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The Tuttle & Bailey SC series thermally powered variable air volume diffusers offer a completely efficient, cost- effective, maintenance free means to control the flow of conditioned air without wall thermostats, duct thermostats or added system pressure. Each diffuser is completely self-contained and self-powered. For the SCVH, the mechanism is operated by four thermostatic elements to provide VAV room temperature control in heating and cooling. The SCAH provides VAV cooling with adjustable warm-up cycle control which reduces the stratification of warm air along the ceiling. The SC provides VAV cooling only and typically used within interior zones where minimal heat loss exists. A cone shaped diffusion damper creating less turbulence allows complete and even air distribution.