Numatic NQS350B All Steel Vacuum Cleaner - CommercialThe NQS350B is a medium sized dry vacuum cleaner built to stand the test of time. All steel construction means the NQS350B can take the rough and tumble use by builders, contract cleaners and industrial cleaners can often include. The B in the name indicates the addition of a blower on the back of the vacuum cleaner head. The motor within the head of this vacuum cleaner can be ran at two speeds (high and low) as indicated by the 22 in the name,