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Dayton 12 inch roof supply fan aluminum housing four blades assembled

Dayton

Dayton 4YC91 12 in supply vent 929 cfm 115V 1/4 hp

SKU CH-PS8C-Z1ATX MPN 4YC91

Axial downblast roof supply fan delivers 929 cfm airflow with a 12 in blade diameter and 1/4 hp motor

  • TypeDrain Components
  • 12 in blade diameter delivers 929 cfm supply airflow
  • 1/4 hp open air-over motor runs on 115V single-phase power
  • Axial downblast design mounts directly on roof
  • Assembled unit with four aluminum blades ready to install
  • Operates up to 120 °F inlet temperature for demanding environments

Supply Vent Specifications

The Dayton 4YC91 is a 12 in supply vent rated for 929 cfm at 115V AC single phase. It uses a 1/4 hp open air over motor with a 120 degrees F maximum inlet air temperature. This assembled axial downblast roof fan suits commercial ventilation installations.

Airflow Capacity and Static Pressure

The unit delivers 929 cfm supply and exhaust airflow at .000 in SP with a maximum static pressure of 3/8 in wc. Four blades move air effectively in standard static pressure applications. It is not rated for high-static pressure systems or high-efficiency motor requirements.

Roof Mount Integration

Roof mounting location and aluminum housing integrate directly into roof curbs or penetrations. Assembled delivery removes field assembly steps. Single speed operation simplifies electrical wiring to a 115V supply. Motor enclosure requires open air over conditions for proper cooling.

Highlights

  • 12 in blade diameter delivers 929 cfm supply airflow
  • 1/4 hp open air-over motor runs on 115V single-phase power
  • Axial downblast design mounts directly on roof
  • Assembled unit with four aluminum blades ready to install
  • Operates up to 120 °F inlet temperature for demanding environments

Specifications

TypeDrain Components
BrandDayton
Model4YC91

Questions about this item

Will the 12 in blade diameter match my existing roof curb opening?

The fan has a 12 in blade diameter and is designed for roof mounting; verify your curb dimensions against the manufacturer's curb-cap drawing before ordering.

How can I confirm the unit is delivering the rated 929 cfm after installation?

Measure static pressure at the fan inlet with a manometer; at .000 in SP the fan should move 929 cfm — if pressure is higher, airflow will be lower.

Does the 115V 1/4 hp motor ship pre-wired with a disconnect or must I supply one?

The unit arrives assembled with an open air-over motor; a disconnect switch and wiring are not included and must be provided by the installer.

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