Acoustic Foam Attenuation
Transmission Loss dB|Frequency (Hz)	65	125	250	500	1000	2000	4000
3.5kg/m5 PVC/ Barrier mat	-	15	15	17	21	27	30
Duct Size 900 x 600 (12mm foam)	-	0.2	0.6	1.7	3.7	5.3	4.5
Duct Size 900 x 600 (25mm foam)	-	0.2	0.8	2.9	10.8	6.9	7.2
Duct Size 900 x 600 (50mm foam)	-	0.8	2.9	7.2	11.0	7.1	6.2
Duct Size 450 x 600 (25mm foam)	-	0.4	1.0	3.3	14.1	8.3	8.9
Duct Size 450 x 600 (50mm foam)	-	1.6	3.1	0.92	16.6	8.8	8.6
Duct Size 300 x 600 (25mm foam)	-	0.6	1.4	8.7	15.1	12.0	11.4
Duct Size 300 x 600 (50mm foam)	-	2.6	5.4	10.5	19.5	15.1	11.6