Fresh Filtered Air Unit Roof Supply Fan – 18 in

Specifications

Features

• Structural integrity from full-mold, fully welded construction maintains dimensional tolerances around the 18-inch impeller throughout the service life, preventing blade-tip clearance drift
• Galvanized or stainless steel housing choice carries added importance at 18-inch scale, where a larger casing surface area accumulates grease film faster than smaller models above equivalent cooking operations
• At 18 inches, the axial impeller moves 5,450 CFM at a tip speed calibrated to keep airflow-generated noise below the threshold that would require acoustic attenuation lining in the connected duct system
• Despite the 18-inch duct diameter, the compact vertical housing height keeps the unit within reach of standard rooftop maintenance platforms without elevated access equipment
• Inline connection to 18-inch circular ductwork maintains the full duct velocity profile from rooftop inlet to terminal diffuser across the entire supply run
• Energy Saving Label certification at the 2 HP / 5,450 CFM duty point documents that the unit does not exceed its rated motor class power draw under normal operating conditions
• Manufacturing under ISO 9001:2000 includes documented motor mount torque verification — critical at 18-inch impeller sizes where imbalance forces are substantially greater than in the 10- and 12-inch models

The 18-inch / 2 HP Fresh Filtered Air Unit delivers 5,450 CFM, the right specification for large commercial kitchens, banquet facility preparation areas, and food processing spaces where exhaust volumes exceed 5,000 CFM and continuous make-up air is required to maintain indoor pressure balance. At 2 HP, it draws no more power than the 15-inch model while moving 750 CFM more, an efficiency gain achieved by increasing impeller diameter rather than motor power.

At 5,450 CFM, this unit can supply the full make-up air requirement for a commercial kitchen with four to five cooking stations running simultaneously under a Type I exhaust hood rated between 5,000 and 5,500 CFM. The ISO 9001:2000-governed production process covers documented motor mount torque verification at this size — a step that is not operationally significant for 10- or 12-inch models but becomes critical at 18 inches, where impeller imbalance forces transmitted through the motor mount can loosen the rooftop curb attachment points over time.

Within this five-model series, the 18-inch / 2 HP unit occupies the large-commercial tier: 750 CFM above the Fresh Filtered Air Unit Roof Supply Fan – 15 in and 2,950 CFM below the 18-inch / 5 HP variant. When the fresh air requirement exceeds 6,000 CFM and the electrical supply supports a 5 HP motor, the Fresh Filtered Air Unit Roof Supply Fan – 18 inch at 8,400 CFM is the correct next specification.

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