Cross ventilation is one of the most effective ways of ventilating a building. Cross ventilators are often used in conjunction with both passive/natural air movement and a forced air system providing heat recovery. The NAT Vent can be designed to meet BB93’s requirements of 39 dB Dn,e,w with a face area of 2m² and a free area of 50%, with a length of 1100mm.
For design ideas and further information on the cross ventilator, please see Chapter 3 of the MACH Acoustics book.