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Dayton vent blowers operate at high static pressures and are extremely reliable. They give plenty of power to move air down a long tube or from room to room. See our Blower Adaptors for intake and exhaust adaptors for all EcoPlus and Dayton Blowers. The Dayton 140 C.F.M. blower is great for small closet sized areas. Comes with a 4''x4'' exhaust. The Dayton 265 C.F.M. Blower comes with a 4'' x 6'' exhaust. The Dayton 465 C.F.M. Blower has a 4'' x 8'' rectangular exhaust. The 495 C.F.M. blower has a 4'' x 8'' rectangular exhaust. They all come ready to mount in place. These are quality American made blowers. 2 year warranty. When plants are grown indoors the natural balance that is present out of doors must be achieved indoors by way of fresh air ventilation or CO2 enrichment. Air exchange is necessary to help fight CO2 depletion and to cool your grow room down for best plant growth. There’s no more efficient way of exchanging air than with an exhaust blower. Heavy-duty Dayton blowers are quiet efficient and rated for continuous duty a must for all greenhouses and indoor growing spaces. Popular 'squirrel cage' fans technically known as shaded pole blowers quickly exhaust stale air out of hobby greenhouses and growrooms while bringing fresh clean air in. Mount securely to wall or ceiling. Quiet powerful performance; exclusive duct hose adapter flange; safety intake grill. UL and CSA Listed. Figure size needed for general room exhaust by taking cubic feet of room and dividing by 5. Fan with cubic feet per minute (CFM) rating just above the result will completely exhaust stale air in 5 minutes as recommended. Thus 265 cfm will completely exhaust stale air in a 1200 cu. ft. room in 5 minutes. Dayton