Trickle vents v mechanical ventilation

heat-pump-newbie · 2022-04-19T14:44:00Z

Having the ASHP I've become very aware how much heat is lost by having our windows open a little for ventilation. We don't have trickle vents, just a lockable vent setting on the window catches. I want to get new double glazing, but the law states they need trickle vents. Catch 22 ! Get high spec double glazed window with frames incorporating a non-thermal bridging construction, then make holes in them for air. Our house never going to be airtight enough for MVHR, so what sort of ventilation would be enough to satisfy the legal requirement to avoid having the trickle vents ?

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heat-pump-newbie

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Topic starter 21/04/2022 10:14 am

Thanks Jeff. The supplier I'm using is very hot on the regs, which is reassuring really. He's pointed out all the gaps and poorly finished areas of the old windows. They weren't particularly cheap 20 years ago but all the gaps were just covered by upvc trim outside and inside so leaking heat. This bloke strikes me as a perfectionist, and no doubt priced accordingly.

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Jeff

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21/04/2022 10:51 am

Posted by: @heat-pump-newbie

Thanks Jeff. The supplier I'm using is very hot on the regs, which is reassuring really. He's pointed out all the gaps and poorly finished areas of the old windows. They weren't particularly cheap 20 years ago but all the gaps were just covered by upvc trim outside and inside so leaking heat. This bloke strikes me as a perfectionist, and no doubt priced accordingly.

Then you may find he wants you to get building control to sign of any new ventilation prior to him installing new windows without vents if you go down that route.

Sounds like the last thing he would want is to fall foul of an audit inspection.

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olly

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07/11/2022 11:28 pm

@heat-pump-newbie what did you decide to do with your ventilation in the end? I am having to make a similar choice soon, so any further information would help

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heat-pump-newbie

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Topic starter 08/11/2022 12:12 pm

@olly A combination of waiting to sell a property to fund the windows and general procrastination means I haven't actually had any work done yet. However I think a full MVHR system would be too awkward and expensive for us, so I hope to get someone to fit one of these in the bathroom (or similar as I haven't looked at this recently)

https://www.blauberg.co.uk/en/blauberg-uk-mvhr-heat-recovery-ventilation-range/decentralised-single-room-heat-recovery-ventilation-units/blauberg-aeris-midi-decentralised-single-room-ductless-heat-recovery-unit-ventilator-wall-mounted-silent-heat-recycling-ventilation-filtered-fresh-a

and go for the trickle vents as per the regs. If I can use my existing old warm air ducts one day for fresh air input then so much the better.

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