Permanently lubricated track system, upper and lower stainless steel ball bearings prevents metal-to-metal contact, encased to help prevent dirt, dust, sand and other foreign materials from damaging...

Permanently lubricated track system, upper and lower stainless steel ball bearings prevents metal-to-metal contact, encased to help prevent dirt, dust, sand and other foreign materials from damaging bearings for long life, less friction, smoother spin and wear resistance. Heavy-duty steel spider braces and case-hardened steel shaft for long-lasting strength/durability. Simple, mechanically-locked, two-piece head/base for faster, easier installation. Pre-punched bottom/crimped collar of...

Master Flow whole house fans are smart energy savers for any climate where cooling costs are a concern. They help beat the heat by forcing hot air out of the home while bringing in cooler outside...

Master Flow whole house fans are smart energy savers for any climate where cooling costs are a concern. They help beat the heat by forcing hot air out of the home while bringing in cooler outside air. Whole house fans are an important part of a complete home ventilation system."MASTERFLOW"Size In=30CFM=6,000BELT-DRIVE - DELUXE1/3 HP - 4-BLADEWITH AUTOMATIC SHUTTERUnit: EA

Master Flow Fan Shutter, Automatic, 42-1/2 in Length x 37-3/4 in Width Overall, 40-1/2 in Length x 35-7/8 in Width Opening, Aluminum, Enamel, White"MASTERFLOW"White Enamel FinishAUTOMATIC -...

Master Flow Fan Shutter, Automatic, 42-1/2 in Length x 37-3/4 in Width Overall, 40-1/2 in Length x 35-7/8 in Width Opening, Aluminum, Enamel, White"MASTERFLOW"White Enamel FinishAUTOMATIC - STANDARDUnit: EA

Master Flow whole house fans are smart energy savers for any climate where cooling costs are a concern. They help beat the heat by forcing hot air out of the home while bringing in cooler outside...

Master Flow whole house fans are smart energy savers for any climate where cooling costs are a concern. They help beat the heat by forcing hot air out of the home while bringing in cooler outside air. Whole house fans are an important part of a complete home ventilation system."MASTERFLOW"Size In=24CFM=4,500DIRECT-DRIVE - STANDARD1/4 HP - 3-BLADEWITH AUTOMATIC SHUTTERUnit: EA

Permanently lubricated track system, upper and lower stainless steel ball bearings prevents metal-to-metal contact, encased to help prevent dirt, dust, sand and other foreign materials from damaging...

Permanently lubricated track system, upper and lower stainless steel ball bearings prevents metal-to-metal contact, encased to help prevent dirt, dust, sand and other foreign materials from damaging bearings for long life, less friction, smoother spin and wear resistance. Heavy-duty steel spider braces and case-hardened steel shaft for long-lasting strength/durability. Simple, mechanically-locked, two-piece head/base for faster, easier installation. Pre-punched bottom/crimped collar of...

For attic ventilation. 26 ga."MASTER FLOW"Fits Pipe Dia In=10Base In=16 x 16GALVANIZED - GOOSE NECKUnit: EA

For attic ventilation. 26 ga."MASTER FLOW"Fits Pipe Dia In=10Base In=16 x 16GALVANIZED - GOOSE NECKUnit: EA

Automatic adjustable. Inline with vent. Outside arrow indicator for easy changes. Compatible with all single speed power vents. 4.4 A, 120 V, 60 Hz."GAF/MASTER FLOW" Unit: EA

Automatic adjustable. Inline with vent. Outside arrow indicator for easy changes. Compatible with all single speed power vents. 4.4 A, 120 V, 60 Hz."GAF/MASTER FLOW" Unit: EA