A STC rating 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 20 Rated
STC 17 Rated
STC 15 Rated
Lining Specs
Weight lbs/sf 0.400 0.275 0.225
Fire Rated No Yes Yes
Color Black White White
Vinyl Type MLV Laminated Laminated
STC 20 STC 17 STC 15
Curtain types
Soft Fold 3 ply X X X
Soft Fold 2 ply X X
Pleated X X
Ripplefold X X
Roman Shade X X
Roller Shade X X
STC 20 STC 17 STC 15
Recommended fabrics
Nova Suede X X X
Visa Velvet X X X
Solitaire X 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)

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

The NRC range is a function of curtain construction. The highest NRC's are Ripplefold 220% construction. The lowest NRC's are Ripplefold 160% construction. Pleated curtains fall in the mid-range depending on fullness. Double sided soft-fold curtains perform similarly to Ripplefolds.

Detailed Specifics of WEAL Lab Test Results