When ventilation and smoke‑control equipment is installed overhead after being embedded in pavement, the limit on embedded length is to prevent deformation caused by self‑weight, which would damage component surfaces. Hot‑dip galvanized air ducts adopt vertical‑column installation. Limited installation space brings difficulties for later maintenance.

Therefore, ventilation and smoke‑control equipment generally uses external galvanized angle steel flange connection to improve connection firmness and compression resistance. The flanges are arranged in a grid shape, and lifting lugs are welded on galvanized angle‑steel flanges for hoisting, without additional supporting parts.

For vertical installation of ventilation and smoke‑control equipment, glue shall be applied to tenon‑hole joints to enhance compression strength of connectors. Protective measures shall be taken during transportation to avoid equipment damage.

Laser‑cut end faces shall be sealed with adhesive tape or high‑strength glue before flange assembly to prevent leakage and loosening.

Ventilation openings ensure good indoor air circulation. Manufacturers produce equipment with various materials. Noise is a common problem for ventilation and smoke‑control units.

Noise generation follows physical principles: higher gas flow velocity produces louder noise. Regular inspection and maintenance of vulnerable parts can effectively reduce noise.

If original silencing performance is insufficient, additional silencers shall be equipped for air ducts. The equipment has high thermal conductivity without inherent heat‑insulating performance, so thermal insulation boards are required during application. It cannot be used in humid environments, otherwise the ventilation and smoke‑control equipment will suffer corrosion.