The bactericidal section is designed for air disinfection by ultraviolet radiation directly in the duct. The section can be mounted in any position. The casing is made of galvanised steel. As lamps are used bactericidal gas-discharge mercury lamps of low pressure, power 75 W (230V power supply). 1 variant of selection: Calculation methodology (according to the Ministry of Health Manual R 3.531904-04, pr. 4) Nl - required number of lamps; Pafl - air flow rate, m3/h.; Hv - required volume bactericidal dose, J/m3. Rc - reserve coefficient, equal to 1.5; Fbk.l - bactericidal flux of the 1st lamp, equal to 26.5 W; Cf - coefficient of use of bactericidal flux, equal to 0.9; Then the section with more than the calculated total number of lamps is selected. In this case, the air flow rate through the selected section should not exceed the maximum permissible air flow rate