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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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    What's necessary/advised? What have people who have had them installed for a good length of time done with theirs?

    I clean/replace the filters on mine every 6 months or less. Last summer (after nearly 3 years) I removed and washed the heat exchanger. I've dusted in extract vents on the ceiling where they've gathered a bit of dust and cobweb.

    Has anyone done anything more than this? There's an access panel on our manifolds (ours is all the in 75mm flexi pipe) and I remember reading something about the idea of attaching a vacuum cleaner to the pipes to clean them but I'm not sure there would be any real benefit -- you're only going to get dust in the extract and if it's just sitting there it's not doing any harm. If it moves it gets caught by the filter at the MVHR.

    The bit of the system that it strikes me is going to get dirtiest is the inlet pipe from outside (we live in London so the inlet filter is black pretty quickly) and ours is longer than recommended but also very difficult to get to so don't see how that could be cleaned (or even checked)
    • CommentTimeFeb 28th 2019
    Posted By: Simon StillWhat's necessary/advised?

    Whatever's specified in the user manual?

    FWIW, I clean our filters every three months when the light comes on to remind me. The intake is normally dirtiest, with dust and crane flies etc. The extract is normally pretty clean. I've put new ones in once in 3¹/² years and bought a whole load of filter material so I can make replacements.

    I inspect the ducting inside the extract terminals every six months or so. I found a load of dust stuck to the bend inside the one in the kitchen so I changed the terminal to one incorporating a filter after the first year or so. I found a bit of fluff inside the one in our ensuite after a couple of years so I vacuum that every now and again. Other than that, I haven't seen any dust anywhere I can see in the ducts.

    The manual says to clean the heat exchanger every five years so I'll be doing that in a year and a half. We also plan to do our initial touch up of the plaster and paint then. I expect the external ducts are fairly dirty so I might put a ladder up and have a look at the same time. But I don't much care as long as they're open enough to let air flow through.
    • CommentAuthorSprocket
    • CommentTimeFeb 28th 2019
    We just swap (for a spare set) and then clean our filters once a year.
    Maybe that's a bit lazy.

    This time of yer we get a lot of cluster flies in there. I just vacuum them out first.
    • CommentAuthortony
    • CommentTimeFeb 28th 2019
    I get service on mine every 7 years
    >>I get service on mine every 7 years

    great. but what do they actually do? What is there that you couldn't do yourself?

    We have a water softener and the company called to try to sell us a service recently but couldn't really explain what they did. The standard 'warranty' requirement for a gas boiler is an annual service but the guy who fitted ours said you're better off leaving it until something goes wrong (and topping up the pressure yourself if needed)
    • CommentAuthortychwarel
    • CommentTimeFeb 28th 2019
    On mine I clean the filter in the ceiling and the filters in the unit once a year, I also clean the intake fly screen which is mounted in the eaves by leaning out of the bathroom window and reaching up with a yard broom.
    and have cleaned the heat exchanger once in 8 years (I don't know why i bothered it was spotless)
    • CommentAuthorjms452
    • CommentTimeMar 2nd 2019
    Our manual says change filters every 5 years - no other requirements!

    In addition to filter changes (once over 8 years) I've:
    Vacuumed the filters every year
    cleaned the internal vents when I notice them looking dirty.

    After the heat exchanger there is some mould on the inside of the pipes where cold wet air leaves the house but we don't breath this so I've never overly worried about it.
    All the incoming air vents (carrying the air we breath) and the outgoing vents where the air's still warm look pretty spotless.
    • CommentAuthortony
    • CommentTimeMar 3rd 2019
    I am suppose to change filters every four months but I only change them twice a year
    • CommentTimeMar 3rd 2019
    I'd be interested to know what's involved for everybody?

    I turn off the unit, open the door on the front and slide out the filters. Then I take them and wash them, allow them to dry, push them back in, close the door and restart the unit.

    Actually usually I push in a spare set and restart the unit straight away, so I can take as long as I like to wash and dry them. Sometimes I vacuum the slot the filter lives in, if there were lots of crane flies on the filter.

    Our filters are sometimes quite dirty after three months, although not usually. But I can't imagine waiting for five years!
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