Fresh Filtered Air Unit Roof Supply Fan -18 inch

Specifications

Features

• All-welded full-mold body withstands the elevated torque and internal airflow forces generated by the 5 HP motor without housing deformation or impeller clearance loss
• Five-horsepower units installed above high-volume kitchens should specify the stainless steel housing to manage the heavier grease deposition rate associated with offsetting 8,400 CFM of exhaust air
• Five-HP axial configuration at 18 inches achieves 8,400 CFM by increasing rotational velocity beyond what the 2 HP variant reaches, while retaining the axial blade geometry that keeps airflow noise lower than scroll-type blower alternatives
• Pre-assembled housing ships ready for mounting — no on-site impeller balancing or blade pitch adjustment is required before first operation, reducing commissioning time on projects with tight mechanical completion schedules
• Direct duct integration at the 18-inch outlet eliminates the static pressure loss a transition fitting would impose at 8,400 CFM, where even small area changes produce measurable velocity pressure drops
• Chinese Energy Saving Label at the 5 HP rating confirms the 8,400 CFM output is achieved within the declared power consumption envelope at standard test conditions
• ISO 9001:2000 quality system at this motor class covers the complete production process including 5 HP motor specification compliance, terminal wiring verification, and dynamic impeller balancing prior to shipment

The 18-inch / 5 HP Fresh Filtered Air Unit moves 8,400 CFM — the highest output in this product line — engineered for large food courts, institutional cafeteria kitchens, and light industrial spaces where multiple exhaust systems collectively pull more than 7,500 CFM and continuous positive pressure must be maintained across the entire served footprint. The 5 HP motor requires three-phase power supply planning before installation; confirming panel capacity and breaker sizing for this motor class is a prerequisite of the design process.

At 8,400 CFM, this unit simultaneously offsets the exhaust from three commercial hoods each rated at 2,800 CFM, or from a single high-volume industrial exhaust system serving a food processing line. The direct inline 18-inch circular duct connection integrates the unit into existing 18-inch duct infrastructure without custom transitions, which is particularly valuable in renovation projects where existing ductwork must be preserved. The 2,950 CFM advantage over the 18-inch / 2 HP model (ID 1190) is achieved entirely through the motor step-up from 2 HP to 5 HP — the impeller diameter and duct connection size are identical between the two variants, meaning the 5 HP unit can be substituted in an existing 18-inch duct system without any ductwork modification.

This model is the correct selection only when the served space genuinely requires more than 6,000 CFM of supply air; operating it in applications sized for the 2 HP variant generates excess positive pressure that stresses door seals and increases HVAC conditioning load. When 5,450 CFM is sufficient, the Fresh Filtered Air Unit Roof Supply Fan – 18 in at 2 HP delivers that capacity at a fraction of the operating cost.

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