Paddeco will guide, help and support candidates through the process of accreditation and we are inviting duct-workers across the country to register their interest. Paddeco offer : Level 2 and Level 3 in Ductwork Installation. BSEHV11 - Ductwork Hygiene Course. After an Initial enquiry, an experienced assessor will evaluate your skills, experience and knowledge; an Individual learning plan will then be developed which will be linked to the criteria of your qualification. Your designated assessor will guide and support you right the way through to your certification.