Although hollow-core slabs are made from hard, prestressed concrete that would normally favor wet drilling, using water can create significant problems. Water and slurry can enter the hollow cavities and emerge elsewhere, making containment and cleanup difficult. Since drilling is often performed overhead, wet drilling also creates additional inconvenience for the operator and can leave surrounding areas wet and messy. For these reasons, dry drilling is often the more practical solution. However, specialized coring motors and diamond core bits designed specifically for dry drilling reinforced concrete are essential. Traditional dry drilling equipment designed for brick and other softer masonry materials cannot handle the demands of drilling hard, reinforced concrete. Specialized motors use micro percussion (soft impact) technology to maintain diamond cutting performance, while effective vacuum extraction helps remove drilling dust and keep the diamond segments cool. For this application, AGP offers several suitable options: the DD160, DD62, and DM62 dry drilling motors, as well as the DDC5, DDC9, and DDC12 hybrid coring motors, which support both dry and wet drilling. The appropriate model depends on the required hole diameter and the specific application. The DD160 is particularly well suited to HVAC installations involving common air-conditioning openings in hollow-core slabs. Before drilling, always verify the slab layout and the positions of prestressing strands, and obtain the necessary engineering approval to ensure that the proposed openings will not compromise structural integrity.