Naber back flow valve Thermobox, heat recovery system, diameter 125 mm (4022049)

• Backflow valve Thermobox.

Thermobox 125, black/silver. Heat retention system Thermobox for retrofitting existing Naber® wall boxes and for vertical installation (exhaust air duct over the roof).. The heat recovery system Thermobox consists of three flap pairs with magnetic closure arranged behind each other in defined distance. With a U-value of 2.2W/(m²K), Thermobox is significantly different from conventional wall boxes (approximately 25W/(m²K)) and achieves an insulation effect similar to insulation-glazed windows two completely insulated air chambers. A reflection layer on the inward first pair of valves reduces the transmission level at the entrance of the system and prevents additional heat losses. On the other hand, conventional wall enclosures have simple back-flow dampers, which are not suitable for installation in the wall façade of energy-efficient or energy-proofed house types due to their non-existent thermal insulation properties.