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What is a VCD in a duct branch?

They serve as the main airflow controller for the branch. Without a VCD at the front of the duct branch, it can be very difficult to control the airflow for each supply air diffuser precisely regardless of the types of the supply air diffusers.

What is a BD Vacutainer?

• Safety engineered devices such as the BD Vacutainer®EclipseTMblood collection needle and BD Vacutainer® Push Buttonblood collection sets which allow for collection from patients of all types with the added benefit of protecting healthcare workers from the risk of needle stick injuries.

What is a VCD in a supply air diffuser?

Without a VCD at the front of the duct branch, it can be very difficult to control the airflow for each supply air diffuser precisely regardless of the types of the supply air diffusers. The appearance of VCDs is almost identical to the MFDs except motorized smoke dampers have rubber lining for better sealing and lower air leakages.

Are MVCDS fire-rated?

However, MVCDs don’t require to be fire-rated. Hence, their actuators are not fire-rated and don’t close as fast as the actuator used for MFDs. Furthermore, most MVCDs use modulating actuators instead of on/off actuators. VCDs are mostly made of galvanized iron (GI) at a thickness of around 0.7-1.0mm.

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