Tube Axial Fans with Variable Frequency Drives operate at temperature of up to 180 Degree F and pressure range of up to 12" PSIG. Tube Axial Fans are mainly used to exhaust the fumes and are designed with capacity range of 1200 CFM to 120000 CFM. Tube Axial Fans are available with variable frequency drives to facilitate ease of operation. Tube Axial Fans with Variable Frequency Drives can be piped in parallel for high air volume applications.