Which window restrictors for sash windows?

ThisIsWeird

Yay!

I'd completely misunderstood how these other ones worked - I'd assumed that the 'bolt' had to pass right through the front sash and engage in a corresponding hole in the rear one, so that the sash was locked in one position only - not what you wanted. And then I thought I was a bleedin' genius as it occurred to me it could be fitted the opposite way - fit it in the top sash, and have it pop OUT to restrict the travel of the bottom sash to 100mm max!

You couldn't see, but I was doing a wee dance at being so clever.

And then I read the instructions, and find that is exactly how it's meant to be used...

Surely perfect? Just needs a single hole drilled in the top sash, 100mm up, one each side to conform. With the bolt 'out', it allows any amount of movement of the lower sash upwards (or top sash down), for that 100mm.

https://www.mightonproducts.com/wp-content/uploads/2021/01/push_ventlockr.pdf

Lysimache

ThisIsWeird said:

Lysimache said:

Sorry, I'm not sure which ones you're referring to here - the angel ventlock selection? I didn't realise the sash needed to be removed, I thought they could just be screwed into the side etc. 

And yes the requirement is for no opening past a certain point. 

Yes, the Angel. It seems it needs rebating into the timber.

Face-Fix Angel Ventlock

The Face Fix version is fitted into the stiles of the top sash one on each side. The units are single action, so fitting two ensures compliance with ASTM F2090 17. The unit is primarily factory-fitted as access to the sash is required. However, provided the sashes can be removed easily, the Face Fix version is also suitable for use where the sashes have already been installed.

Ahh, I didn't notice that - thanks for pointing it out!

Eldi_Dos

A 50mm slat of wood of suitable thickness and width painted to match window, drilled and held in place with a brass screw and cup washer will do the job and not be to noticeable.
Take you longer to source the materials than do the job and cost pennies.

ThisIsWeird

Eldi_Dos said:

A 50mm slat of wood of suitable thickness and width painted to match window, drilled and held in place with a brass screw and cup washer will do the job and not be to noticeable.
Take you longer to source the materials than do the job and cost pennies.

It needs to conform

ThisIsWeird

You HAVE the solution ^^^^

Simple to install and use, and hardly an eyesore.

Lysimache

ThisIsWeird said:

Yay!

I'd completely misunderstood how these other ones worked - I'd assumed that the 'bolt' had to pass right through the front sash and engage in a corresponding hole in the rear one, so that the sash was locked in one position only - not what you wanted. And then I thought I was a bleedin' genius as it occurred to me it could be fitted the opposite way - fit it in the top sash, and have it pop OUT to restrict the travel of the bottom sash to 100mm max!

You couldn't see, but I was doing a wee dance at being so clever.

And then I read the instructions, and find that is exactly how it's meant to be used...

Surely perfect? Just needs a single hole drilled in the top sash, 100mm up, one each side to conform. With the bolt 'out', it allows any amount of movement of the lower sash upwards (or top sash down), for that 100mm.

https://www.mightonproducts.com/wp-content/uploads/2021/01/push_ventlockr.pdf

Just saw this - I think this is what I had in mind initially but will double check against the products!