Telephone box sound damping ventilation system - has easily exchanged ventilating and sound absorbing plates preventing condensation and combined with filter

The sound deading ventilation system is suitable for acoustic chambers, telephone boxes etc., and includes channels for air entry and air extraction. The cladding is of plastics, wood or other suitable material, with a box of corrosion resistant metal. It also uses sound deadening absorber plates. These incorporate air circulation slots and fine mesh grids, with easily changed absorber plates and filters. Condensation liquid is prevented from collecting, with different inside and outside temperatures, for optimum sound level reduction.