Sometimes buildings are in need of ventilation due to several reasons. They can be the ones which are always warm but now with the time, the cold air sometimes sweeps in breaking the purpose of the insulated walls in old times. In this case, home ventilation system is installed. There are numerous buildings that were built in old times but are still standing. They may be holding up quite well but they definitely cannot withstand a large mechanical system installed into it. They are fragile for that and one wrong placement can ruin the whole structure. But there are some...