66
≤
˃
≤
˃
Round dampers
R1
Cement
lime
√
≥100
√
≥150
√
≥100
-
-
-
-
R2
Cement
lime
√
≥150
√
≥150
√
≥100
-
-
-
-
R3
Cement
lime
√
≥100
√
≥150
√
≥100
-
-
-
-
R4
Cement
lime
√
≥150
√
≥150
√
≥100
-
-
-
-
R5
Cement
lime
-
-
-
-
-
-
Solid ceiling
construction *)
≥150
√
≥100
R6
Cement
lime
-
-
-
-
-
-
√
≥100/
≥150
-
-
R7
Cement
lime
-
-
-
-
√ **)
≥100
-
-
-
-