The exhaust is fitted from a side of the house. Every time when is a relatively strong wind - the gas boiler switches off just for a second or two. Typically it's not a big problem unless you are taking a shower - the the water gets colder. Sometimes when wind is really strong the period with cold water might even take 10-15s (and water gets really cold then)
Is there any device which can be fitted outside of the house to prevent wind from blowing into the exhaust?