If your asking can you leave you openers open on the night vent while you go out then i wouldnt recommend it for downstairs windows, you'll soon have some itchy fingered yob crow barring them open (which wont be hard)
Trickle vents can be retro fitted, bit of a pain routering slots in the window especially if its steel reinforced but if your willing to pay or do it yourself then its do-able.)
Trickle vents can be retro fitted, bit of a pain routering slots in the window especially if its steel reinforced but if your willing to pay or do it yourself then its do-able.)
Willing but not at all able!
Yeah there are no vents at all... don't ask...
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