Ducting and Fan

Once a kitchen extract system exits the fire rated compartment of the kitchen and passes through other areas of the building it needs to be either of the following:

• Duct should be fire rated including insulation to the same rating as the compartment that it breaches
• The extract duct should be boxed into a fire rated service void that houses the duct and no other services.

Our fire rated duct systems can be fire rated up to four hours and up to 1 hour for kitchen duct system and can be certified to EN 1366 depending on site requirements. Thor approved.

With standard fans mounted within the extract air stream the motor and impeller can be exposed to elevated temperatures and large volumes of grease which over time can burn the motor out.

A high temperature fan has a centrifugal impeller with the motor mounted behind in a thermally insulated enclosure to protect it from the grease and high temperatures which helps prolong the motor life.

Using a high temperature centrifugal fan has the following benefits:

• Centrifugal fans are generally quieter due to the impeller design
• Centrifugal fans are capable of delivering required airflows against much larger external static pressures associated with canopy extract systems and specifically grease and odour filtration systems
• Having the motor in a separate enclosure away from the grease means it is easier for a service engineer to work on the fan as it is not coated in grease
• Using variable speed drives along with a high temperature centrifugal fan increases fan efficiencies at part load and allows for infinite speed adjustment
• We can also offer fans with EC motors as opposed to an AC motor which can offer up to 20% greater efficiencies at part load than an AC motor fan