Meet the Team

  • Jack Friend • Managing Director

    Jack has worked in the ventilation hygiene industry since 2007 and has gained experience working in a variety of different roles. Jack has assisted on projects across Europe, delivering training on Lifa Air equipment and assisting on projects.

  • Derek Wilkins • General Assistant

    Derek is the newest employee of Hasman starting in November 2016. He has taken to work for Hasman like a duck to water and is a great asset to the business.


At Hasman we use expert tutors to deliver our ventilation hygiene training courses, please see a list of these tutors below.

  • Nick Umfreville • Expert Tutor

    Nick is an encyclopaedia of knowledge when it comes to ventilation hygiene and indoor air quality across the world. With over 30 years of experience in duct cleaning his expertise is invaluable and a great asset to anyone who gets the opportunity to work with him. Armed with a dry sense of humour Nick is a brilliant tutor and advisor.

  • George Friend • Expert Tutor

    George has worked in the industry for over 15 years and is a current author of the BESA TR19 document. He is a technical committee member of the BESA and was president of the European Ventilation Hygiene Association (EVHA) whilst running a successful business in the sector.

    George has a great deal of knowledge and a good sense of humour that shines through when he delivers training and presentations. He is currently helping to write the new industry standards for Ventilation Hygiene Apprenticeships.