Further information for Spelsberg BEL Air M40 (26344001)
BEL Air ventilation element set, to prevent condensation in housings, for vertical installation in housing walls and GFL combination flanges with appropriate pre-punching, at least two ventilation elements are required per housing, M40, set = 2 pieces, air exchange rate: 30 l / day / setDimensions: 150 x 220 x 10mm