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Ventilation supply and install

I'm after a ventilation system Quick Google search Positive pressure systems - are systems used in older homes (pre-2000) and are designed to duct fresh, dry, filtered air into the home that pushes out stale, moist air though gaps around doors and windows Basically want this through out the house 1 in each bedroom 1 in open plan living/kitchen 1 in laundry area No idea how much it would cost so just put 3999