Not truly a DIY topic, I have no intention of fitting a gas cooker myself. I love my family... Background When I moved into my house 26 years ago, I was faced with a rusty cooker hood and a hurricane-like draught from airbrick ventilation. Also, there was a lack of cupboard space in the kitchen. My solution was to rip out the cooker hood and associated duct, fit home made wall units which covered the interior side of the extract hole and box in some plumbing which also served to cover the airbrick. I installed an electric cooker and fitted home made free-standing (bomb-proofly secured to walls) cupboards topped with worktops to every available space. Not professionally done but very effective - 26 years later, the only problems are that the cupboard door hinges are due their fourth replacement and the sliders for some drawers have disintegrated and I really must get the iron-on edge trim ironed on. They stopped making it years ago but I've a good stock in the garage... But I digress. Sod it, while I'm digressing, I'll also mention that as a result of my efforts, I had plans for my handicrafts to be my "Protect and Survive" nuclear shelter - a couple of doors laid across the opposing work surfaces, a well-stocked tin cupboard, camping kit and sundry tools in the adjacent utility room, ready to hand. You get the gist. Now situation My electric cooker has gone on the blink. It's done well, about 15 years since the original one went kaput. The trouble is that it's 55cm width and there's not a great deal of choice in that width fitting. I'm considering replacing it with a gas cooker as there are more available in 55cm width. (60cm would involve restricting the airflow to the fridge and freezer and reducing the drawers from 300mm wide to about 250mm wide - a lot of work, especially as the work tops were chased into the walls - the block layers must have been more pissed than the plasterers. It's easy enough to say "I'll have that one, install it for me" but that'll only work if I have a kitchen that meets the Gas Safe ventilation requirements (and I've had running arguments with British Gas for the last 10 years with regard to my boiler - which they fitted 20 years ago, then decided that the ventilation wasn't adequate so kept putting "unsafe" notices on, despite the room having 3x the Building Regulations ventilation requirement) - finally resolved by me enlarging the ventilation opening to 5x the Building Regs requirement, then restricting it back to 3x by fitting the poxy plastic louvres that they seem to think are a cure-all). Question So my question is "What ventilation is actually required for a gas cooker?" I've looked on the net and found conflicting information - varying from only needing an openable window (mine's a 4' x 2'6" tilt and turn) to various trickle ventilation and mechanical ventilation, complicated by room size and the power of the cooker. I haven't made any definite decisions but the Zanussi ZCG-55QGW looks tasty. Adding the burners together, it looks like it can guzzle 12.5kW flat out ( http://www.electrolux-ui.com/2012/892/950527EN.pdf - page 20) though I don't have a preference for black, crispy cinders. My kitchen is about 3.5m x 3.5m x 2.5m - less cupboard infringement. I wouldn't worry too much if I have to open up the airbrick again but I'd be a bit sad if I had to install a cooker hood - that would involve cutting though the sides of a wall unit and installing flat trunking that would mess up the cupboard space, not to mention bodging electrics.