Just wondering are there any experts who might be able to shed some light on this topic…..I will be building an airtight house (airtight to passive house spec <0.6 ach/hour at test pressure) but the Mrs loves cooking using a gas hob. I’ve done some reading on the internet and the main concern with using gas in any house is the accumulation of combustion gases (nitrogen dioxide and carbon monoxide). Studies done to date indicate that in many ‘houses’, levels of these gases exceed WHO safety levels. I suspect these studies were carried out on ‘traditional build’ homes and not airtight ones. My question is if I were to use a gas hob in an airtight house with MHRV would this be dangerous? It seems as soon as ‘airtight’ is mentioned people freak out at the thought of using gas when it seems before nobody ever paid much heed to combustion gases when building a traditional house. Would the MHRV make the house safer than a ‘traditional build house’ because with MHVR the air exchange is continual and not irregular or variable as with traditional build houses??

Give me air! I find it difficult to stop dozing off in closed rooms and have long thought it was due to oxygen starvation. My wife and I never sleep without a bedroom window open, even in the depths of winter, or we both wake up with headaches and find it difficult to get up and get going. How many people will suffer dozy lifestyles because the gov wants them to save energy? How many people will suffer carbon monoxide poisoning becasue there's no fresh air? Has this been looked into?
This interesting comemnt is from the Carbon Monoxide Kills website (www.carbonmonoxidekills.org.uk):
'Many newer houses are so airtight that powered exhaust fans in the kitchen and bathroom can overcome the draft in the furnace chimney and literally pull the toxic gases into the living space.'

...hmm.