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I'd look into an Envirovent type solution for creating airflow round the house as the trickle vents can be closed, therefore no benefit.
they can be permanently open either by design or removing the hinged cover.
Until the tenant sticks tape over them!
anything can be tampered with.
Well I've had mine installed for 3 years and so far it hasn't been abused. Trickle vents don't actually help much with ventilation I've found, as they don't actually create airflow around the house. I had TV's installed in the house before having an Envirovent fitted, they made no difference and it was only the Envirovent that helped cure the problem (namely lack of ventilation etc.).
I didnt say it would be abused...I said it could be, whether it is a trickle vent or anything else.
the op was about compliance / trickle vents, not how best to avoid condensation.
envirovent wont move air by windows if curtains permanently shut and this is where mould most likely to occur.
Trickle vents aren't a part of compliance though? Not in any HMO requirements I've seen?
Have you actually used an Envirovent type Positive Input Ventilation system before as they bring down humidity in the whole house, not just on windows?
For the OP, this thread may help as it pretty much goes through all the options available: https://thepropertyhub.net/forum/topic/3...n-systems/
the relevant legislation is building regs. and part of the hmo compliance vetting could involve checking building reg compliance/ contraventions.
im familiar with whole house positive pressure vent systems...btw 'envirovent' are just one of several companies, but they have invested the most in targeting marketing at landlords. ive seen their presentations and I think they are misleading. anyone would think they have a unique product.
personally I prefer humidistat fans in bathrooms and kitchens as they are more effective at rapid extraction of humidity at source.
Advisable to have trickle vents fitted, tenants more likely to leave these open than windows, usually opened and forgotten unlike windows which are regularly closed. Essential for ground floor due to reluctance to leave windows open because of security concerns.
Thanks for all replies and views on this. Very helpful.Here's my thinking based on the responses and other research:- Thanks @DutchNick: where the rooms have redundant chimney breasts I'll install vents once we identify the updraft. I think that's a great suggestion. If we can't find the updraft, then I'll install trickle vents in the windows.- All other proponents of trickle vents, thanks a lot, I'll get them where there's no chimney breast anyway. It is a relatively cheap addition, but suppliers think it's a shame to do add them when they've got a good energy rating.- re Envirovent: thanks for the suggestion @Adam_ but I think that's overkill for the project I need. (There's no sign of condensation, I'm just ensuring we meet standards now and and avoid any problems in the future. If I end up having a problem I'll look at such a system then).