I cant comment on the price because I haven’t seen it. It also depends upon the number of inspection points/access points. Don’t forget that it is the ‘trunking’ that goes outside the building too.
Kitchen exhaust system cleaning is the removal of grease, debris and other contaminants that accumulate on the components of a Kitchen canopy exhaust system. Grease and particulate build up in the exhaust system is a fire hazard, and greatly impacts on the efficiency and lifetime of mechanical equipment.
Technicians should perform the work in accordance with HVCA TR/19 Standards. Cleaning includes the fan, hood (external and internal surfaces), filters, and associated horizontal and vertical ductwork.
The frequency of cleaning suggested under the above regulations is as follows :
Heavy use (12-16 hours per day) 3 monthly.
Moderate use (6-12 hours per day) 6 monthly
Light use (2-6 hours per day) 12 monthly