Dimensions and duct outlets Figure 1. Dimensions Vallox 51 MV Figure 2. Dimensions Vallox 51K MV Figure 3. Duct outlets, R model Inner diameter of the female collar ∅ 125 mm. 1 Outdoor air to the unit 2 Exhaust air flowing outdoors from the unit 3 Supply air from the unit to the apartment 4 Extract air from the apartment to the unit Figure 4. Duct outlets, L model (left-handed) Locations of support for HR cell Figure 5. Vallox 51 MV (R model and L model) Figure 6. Vallox 51K MV (R model and L model) 1 Supply air 2 Extract air 3 Coarse filter 4 Fine filter 5 Upper support of the cell 6 Lower support of the cell