Flat ventilation box EFR series

•EFR 10, EFR 12: 1 speed setting. •EFR 10 R, EFR 12 R: 5 speed settings; one of the 4 levels can be selected for the base load operation. Level 5 (maximum) is activated by an extra contact, e.g. light switch or hygrostat. The overrun time is set in the unit using a potentiometer (3 - 25 minutes). •Installation in DN 100 and DN 125 ventilation ducts. •Smallest dimensions for installation where space is at a premium. Ideal for redevelopments. •Centrifugal impeller with backwards curved blades. •Inlet and outlet side connection couplings for direct installation in ventilation ducts. •IP 20 degree of protection. Motor Thermal overload protection as standard feature. Robust motor with ball bearings, maintenance-free. Mounting instructions Can be fitted in any position. With mounting plate for wall and roof installations.