Here thrust restrain for fans including , fan section , flexible duct connection , fan discharge , coil suction or discharge duct , vibrator isolation as schedule or specified thrust restraint Vibrato-Acoustics Thrust Restraint (HCS and AHCS) series provide resistance to horizontal motion due to thrust (for example, air pressure from a fan). Applied in pairs, the HCS/AHCS thrust restraints include spring isolation as well as mounting brackets for attachment to the equipment. for more details of Thrust restrain for fans download this file .