As already said , just get the first one you posted and dont fit the baffle, its just a piece of plastic that fits inside the vent its not rocket science, very common and recommended by the manufacturer to do this, full instructions come with the vent.
Reply from FiremanT, I don't need to. I am qualified. You are not.
Please take your time prove your statement's,
FiremanT your first reply to this thread was very inaccurate as you assumed its a back boiler.You seem to have got annoyed and went off subject by trolling on about the decorative perforated screen aperture sizes saying British Gas sent a contractor on £20 and the potentially safety issue had been missed.Please prove BG are sending service operative's on £20 and missing safety issues.
So please prove your statements re me and British Gas,we have the right to ask here or elsewhere.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local