burning tonight, so hopefully will see some lower PM levels now.]]>