dia., Rough Opening Shape Round, Overall Diameter 8 in, Includes 110 V Spring Return Actuators, Switch Action Normally Closed Damper,Rnd,Sprg Ret,110V,Nrm Opn,8 In.
dia., Rough Opening Shape Round, Overall Diameter 6 in, Includes 110 V Spring Return Actuators, Switch Action Normally Open Damper,Rnd,Sprg Ret,110V,Nrm Cls,5 In..