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It allows for the builders to install all the ducting to the ventilation unit etc before actually fitting the (second fix) fan unit
Model HRV1
Ceilings are subject to fire regulations and must be fire protected in accordance with Approved Document
Its IPX6 rating ensures reliable performance even in heavy rain
Ubbink Aerfoam 180mm 1m Pipe Insulated Duct product_type_maninfold It allows for the buildersAerfoam is an easy to install, insulated and airtight ductwork system used in central mechanical ventilation and heat pump systems, which minimises the risk of condensation in or on the duct (airtightness class D = ATC 2 up to + 200 Pa). 180mm Internal Diameter 212mm Exterior Diameter Insulated Extremely easy and safe to cut to length Airtight mechanical connections, which are extremely easy to install Airtightness class D ATC 2 up + 200 Pa, which