Lab Tests
Sound Blocking
A STC rating short for Sound Transmission Coefficient describes the average number of decibels blocked by a material.
Our STC Sound Blocking curtains work due their inner linings. These linings are specialized, proprietary vinyl’s made exclusively for Quiet Curtains. The face fabrics used to construct the curtains have little impact on sound blocking. See the Table below for recommended face fabrics.
| STC 17 Rated Lining |
STC 13 Rated Lining |
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| Lining Specs | |||
| Weight lbs/sf | 0.275 | 0.225 | |
| Fire Rated | Yes | Yes | |
| Color | White | White | |
| Vinyl Type | Laminated | Laminated | |
| STC 17 | STC 13 | ||
| Curtain types | |||
| Soft Fold 3 ply | X | X | |
| Soft Fold 2 ply | X | X | |
| Pleated | X | ||
| Ripplefold | X | X | |
| Roman Shade | X | X | |
| Roller Shade | X | X | |
| STC 17 | STC 13 | ||
| Recommended fabrics | |||
| Nova Suede | X | X | |
| Visa Velvet | X | X | |
| Solitaire | X | X | |
| Anti-Microbials | X | X | |
Under normal conditions, the following will serve adequately well as a general guide on the impact of variances in sound pressure levels:
1 dB change is imperceptible
3 dB change is just perceptible
5 dB change is clearly perceptible
10 dB change is substantial (halves or doubles noise heard)
Sound Absorption
NRC is short for Noise Reduction Coefficient. It is a measurement of how well something absorbs sound, mostly in the range of normal speech frequencies. NRC of 1.00 absorbs all sound.
Summarized WEAL Lab Test Results
| Sound Absorption Results NRC’s | ||
| Acoustic Quiet Curtains | Low | High |
| Crescent Velour | .85 NRC | 1.0 NRC |
| Vara Velvet | .75 NRC | .90 NRC |
| Overture | .65 NRC | .80 NRC |
| Visa Velvet | .55 NRC | .70 NRC |
| Nova Suede | .50 NRC | .65 NRC |
| Solitaire | .40 NRC | .65 NRC |