Grazing the trickle vent calculation for facades

The table below matches the free-field sound reduction requirements of the building facade to the minimum sound reduction index of the windows and trickle vents. Results are provided in the format:

Window Rw / Trickle Vent Dnew

Reduction Rw	Window of 2 m^2 (Win/Vent)	Window of 4 m^2 (Win/Vent)	Window of 6 m^2 (Win/Vent)	Window of 8 m^2 (Win/Vent)	Window of 10 m^2 (Win/Vent)
16	14/20	15/21	16/22	17/23	17/23
17	15/21	16/22	17/23	18/24	18/24
18	16/22	17/23	18/24	19/25	19/25
19	17/23	18/24	19/25	20/26	20/26
20	18/24	19/25	20/26	21/27	21/27
21	19/25	20/26	21/27	22/28	22/28
22	20/26	21/27	22/28	23/29	23/29
23	21/27	22/28	23/29	24/30	24/30
24	22/28	23/29	24/30	25/31	25/31
25	23/29	24/30	25/31	26/32	26/32
26	24/30	25/31	26/32	27/33	27/33
27	25/31	26/32	27/33	28/34	28/34
28	26/32	27/33	28/34	29/35	29/35
29	27/33	28/34	29/35	30/36	30/36
30	28/34	29/35	30/36	31/37	31/37
31	29/35	30/36	31/37	32/38	32/38
32	30/36	31/37	32/38	33/39	33/39
33	31/37	32/38	33/39	34/40	34/40
34	32/38	33/39	34/40	35/41	35/41
35	33/39	34/40	35/41	36/42	36/42
36	34/40	35/41	36/42	37/43	37/43
37	35/41	36/42	37/43	38/44	38/44
38	36/42	37/43	38/44	39/45	39/45
39	37/43	38/44	39/45	40/46	40/46
40	38/44	39/45	40/46	41/47	41/47
41	39/45	40/46	41/47	42/48	42/48
42	40/46	41/47	42/48	43/49	43/49
43	41/47	42/48	43/49	44/50	44/50
44	42/48	43/49	44/50	45/51	45/51
45	43/49	44/50	45/51	46/52	46/52

Glazing types and performance Trickle vent types and performance