Vision windows having-sound resisting properties complementary to the wall structures will be installed where required. All sound resisting windows will be double glazed with three-ply laminated glass and angled to minimise internal visual and sound reflections.
Sound-resisting doors will be supplied and installed to the studios and have a natural wood finish. All sound-resisting doors will be fitted with vision panels and will be supplied complete with frame and overhead door closer, magnetic seals and stainless steel pull handle and push plate. They will have a sound reduction rating of 45dB (SR).
Air-conditioning and ventilation:
All studios will be provided with cooling only air conditioning services. Due to the insulating properties of the studios and the amount of equipment operational in each one, heating will not be required. As the windows will not be opened and to maintain acceptable levels of oxygen and to contain decoration and equipment soiling the air-conditioning system will also provide approximately 20 Litres of fresh air to mix with the re-circulating air in each studio.
Humidity is very important in studios where speech is concerned, presenters will be on duty for several hours and, during holiday times and unexpected illness, often work extended shifts. To avoid dry throat speech defects, humidity levels will not be allowed to fall below 55%RH. Additionally humidity is important in technical areas where static electricity could, inadvertently, be discharged to a sensitive piece of equipment resulting in premature failure.
Condensing units are to be located outdoors on the roof or external wall. All refrigerant pipework and associated electrical services are to be run overhead within ceiling voids.
Studio technical services:
Cable ducts will be formed within the studio wall constructions to provide access between the studios and other areas for studio equipment wiring. Cable trays are to be installed within the ceiling voids to conduit cables from and between the studios and Racks Room/CTA. In the studios within the wall construction, cable raceways are to be formed at skirting and dado levels with vertical accesses for equipment wiring. Skirting and dado covers are to be natural-finished timber secured in place with countersunk screws in recessed cups to provide a flush finish. Trims to corners at wall and ceiling junctions are to be in natural matching wood pinned in place.