... -adjustable blade,large air flow and high pressure SHT2 Portable Blower(16",20",24")1) Aluminum blade and metal frame2) ... a flexible soft duct, high pressure under long distance6) Suitable for underground, telecommunication, reparing tunnel project and so on ModelSize(mm ... SHT2-50404468x66x52120240290 SHT2-607880.592x83x5570140160 SHT2 Portable/Movable Axial Blower (16",20",24")