This housing accommodates two bearing seats on a single shaft, with a bore diameter (d) of 85 mm and outside seat diameter (da) of 95 mm. The housing, cap and grease-guiding disc are made of grey cast iron GG 20. Mounting dimensions can be read from the catalogue drawing: A = 648 mm, D = 200 mm, H = 125 mm, J = 320 mm, L = 400 mm, N = 24 mm, b = 90 mm, w = 94.0 mm, A1 = 540.0 mm, A2 = 470.5 mm, A3 = 668 mm, H1 = 253 mm, H2 = 36 mm, J1 = 480 mm, L1 = 1008 mm, L2 = 605 mm. Both bearing positions are fitted with grease nipples, allowing relubrication of each seat during operation without dismantling the housing. The unit is supplied with seals, which protect both bearing positions from contamination along the shaft line. The twin-seat design of PDNI 319 keeps both bearing positions aligned on one shaft, which is the configuration indicated in the manufacturer catalogue for fan assemblies.