Locations such as factory workshops, schools, lift switch gear winding rooms, hotels, banks, boardrooms, interview rooms and doctors' surgeries can benefit considerably from noise control. Doorsets tend to be a particularly vulnerable point. There are broadly three approaches towards solving the problem of sound transmission. Most effective and most expensive are purpose-built acoustic door assemblies which incorporate purpose-designed seals. A mid-range option is to use solid core doors (such as fire doors) and top grade seals. For details of how the BBC seals its studio doors, follow the link to the Sealmaster site below. A third and less expensive method is to use one of the sets of components recommended in the table. For further details on our acoustic products, please contact the Ventura Technical Department.

Location	Stop / Jamb	Door bottom	Threshold	Accessibility	Sound Transmission Class (see below)
External	VS88 (double)	V434ARL	V2005AS		44
External	VS88	V434ARL	V2001AS		41
External	VS88	V434ARL	V179AS		41
External	VS88	V434ARL	V177AS		41
External	VS88	V411ARL	V2005AS		39
External	V350CSR	V434ARL	V2005AS		41
External	V312CR	V411ARL	V2005AS		40
External	VS88	V234AV	V2005AS		37
External	V312CR	V234AV	V2005AS		37
Internal	VS88	V411ARL	V236A		38
Internal	VS88	V434ARL	V2364A		36
Internal	V350CSR	V434ARL	V2364A		40
Internal	V312CR	V411ARL	V236A		39

STC Rating	Level of speech heard
STC-30	Loud speech understood
STC-35	Loud speech heard but not understood
STC-40	Loud speech audible as a murmur
STC-45	Loud speech barely audible
STC-50	Loud speech not audible

For details about each seal, see the relevant pages (left) or ask our Technical Department for guidance.