A90 series Inverter User Guide 2.3.2 Precautions Please take precautions during installation to prevent metal fragments or dusts produced by drilling or other actions from falling into inverter. Remove precaution objects after installation. 2.4 Installation Direction and Space Inverter must be installed in vertical direction with enough space maintained to an adjacent object or a baffle (wall) for better cooling effect (see Figure 2–2). A90-4T4R2B and above models are equipped with cooling fans to force air cooling. > Air outlet > > > > Air inlet Figure 2-2 Inverter Installation Direction and Space 13