pvc arm hood Ceiling or hanging arm hoods are made of PVC and are suitable for use in laboratory environments due to their anti-corrosive properties and resistance to acid fumes. The material of the channels and centrifugal fans in this system is made of PVC. The ducting system in this type of hoods is done above the false ceiling and the hood itself is on the main ceiling is connected This type of hood is made to measure with a diameter of 10 cm and a length of 300 cm. The specifications of PVC fans are presented in the table below.