Having a hole in the middle of your duct brush allows the dust and debris to be vacuumed away as it is removed from the surface, leaving the duct clean. Attach your 1.5" hose cuff (not included) to the end of the brush and it becomes an extension of your vacuum cleaner. The brush is long enough and soft enough to self center in the duct yet sweep it clean. Another innovation from Braun Brush, designed with input from professional duct cleaners.
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