No Panel, No MLV
Insulation sweeps keyed on measured airflow resistivity.
Tests
7
Effect of Insulation Flow Resistivity
Rw range
7–18dB
spread 11 dB
Highest Rw
18dB
Polyester (1,800 N·s/m⁴)
Largest ΔRw vs first
−12dB
GW 45 mm R2.5 (12,000 N·s/m⁴)
Sound reduction index
R′ from the 2270, re-referenced to the 0.9216 m² specimen area (−0.35 dB). Grey lines: reference bounds.
Single-number ratings
Open in explorer| Varies | Test | Rw | C | Ctr | ΔRw vs first | ΔRw vs open | Mean R | |
|---|---|---|---|---|---|---|---|---|
| Polyester (1,800 N·s/m⁴) | Project055 | 18 | 0 | −1 | ref. | +18 | 16.7 | |
| GW 210 mm R5 (8,500 N·s/m⁴) | Project049 | 17 | −1 | −4 | ±0 | +16 | 14.3 | |
| GW 100 mm R5 (8,800 N·s/m⁴) | Project051 | 8 | 0 | −1 | −10 | +8 | 7.0 | |
| GW 175 mm R3.5 (9,500 N·s/m⁴) | Project050 | 11 | 0 | −2 | −7 | +11 | 9.2 | |
| GW 45 mm R2.5 (12,000 N·s/m⁴) | Project052 | 7 | −1 | −2 | −12 | +6 | 5.7 | |
| GW 90 mm R2.5 (15,000 N·s/m⁴) | Project048 | 12 | −1 | −2 | −6 | +12 | 10.2 | |
| GW 90 mm R2.7 (34,000 N·s/m⁴) | Project047 | 17 | 0 | −3 | +1 | +17 | 16.2 |
Rw, C and Ctr per ISO 717-1 over 100–3150 Hz. ΔRw fits the reference curve to the band-by-band difference curve, which is not the same number as subtracting two separately rounded Rw values. Mean R is the arithmetic mean over the 16 rating bands.