Super Low Sound Axial Propeller Fan(s)

Unit shall be provided with Super Low Sound Fan(s) in order to assure a maximum sound pressure level not to exceed __dB(A) measured 5 feet (1.5m) above the fan discharge cylinder during full speed operation.

Fans shall be high efficiency axial propeller type with non-corrosive FRP hub and blade construction. The one-piece molded heavy duty fan construction utilizes a forward swept blade design for superior sound quality. Each fan shall be statically balanced and installed in a closely fitted cowl with venturi air inlet for maximum fan efficiency. The fan cowl shall be covered with a heavy gauge hot dip galvanized (or Type 304 stainless) steel fan guard.

There shall be no performance derate when utilizing the Super Low Sound Fan.

Low Sound Axial Propeller Fan(s)

Unit shall be provided with Low Sound Fan(s) in order to assure a maximum sound pressure level not to exceed __dB(A) measured 5 feet (1.5m) above the fan discharge cylinder during full speed operation.

Fans shall be high efficiency axial propeller type with aluminum wide chord blade construction. Each fan shall be statically balanced and installed in a closely fitted cowl with venturi air inlet for maximum fan efficiency. The fan cowl shall be covered with a heavy gauge hot dip galvanized (or Type 304 stainless) steel fan guard.

There shall be no performance derate when utilizing the Low Sound Fan.

Fan Discharge Sound Attenuation

Unit shall be provided with a factory assembled straight-sided discharge sound attenuation package designed to reduce overall discharge sound levels. The discharge attenuator shall be supported entirely by the unit and shipped as an assembled section for easy mounting in the field. The attenuator shall be constructed of G-235/Z-725 galvanized (or Type 304 or 316 stainless) steel and includes insulated walls and baffles acoustically lined with high-density fiberglass. The discharge attenuator shall be covered by a heavy gauge hot dip galvanized (or Type 304 stainless) steel fan guard to prevent debris from entering the attenuator.

Water Silencers

Unit shall be provided with water silencers located in the falling water area of the cold water basin. The water silencers shall be constructed of lightweight PVC in easily handled sections for ease of removal and access to the basin area.