Ducting Step Down Collar 150-300MM 

This is a reducing ducting joiner, tapered to assist duct fit on more tightly.

Can also be used for the Redback Chiller. 

Actual outer dimensions of the collars are 300mm down to 150mm in 50mm steps.

Tapered 305 mm – 300 mm

255 mm – 250 mm

205 mm – 200 mm

155 mm – 150 mm