For PK720PK721PK731PK820:1. Can the + 2.696 stairs and platforms of PK720 PK721 be placed on the side of its dust outlet like pk820? The reason is that H720c / H721c affects the access to this stair. See Attachment 1 .As per the attachments Capture 1 and Capture 2, there’s enough space to install the stairs that don’t interfere with the screw conveyors. Being on the walkway, to raise the upper floors there’s a dedicated ladder. On the opposite side (where you would move the stairs, there’s an emergency ladder. We recommend to follow our design and don’t move the stairs.2. The drawing of D73cA000 (0.0) does not see the 2.6m stairs and platforms with pk731. Is this necessary? See Attachment 1 .Under the PK-731isn’t necessary any platform. It’s possible to reach the duct with a small stair and/or a scaffolding.3. The blowpipe in Attachment 2 is not seen in the drawing of PK720 PK721 PK731 PK820. Do we need the dust remover blowpipe? How to install? See Attachment 2.What mentioned by you is the cleaning system of the bags (attached for reference drawing D713E001 rev.0 for PK-720). How to install it is shown in the manual sent you (please refer to the letter C3544/034-lt on 31/03/2020). For your better reference, I’ve sent you separately with TRS n. 165 the full package of drawings for the installation of the cleaning system for each baghouse.