... the top of hood air supply, before the return air; under-floor air supply, the return air; top of the air supply duct; before ... industrial materials, play an active role in environmental protection. Air Conditioning Refrigeration applicable R22, R407, R410 and other environment- ... the crew to use the process, the atmospheric environmental impact.Norms: 70KW, 80KW, 90KW, 100KW, 150KW, 180KW, 200KW ...