Guide Specs

SERIES 26 DIRECT DRIVE, UPBLAST, RECIRCULATING ROOF VENTILATOR SK-880-26 NOVEMBER, 1997

The Direct Drive, Upblast, Recirculating Roof Ventilator, shall be manufactured by Hartzell Fan, Inc.®, Series 26. Standard sizes are 24" through 60". This unit shall be equipped with a 100% reversible airfoil propeller and shall be able to provide either exhaust or recirculating modes of ventilation. The ventilator package shall include a windband and damper section, and a drop through the roof, recirculating section.

The windband shall be constructed of minimum 20 gauge galvanneal steel. Damper lids are constructed of galvanized steel as standard. Butterfly dampers open when the unit is on, in the exhaust mode, close weather-tight when the unit is off or in the recirculation mode.

The lower recirculating section (containing the fan and shutters, factory installed) is constructed of minimum 12 gauge hot rolled steel. Standard surface coating system shall be phosphatized surface preparation with an industrial grade air dry enamel paint. The recirculating shutters are back draft automatic shutters constructed of aluminum.

The reversible double orifice ring fan shall have a double airfoil design propeller, cast of 319 aluminum in compliance with Federal Specification QQ-A-601E and ASTM B26. The propeller shall be mounted in a high efficiency air seal fan orifice.

Propeller shall be retained on the motor shaft utilizing a split taper bushing or a clamp block arrangement.

Solid rolled rod motor mounts provide support for the motor. Motors shall be totally enclosed air over type.

The fan assembly shall be dynamically balanced at the Hartzell factory prior to shipping. Fans shall be balanced in accordance with AMCA Standard 204-96, fan application category BV-3 (comparable to Grade G6.3). Fans shall be manufactured in accordance with Hartzell's standard quality assurance procedures. Fan performance shall be based on tests conducted in Hartzell's AMCA accredited test laboratory and in accordance with the latest revision of AMCA Standard 210 for air performance and AMCA Standard 300 for sound.