DUCT FOR AIR SUPPLY AND EXHAUST

摘要

PROBLEM TO BE SOLVED: To provide a duct for air supply and exhaust for achieving a mechanical ventilation system without such defects that the amount of suction in the exhaust opening in each chamber is unbalanced and a load is applied to the fan by the amount corresponding to pressure loss generated to the flow of air in the duct in the conventional mechanical ventilation system targeted for a plurality of chambers. SOLUTION: A plurality of rows of small holes where small hoes 3 and 5 for air inflow are punched at an appropriate interval in the longitudinal direction of a duct 1 are provided at symmetrical positions.