Hi i live in a council house and a guy that serviced my boiler said the outlet which is in the garden is to close to an air vent ,the air vent is about 30 cm below the out let and this vent goes into my kitchen behind the boiler ,is this safe i was told by another guy that came out from the council that its not a problem as heat rises ,also i would like to point out that this is right next to my back door any help would be appreciated thanx