The formaldehyde emission test chamber has important requirements for the volume of the inner box for testing due to the different sizes of various samples and the varying number of tests. Please choose according to the tested sample. The air exchange rate inside the box refers to the ventilation rate of uncontaminated air introduced into the test box. Currently, the national standard specifies it as (1.0 ± 0.05) h-1. The air flow velocity inside the test chamber refers to the speed at which air flows inside the chamber. According to the standard, the air flow velocity during environmental testing should comply with (0.1~0.3) m/s, and the accuracy should be within ± 0.05 m/s.